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Can A Bad Belt Tensioner Cause Rough Idle

Next issue was rough idle. You can usually get away with replacing them with every other belt change, but they can fail and cause bent valves at inconvenient times; I had an idler fail without warning in the middle of a 500 mile trip. replaced spark plugs & 2 coils on #1 and #3 cylinders. If the surface of the idler pulley wears, or the pulley seizes or binds it may cause the engine belt to squeal as a result of it rubbing against the surface of the pulley. The grinding sound could be a tensioner pulley for the serpentine belt. An updated part is available which is supposed to minimize the problem. The cause of the misfire can be in any one of the following systems: Ignition System: In a nutshell, the ignition system on the 2. Alternatively, it could also be the tensioner pulley. Belt-driven accessories fail. Another symptom of bad or failing drive belt tensioner is failure of the belt driven accessories. When your serpentine belt is making squealing sounds, it is a good idea to inspect for the cause. In no particular order Noisy tickover, bouncing alternator drive belt From David Crook: Hi, I have a Renault Scenic 1. on most cars, that would include A/C, power steering, the alternator, the water pump, and various smog equipment. Okay, I've been reading since I got my WRX, about the rough idle issues. Other readings I was given on Idle this was outside and standing still for approx 2 mins at -3C outside temp, Fuel Trim short Term: 12. Turn the car on and turn the ac on. The issue is the chain tensioner…. Set engine speed to over 1,200 rpm (if noise is a VCT knock, the noise should disappear). Some common items include the serpentine/drive belt, water pump, drive/serpentine belt tensioner, camshaft seals, crankshaft seal, and valve cover gaskets. Chrysler recommends adjusting the belts on the older engines every 15,000 miles. It could possibly and eventually set a P0300 misfire fault code. Rough idle. Only about 1/4 of an inch, but it isn't running straight on the pulley. And don't forget to test the serpentine belt and belt tensioner/pulley. The air conditioning compressor is driven by a separate belt mounted low on the engine, behind the accessory belt, and has only an auto-tensioner. Having bad fuel injectors can cause bad mileage. I put them in and my car runs like new again. Switched to 89 midgrade, and she's a totally different truck. Your timing belt may have jumped a tooth or worse, your crank shaft may be broken. 2L 134hp in it. there was a noise that was created heard during cold start up and eventually went away when the engine got warm. Other readings I was given on Idle this was outside and standing still for approx 2 mins at -3C outside temp, Fuel Trim short Term: 12. If this reduces the noise, the cause is excessive clearance, and you’ll need to make the proper adjustments. Symptoms will be rough idle, misfires, poor acceleration, hesitation and stalling. When the a/c is on there's more stress on the tensioner that's why the noise gets louder. It does not harm the engine and can usually be heard only at idle so if yo can live with it, great. Any suggestions? Other than buying a new car. Rough hot idle; Cam bearing wear; All of this can be caused by 25 PSI? but random faults like a broken chain tensioner can also provide the raw material for a clog. My owner's manual states using gas with up to 10 percent ethanol is fine. That would cause a slight change in idle speed. In reality, this design meant that a defective timing chain tensioner can quickly lead chain failure, and finally even engine failure. Hi Brian, The Timing chain is used on the 3. but localized leaks can. Vibration at Idle Step 1 – Check your belt tensioner. These items are all important parts of what keeps a vehicle running. Here I am a few days later and I am still getting the problem on initial startup when the engine is warm. It will surge or "hunt" for the correct idle RPM. Stop and the idle was rough. The notches in a belt can cause noise. The grinding sound could be a tensioner pulley for the serpentine belt. If you vehicle is made after that date most likely you have an camshaft actuator or camshaft actuator solenoid problem. Mower Makes Unusual Noise · Freedom42: Check blade timing and adjust timing belt tension if necessary. As to the misfire, could it be the timing belt is installed a tooth or two off? Other than those 2 things a rough running engine at idle can be caused by a vacuum leak, low compression, faulty injector spray pattern, etc. First thing you need to do is isolate which system is squeaking. , plug wires injectors, timing belt, serptine belt, tensioner, fuel filter,temp sensor, cooling fan switch, but as soon. Both vehicles with a timing belt or a chain have a tensioning system to keep it snug and centered. This spring loaded pivot based part can wear allowing the belt to "bounce" as it loses and gains. A bad ISC motor will not cause a rough idle. Start car and rough idle. If a timing belt jumps, this can quickly take out the IAC. Turn the crankshaft 2 1/6 turns clockwise Verify the timing marks are still correctly aligned. What happens is the bearing overtime in the tensioner starts to fail and causes this issue. Engine whine diagnosed as failed belt tensioner/idler pulley. The idle of a car engine is kind of like a human heartbeat: You can tell what shape it's in just by listening. I replaced both coils with equal resitance, new wires new plugs like the dealership told me to do. This can lead to a rather loose pulley, unable to maintain the tension on the drive belt system so that the drive will not slacken. The exhaust sounds louder with the Jetchip in. This can be seen with a flashlight looking up from under the right front wheel well. A: Not fully engage and cause the belt to smoke B: Not fully disengage and cause the belt to smoke. Holy crap, I've had a rough and erratic idle on my 98 A4 1. A vacuum leak can be caused by a bad vacuum hose, intake manifold gasket, and other vacuum powered. So to summarize, I installed a new belt tensioner first and then the belt. It has a rough idle and shakes a lot. 5-liter V6 engines installed in various Hondas ® can make a knocking or ticking noise at idle and only when warm. That required me to redo my freshly-turned mounting stud. Can't tell it's running rough on the highway or off idle. Over time, the friction wears down these grooves, resulting in a loose fit. After driving a few miles to work, the idle got a. Unfortunately, we have noticed that Polaris built the RZR, RZR-S, and Ranger XP with an unreliable fuel pump. You're right to assume that something else going on. A serpentine belt tensioner is designed to keep the belt tight during the engine operation and also take up the slack as the belt naturally wears. If there is a belt tensioner I can't find it. If you have recently installed a new belt, check the tension by squeezing the belt with your fingers. Cleaning the throttle body will usually do a lot more than Seafoam. First, visually inspect the cam and crank sensors and their harnesses for damage. If the engine is idling rough, this will cause it to jump around a great deal. If the tensioner has no oil pressure, the belt will become loose and possibly disengage from the pulleys and/or break. When the a/c is on there's more stress on the tensioner that's why the noise gets louder. Here’s a great video on how to diagnose bad plug wires with a multimeter. 5-liter V6 engines installed in various Hondas ® can make a knocking or ticking noise at idle and only when warm. It could also be something REAL SERIOUS like a burnt valve, but start with the simple stuff first. The issue will eventually worsen as the pulley continues to. Bad timing can also cause. Using the "universal" hexagon (hex) nut type: Select a socket wrench, a combination or adjustable wrench and insert it over the pulley hex nut (you may need a "cheater pipe" to slip over the wrench. If the noise is coming from the tensioner, it is time to replace it. Sometimes a new belt is not needed. Don’t Overlook the Tensioner. Why does my car make a high pitched noise The drive belt is the one that drives power to the engine accessories , when the belt is worn out or damage high pitched engine noise is easily be heard especially the driver. Merc271 provides re-manufactured camshaft adjusters in which the original gear face has been removed and a high-tensile, surface hardened steel gear profile has been applied to make it significantly stronger. Any noise that sounds like a squealing, whirling, or chirping might be a sign that the tensioner is weakening. It gets worse when I turn on the AC. Also check that the belt/chain isn't stretched. Ok then it's one of two issues. Belts can become glazed on the inside drive surface which can cause them to slip, which produces the loud squeal. Can't tell it's running rough on the highway or off idle. The valve train seems louder since the work was done at the dealer. I replace the two part and the deck drive belt last much longer. 6 H6 and now the newer versions of the H4 starting with the 2012 Forester. There are a number of reasons why low oil pressure happens, and a car owner would be wise to keep them in mind. When your serpentine belt is making squealing sounds, it is a good idea to inspect for the cause. Since these are extremely hard to diagnose, it’s safer to flush and change your power steering fluid with fresh, manufacturer approved, power steering fluid. 1990-1992 Models 1993 Models Figure 8; Push the timing belt "B" tensioner up to place pressure on the timing belt so that the tension side is taut. Condition improved but not 100% : 200000 mi: Cold start o. What Is Causing My Car’s Squeaks, Creaks, and Clunks?. Remove the belt using a deep socket and a ratchet with a cheater bar for extra leverage on that “pulley bolt” and roll the spring loaded tensioner assembly counterclockwise and slip the belt off the pulley and rest it over. If you have access to a scope, check the cam and crank patterns. So to summarize, I installed a new belt tensioner first and then the belt. Then I started noticing a belt whine noise. Engine rattling when accelerating can be a symptom of a problem with this timing belt. The tensioner and the belt might need to be replaced. Watch the tensioner and see if it's bouncing around!. rek tech comments verify concern replace tensioner,pulley and belt details 8722533 e84 35. If you think you have a bad alternator you should either get it checked out for sure or replace it. But it isn’t good, the bits from the tensioner can be scattered around the engine. Or the pipe can simply rust off. Solution: Replace the tensioner. Mower Makes Unusual Noise · Freedom42: Check blade timing and adjust timing belt tension if necessary. If the engine stalls or the rpm's drop, your idle may be set incorrectly. If you can get to them I'd try that. It’s in danger of skipping a tooth – at best, performance suffers. Lack of power at low rpm. i flushed it a little under 1,000 miles after acquiring the car at around 94000 miles. Once you experience one or more of these symptoms, have a certified auto technician or mechanic inspect the timing belt and then replace it if necessary. If you have a tendancy to stall, try adjusting the idle speed to the maximum of the range or 900 RPM. Does anyone know what could be the cause of my hesitation and rough idle issues? I've been reading a couple of threads saying that the throttle position sensor can cause these symptoms. Low beams don't pulse. customer states serp belt tensioner is bad verified belt noise. · Blades are dull. It will also cause the tensioner to work harder and fail sooner. Some owners have disassembled the idle stabilizer and successfully cleaned them up. Auxiliary belt tensioner & idler bearings are starting to squeak so am replacing them but again, only £4-£10 for a bearing is peanuts. Many of us have had fault codes pop up on our screen while riding or while trying to start our bike. If your Miata is running unevenly, sometimes stalling, sometimes hesitating, there could be another problem. Check the serpentine belt and make sure that it is properly tensioned. However I noticed at idle speeds, stoplights etc. At idle, in gear and/or A/C running, it adds just enough reciprocating load to cause the belt tension to bounce slightly making the tensioner to bounce against the metal stop. Once you experience one or more of these symptoms, have a certified auto technician or mechanic inspect the timing belt and then replace it if necessary. You can usually get away with replacing them with every other belt change, but they can fail and cause bent valves at inconvenient times; I had an idler fail without warning in the middle of a 500 mile trip. This system automatically tensions the belt to the proper tension. This is the leading source of vacuum leaks on this engine. The RPM was around 1200 or so and the rough idle lasted about 10 seconds. There are many possible reasons that cause the engine to run rough and may result in engine misfiring but the most common. Some of the most common problems from overheating are: • An overheated cylinder head can crush the head gasket and restrict coolant flow to the cylinders. Replaced EGR. This issue seems to be even more evident when high performance upgrades are added. The timing tensioner can also go bad. But it isn’t good, the bits from the tensioner can be scattered around the engine. The bearing in the old tensioner was going bad which caused a different noise. The valve train seems louder since the work was done at the dealer. • Overheating can cause the camshaft to swell and then break. i flushed it a little under 1,000 miles after acquiring the car at around 94000 miles. Loose Rear Suspension Arms: In some 2006-2011 RAV4s, the rear tie rod adjusting lock nuts may not be tightened correctly after service, which can lead to thread damage or rust in the suspension arms. Vac leaks will cause a rough idle. Tech A notices a missing fan shroud and says that could be the cause of the problem. Some have said a squirt of coke will also work. Having your air conditioner on causes a lot of gas to be wasted in powering the system. But I think they make a smaller one with smaller bits for those jobs. A high pitched noise from the timing belt usually means the belt is too tight. A rough idle could simply be the result of an incorrect idle speed setting. First, visually inspect the cam and crank sensors and their harnesses for damage. A special tensioner tool is available if you don't have a short enough socket from your auto parts dealer. Some damage can’t be seen unless the tensioner has been removed. As the lower bolt for the serpentine belt tensioner broke off due to torquing it down so be careful while doing this. I didnt slacken the three injection pump pulley retaining bolts. Replaced the belt 4 times in the past month along with the following: Idle pulley Fan clutch Belt tensioner Power Steering pulley AC compressor, clutch (6 months ago) The belt still squeals! This is driving me crazy, the garage has no answer As soon as you get the belt wet (just a couple of drops of water) the squeal stops for 20-30 seconds. Sometimes a slow idle speed may feel like a rough idle and vice-versa. Car owners will often forget to their oil. What happens is the bearing overtime in the tensioner starts to fail and causes this issue. Expect to spend about $50 for a set of plug wires. Honda had problems with contacts inside the CDI units. The notches in a belt can cause noise. I also did the plug wires about 40,000 mile back. Worst part was the new belt had bends in it from where it was folded. could the timing belt be the cause maybe? my xt has close. The timing tensioner can also go bad. Never did a leak down. It can't hurt to try the Seafoam. He changed the timing belt, drive belts, water pump, pulleys, tensioner and a few hoses, and everything seemed to go off without a hitch. BMW E39 540i V8 6speed 210kW ex: AR 166 Super 3. The issue is the chain tensioner…. I replaced both coils with equal resitance, new wires new plugs like the dealership told me to do. Idle smooths out after a few minutes. If it does not reduce the noise, the sound may be caused by worn lifter faces or rough cams. 1 - Audi A4 Oil Leaks, Cam Chain Tensioner Gaskets and Seals. Slow down and the CEL stopped. A worn automatic serpentine belt tensioner can cause belt squeal, misalignment and belt chirp, and alterantor bearing damage. Once you experience one or more of these symptoms, have a certified auto technician or mechanic inspect the timing belt and then replace it if necessary. Cleared codes. Bad reeds can cause the motor to flood out, but I think the 400 is piston port. A mild engine cylinder misfire may cause a rough idle. Hesitation and slight rough idle? User Name: Replaced the bad belt tensioner. The repair must have taken place within 10 years / 100,000 miles of the vehicle delivery date. Also the idle Rpms are constant. Reinstalling the belt was a bitch needed another set of hands. I put them in and my car runs like new again. The new tensioner (P/N 3945527) is used for all ISC water pump options. The belt tensioner will jump around with every fluctuation in the engine so it moves around alot. Not really sure about voltage staying put after warm, honestly never messed with any on these cars. Setting a regular oil change maintenance schedule can serve as a benchmark for when other maintenance needs are to be met. yes ur belt can b worn or ur tensioner can b wornwhich can allow the belt to slip which in turn effects the water pump and the alternatorso electrical issues can cause rough idlealso water flow can cause car to go in and out of "limp mode" for overheating. Also replace it if the auger drive belt is so worn that it slips or squeals when you use the snowblower. 0-L engine can result in catastrophic damage when the chain jumps the timing Some VW Tiguan owners have paid $10,000 for replacement. Once you experience one or more of these symptoms, have a certified auto technician or mechanic inspect the timing belt and then replace it if necessary. Also, check the alternator and make sure that you can turn it freely after releasing the serpentine belt. • Overheating can cause the camshaft to swell and then break. We would recommend replacement of the belt and the tensioner. At idle, in gear and/or A/C running, it adds just enough reciprocating load to cause the belt tension to bounce slightly making the tensioner to bounce against the metal stop. Engine whine diagnosed as failed belt tensioner/idler pulley. Causes include worn, fouled or damaged spark plugs, bad plug wires or even a cracked distributor cap. I have a 2013 Sport that started idling rough this morning. For more information about that, check out our article about squealing engine belts. Spark plugs create the spark that is needed for your car to burn fuel. I had the head reconditioned and I reinstalled it. A: Not fully engage and cause the belt to smoke B: Not fully disengage and cause the belt to smoke. If there is a belt tensioner I can't find it. The belt tensioner will jump around with every fluctuation in the engine so it moves around alot. Spark plug/spark plug wires. Check your belts to ensure there is proper tension and the belts are not damaged. Do "not" cut the belt: Avoid such a "short cut", as that can cause the tensioner or where it attaches to be damaged when it springs back violently. 0 V6 24V 166kW ex: AR 156 2. Rough hot idle; Cam bearing wear; All of this can be caused by 25 PSI? but random faults like a broken chain tensioner can also provide the raw material for a clog. The squeaking, squealing and grinding noises can certainly get on your nerves, but the potential problems caused by a bad tensioner are far more than just casual annoyances. I removed belt quite easily. A weak cylinder, bad spark plug, poor injector, etc can also cause the truck to vibrate. There should be about a ¼” play for a properly tightened belt. BTW, the transmission mount on the drivers side is bad and one is on order. Remove the Belt. I have a 98 S-10 ZR2 with the 4. I took it to the dealership and they told me it was the #3 coil with weak spark. Some very simple test can be performed to check and see what part/s are giving you the problem, and all three are very easy replacement projects. Sensor performance diminishes with age, so we recommend replacement every hundred-thousand miles. The 2006 Dodge Dakota has 3 problems reported for rough idle. The alternator pulley is one of several devices driven by the serpentine belt (driven by the engine crankshaft), which also may include the AC compressor, the power steering pump, and the water pump. A damaged pulley can cause the drive or serpentine belt to dislodge. We really like the ride of the Polaris UTVs. ) The IAC or Idle Air Control Valve has built up some carbon on the place where it seals. When a standard trans style ECM is used with an Auto trans the engine may lope (run rough) at idle. This is the outboard belt of the two belt systems. As to the misfire, could it be the timing belt is installed a tooth or two off? Other than those 2 things a rough running engine at idle can be caused by a vacuum leak, low compression, faulty injector spray pattern, etc. However, any pulley wobble means it is cocked or has a bad bearing. By replacing your belt periodically, you can. For steel idlers, paint has worn off the belt tracking area - this is a normal condition and no corrective action is required. What about your serp belt, pulleys and tensioner? I didnt read through the whole post if that was already mentioned. Really feel I bought a wrong un now or it's just getting old and needs to be sold on. Here I am a few days later and I am still getting the problem on initial startup when the engine is warm. That can cause some very serious internal problems. There should be nothing electrical live under the hood post engine shutdown to cause a noise. Also replace it if the auger drive belt is so worn that it slips or squeals when you use the snowblower. The cause of the misfire can be in any one of the following systems: Ignition System: In a nutshell, the ignition system on the 2. This spring loaded pivot based part can wear allowing the belt to "bounce" as it loses and gains. The idler pulley only maintains tension on the serpentine belt. This condition may be caused by the exhaust camshaft coming out of time. What Is Causing My Car’s Squeaks, Creaks, and Clunks?. 9 DCI Diesel. This can be due to a worn out belt, a bad belt tensioner or a worn or frozen accessory pulley. Chains do not a service interval for replacement like a belt does, however if the wrong type of oil filter is used or the oil not changed and level maintained they can wear out and are very expensive to replace about 4 times what a timing cost to replace. Many system malfunctions can cause misfires or rough idling. What Is Causing My Car’s Squeaks, Creaks, and Clunks?. 0-L engine can result in catastrophic damage when the chain jumps the timing Some VW Tiguan owners have paid $10,000 for replacement. In no particular order Noisy tickover, bouncing alternator drive belt From David Crook: Hi, I have a Renault Scenic 1. This system automatically tensions the belt to the proper tension. Broken hoses and belts are bad; a damaged engine is even worse. I am a light DIY, Stuff like the hood insulation, brakes jobs, cooling fan housings, door locks, washer fluid assembly, shocks & struts, belt & tensioner replacement, etc. If the water has no affect on the sound, there is either a worn bearing in one of the idler or tensioner pulleys, one of the driven accessories is at fault, the outer surface of the belt is worn (see step-2) or the sound is not coming from the serpentine accessory drive system at all. *if equipped. The alternator pulley is one of several devices driven by the serpentine belt (driven by the engine crankshaft), which also may include the AC compressor, the power steering pump, and the water pump. However, the most common is an overstretched timing belt or chain, or a bad tensioner after miles of operation. In their Technical Service Bulletin No. If you can't get the belt around the tensioner pulley then your off a tooth and have too much slack in the belt. If there is a leak of some sort, then less fuel will make it to the engine, and then in turn make it run less efficiently. 9hrs at $80/hr, $72; Injector cleaner – approx. Still get a little rough idle every now and then. Do "not" cut the belt: Avoid such a "short cut", as that can cause the tensioner or where it attaches to be damaged when it springs back violently. Make sure that throttle body and ISCV are clean from soot and sludge, as well as MAF-sensor. Worst part was the new belt had bends in it from where it was folded. Check the ground wire going to the trans, they tend to corrode there and can cause rough idle and charge issues. 122k miles. BMW E39 540i V8 6speed 210kW ex: AR 166 Super 3. Watch the belt while the engine is running. As the belt/chain stretches through normal operation, it would get loose and fall off or jump. On the 944 Turbo and 944S the intake manifold must be removed to access the stabilizer: this can be expensive in terms of labor. A typical timing belt. The car has had an issue with vibration for some time now. Many problems may upset timing. Some damage can’t be seen unless the tensioner has been removed. When i drive it loses power and stutters when i try to accelerate. It runs rough at idle, and surges with power as the rpm increases. Engine idle issues can obviously involve a wide range of potential faults, involving ignition, fuel, vacuum and mechanical problems. a couple of days ago my '97 SC300 ran rough when I got back into the car after running an errand. In fact, the fuel pump is one of the main problems we see at our service and performance shop. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break. Another symptom of bad or failing drive belt tensioner is. BUTit will re-start again immediately. The tensioner pulley is like $20 and the idler is $35 so might as well start with the cheaper one. When this happens, the bimetal spring doesn't heat up quickly enough causing the choke to open too slowly. Rough running. Tension the belt Loosen the tensioner bolt to apply tension to the belt. As to the misfire, could it be the timing belt is installed a tooth or two off? Other than those 2 things a rough running engine at idle can be caused by a vacuum leak, low compression, faulty injector spray pattern, etc. Unfortunately, we have noticed that Polaris built the RZR, RZR-S, and Ranger XP with an unreliable fuel pump. Information on repairing your 2001-2004 F150 with the 4. Your timing belt may have jumped a tooth or worse, your crank shaft may be broken. If you get a car with a rough idle, poor shifting and code for misfires and lean conditions, check the vacuum line connections at the throttle body. Mower Makes Unusual Noise · Freedom42: Check blade timing and adjust timing belt tension if necessary. , plug wires injectors, timing belt, serptine belt, tensioner, fuel filter,temp sensor, cooling fan switch, but as soon. (new) or 120 lbs. If its a bouncing idle you should see the pulley freeze momentarily and then kick back on I have this in my car. I have no oil lose. 2 L engines. But when i check the timing now by setting the flywheel on the mark and inser. The alternator pulley is one of several devices driven by the serpentine belt (driven by the engine crankshaft), which also may include the AC compressor, the power steering pump, and the water pump. Is the idle bouncing? I could be a bad bearing or ac clutch in the compressor. Replaced timing belt, water pump, tensioner, idler pully (checked timing as well, is dead on) Replaced throttle body, no change. A trained mechanic can reset your idle speed setting easily. When the vibrating occurs, the increased angle should take away most of the vibration. Cleared codes. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Any suggestions? Other than buying a new car. Worst part was the new belt had bends in it from where it was folded. Some of the most common problems from overheating are: • An overheated cylinder head can crush the head gasket and restrict coolant flow to the cylinders. For more information about that, check out our article about squealing engine belts. It wouldn't work on say some of the smaller nuts from like a 9 or 8 mm on down. 4 can be tricky for someone to get in time if they aren't experienced with it. Located inside the engine, a chain is purported to last the life of the vehicle with no maintenance. Okay, I've been reading since I got my WRX, about the rough idle issues. Use the manufacturer-approved replacement part to replace the snowblower auger belt. This is primarily to make sure that the emission controls are working properly, but a rough idle can cause a malfunction code to be sent to the computer. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder. This can cause a rough idle can set diagnostic trouble code (DTC) P0300 and codes for lean and rich operation. The only things I have tried so far to fix the problem is change air filter, spark plugs and clean throttle body but none of these things have solved problem. I was misled by one video where they showed some side-to-side wiggle in this tensioner wheel and specifically stated that was the reason it was bad. If the 'Check Engine' indicator on your vehicle glows continuously, a possible cause may be a malfunction in the idle air control valve. Use a belt gauge to check and adjust the tension. Spark plug/spark plug wires. My 2009 Accent has recently been idling rough. Belt installed backwards (30 Series Only - Flat side goes towards engine) 2. it's. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break. Watch the belt while the engine is running. Fix: I replaced the EGR valve. I also did the plug wires about 40,000 mile back. 6 : Volvo:D6 Series: Failed Idle Roller: frode : 13 : 1 : 11-Sep-16 Reply: frode : 23-Jul-16 : Hi Tim, Volvo have released upgraded tensioner and rollers in metal, you need two rollers and one tensioner for every engine, remember to change the bolts on the tensioner since the new one have longer bolts for attaching the belt covers. After picking up the car, though, we noticed that the idle seemed much rougher than it had in the past. Cause: Failure of a primary or secondary timing chain tensioner. What’s more, the parts it controls can become severely damaged. Misaligned pulleys usually cause belt noise at idle that gradually goes away with increased engine speed. Maybe the rough idling would also be a concequence of the coil pack. replaced belt and bearing. Belt-driven accessories fail. I have a constant screaming noise coming from the area of the power steering pump and accessory tensioner. *Without Air Con 1290 + 5 mm The belt is fitted with an self adjusting belt tensioner which should ensure the correct amount of tension is applied to the belt at all times. • Overheating can cause the camshaft to swell and then break. I'll do the old long screw driver to the ear on the water pump and Opti and see if those are what are making the noise and I'll slip the belt off and test all the accessory pulleys and and let you know. 0 TDI engines including codes, common faults and issues on the VAG group 2. Lack of power at low rpm. 2006 Dodgr Stratus SXT Timing Belt Replaced - Rough Idle My car has 103000 miles on it and the timing belt was replaced several hundred miles ago. A bad bearing in the alternator also can cause a similar noise. Some people change timing chains when doing cam upgrades but it is very rare for LS timing chains to snap. Check your belts to ensure there is proper tension and the belts are not damaged. This WheelZine article tries to list down the possible signs and symptoms of a bad idle air control valve. It could possibly and eventually set a P0300 misfire fault code. The new tensioner (P/N 3945527) is used for all ISC water pump options. it seems overly rough. At worst, changes to engine timing can cause the pistons and valves to collide – such engine damage is extremely serious. Volkswagen / Audi capitulated to a Class Action Suit for those who had to replace tensioners, and/or chains, or had to repair an engine after damage was caused by a failed tensioner. I didnt slacken the three injection pump pulley retaining bolts. You're right to assume that something else going on. It will surge or "hunt" for the correct idle RPM. -my first Subaru- The #3 exhaust valve burned out. A bad pulley can cause slippage or misalignment. I thought maybe bad gas. Use the manufacturer-approved replacement part to replace the snowblower auger belt. But I think they make a smaller one with smaller bits for those jobs. Check engine light was on and kept flashing/beeping while driving. Now, at idle, the RPM'swill drop, there will be a screaching noise from the pully area and the engine will die. Hi there First of all sorry my poor English I recently replaced the timing belt incl tensioner on my 200tdi defender. Instead of using a belt that needs periodic replacement like many cars do, the Mini employed a metal timing chain. If you have a belt noise or vibration and you’ve changed the belt, it’s time to test your belt tensioner. Worst part was the new belt had bends in it from where it was folded. The other day, it started making a little bit different sound, and I came to the realization that the problem is actually the alternator bearings. If this is the. The pulley bearings should be ruled out first because loose bearings can also cause such a noise. The issue is the chain tensioner…. It started to get very noisy on tick over and the alternator drive belt was bouncing violently on tick over, I researched this for some time on the internet and found conflicting results, two mainly, the first one being a faulty belt tensioner and the other was. Another symptom of bad or failing drive belt tensioner is failure of the belt driven accessories. SOURCE: Can a bad idler pulley on a 1997 saturn with a 1. A typical timing belt. Serpentine belt squeal on a car can be fixed by sandpapering the pulleys and tensioner. Idle speed would dip down to 500 RPM then cause a good shudder. Lack of power at low rpm. That lets the stock tensioner rotate just a little, and takes a lot of tension off the belt. The valve train seems louder since the work was done at the dealer. A belt that is too long (just an inch or less) may slip, make noise and wear prematurely. At normal speeds it wasn't rough but power slightly low. Often the cause is misdiagnosed as a belt problem, when in reality the tensioner should be replaced. At times, the bearings in the tensioner pulley become worn. Information on repairing your 2001-2004 F150 with the 4. If a timing belt jumps, this can quickly take out the IAC. It could also be something REAL SERIOUS like a burnt valve, but start with the simple stuff first. Appearance/Worn Pulley. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Set the engine to TDC cylinder one. It’s on the serpentine belt side of the motor. For the flat poly V-belt, set the tension to 190 lbs. Expect to spend about $50 for a set of plug wires. Symptoms of a Bad Idle Air Control Valve. You can narrow the problem down to the belt if the noise stops temporarily when you spray water on the spinning belt, according to the You. The RPM was around 1200 or so and the rough idle lasted about 10 seconds. Each belt has its own separate tensioner pulley. There are a number of reasons why low oil pressure happens, and a car owner would be wise to keep them in mind. As a owner you can also retrieve these codes as I've shown in the video below. An updated part is available which is supposed to minimize the problem. If doing a valve adjustment you would rotate the crankshaft back (counter clockwise) about 15 degrees to go down into the liners so the cams could move independently and not contact the pistons. We really like the ride of the Polaris UTVs. In no particular order Noisy tickover, bouncing alternator drive belt From David Crook: Hi, I have a Renault Scenic 1. If the timing is off between the cams then it will cause a rough idle but will run fine while driving just like you are having. NOTE: Do not remove any of the hoses. Comparing the results to online guides or included instruction sheet should let you know whether your valve timing is off or ok. The metal-on-rubber friction heats up the belt, quickly wearing it out. 4 can be tricky for someone to get in time if they aren't experienced with it. $50 Total cost of repair – $202 4. A serpentine belt tensioner is designed to keep the belt tight during the engine operation and also take up the slack as the belt naturally wears. On the freeway at speeds over about 80 the check engine light would flash only. So do the job right and rough up the pulleys AND replace the belt at the same time. A bad pulley can cause slippage or misalignment. rough running at idle if you can verify your fuel pressure is good, points to an air issue or a wear parts failure like mounts. No check engine light. My 1994 Ford F-250 with a 5. If you can't get the belt around the tensioner pulley then your off a tooth and have too much slack in the belt. Lack of power at low rpm. X303-68 of February 2005, titled “Rattle From Engine on Start-up and Idle,” Jaguar states: This Technical Bulletin has been issued to address customer concerns of a rattle emanating from the engine on start-up and idle. Setting a regular oil change maintenance schedule can serve as a benchmark for when other maintenance needs are to be met. Would a bad serpentine belt cause bogging and rough driving when gas is applied? (2007 Dodge Nitro) When I purchased my used Nitro, it had a bad tensioner arm. For the same reason, cooling fans have unequally spaced blades and tires have unequally spaced tread patterns. The only things I have tried so far to fix the problem is change air filter, spark plugs and clean throttle body but none of these things have solved problem. Balance Shafts. About two weeks ago, I started to notice the engine stumbling a bit when I'd come to a stop. but the tensioner's marks don't lin up There are 3 marks on the tensioner unit, and it' lined up to the mark on the left, instead of the middle. Install new timing belt "B" over crankshaft sprocket "B", around the tensioner pulley, and over the silent shaft sprocket. A faulty O2 sensor, may cause a rough idle, but isn’t a big safety concern. Many of the engine s accessories such as the alternator water pump and AC compressor can be belt driven. A new timing belt cover P/N 21360-38214-D that incorporates a timing belt guide has been installed on vehicles produced since January 30, 2001. My money is on an bad belt tensioner. Comparing the results to online guides or included instruction sheet should let you know whether your valve timing is off or ok. If it does not reduce the noise, the sound may be caused by worn lifter faces or rough cams. The drive belt tensioner pulley is the lower one that's out of line with the rest of the pulleys. 9 harnish lincoln-mercury 35537 01-oct-07 2l1z 3c084 aa 18274703 customer comments customer states right front axle seal is leaking. The AC belt system consists of the compressor, harmonic balancer, idler pulley, belt auto tensioner pulley. Pop the hood and look at the serp belt. If a timing belt jumps, this can quickly take out the IAC. One thing is different, the timing belt can make a whirring or whining noise when it rubs against the belt cover. Causes include worn, fouled or damaged spark plugs, bad plug wires or even a cracked distributor cap. Car owners will often forget to their oil. Although the water pump in most vehicles will last a long time, they are by no means indestructible. A cam that was a tooth off would cause a rough idle but then so can a dirty throttle body. If you hear an annoying squeak from the front of the engine when the car is cold, its the timing belt tensioner. , plug wires injectors, timing belt, serptine belt, tensioner, fuel filter,temp sensor, cooling fan switch, but as soon. A healthy reading. Also replace it if the auger drive belt is so worn that it slips or squeals when you use the snowblower. customer states serp belt tensioner is bad verified belt noise. Thanks Sluggie24. 0hr at $80/hr, $80; Injector cleaning – 0. Put the timing belt back on the vehicle, clean all the areas that the belt touches so there is no oil, grease, or anti freeze any where, remember to line up the installation marks that the belt has. Symptoms of bad spark plug wires include a rough idle, a noticeable drop in engine performance, and lower gas mileage. ALWAYS replace the idlers and tensioner when replacing the belt. Many system malfunctions can cause misfires or rough idling. For the A/C compressor V-belt, set the tension to 160 lbs. Switched to 89 midgrade, and she's a totally different truck. Subaru - Outback :: Rough Idle And Lots Of Vibration After A Timing Belt Change Jan 14, 2014. Starting, car starts right up and jumps to 2k rpms or whatever when starting, and when its settling back down sometimes it will just die, otherwise idle will drop extremely low to the point of it not registering on the tach, and then idle back up. Common causes are defects in the opening or sealing of the intake or exhaust valve, worn or broken piston rings, or a blown head gasket. The bearings on these can start making noise, also. The result is a rich fuel condition resulting in a rough idle, excessive fuel consumption and high emissions. Additionally, if the camshafts don’t have enough to operate properly, they will lock up, which can cause the timing belt to break. well i recently bought the car. This can be due to a worn out belt, a bad belt tensioner or a worn or frozen accessory pulley. Pulley bearing wear. For more information about that, check out our article about squealing engine belts. On most vehicles, these parts include the alternator, water pump, power steering, air conditioning system, and different exhaust components. Now the engine runs rough at idle and I can't seem to get it to hold 650to750 idle without holding the throttle control on the TBI. Also the idle Rpms are constant. I have no idea how that could cause this issue. Spark plugs provide the spark that ignites the air and fuel mixture within the cylinders. Engine idle set too high 7. Belt riding seems to be linked to a belt tensioner failing. If you have access to a scope, check the cam and crank patterns. Quick test with WD-40 if noise goes away will show if it's the belt or more. 0 V6 24V 166kW ex: AR 156 2. • Rough idle. At times, the bearings in the tensioner pulley become worn. One thing is different, the timing belt can make a whirring or whining noise when it rubs against the belt cover. It sounds like the cam timing is off. At normal speeds it wasn't rough but power slightly low. However I noticed at idle speeds, stoplights etc. Sensor performance diminishes with age, so we recommend replacement every hundred-thousand miles. The belt is kept tight through the belt tensioner. There is not enough oil in the automobile. Here’s a great video on how to diagnose bad plug wires with a multimeter. Problem is, I purchased it from a Nissan dealership that apparently doesn't know anything about Dodge!. If you have a belt noise or vibration and you’ve changed the belt, it’s time to test your belt tensioner. Alternatively, it could also be the tensioner pulley. I pulled the Jetchip out, and it still throughs the same code. First thing you need to do is isolate which system is squeaking. but the tensioner's marks don't lin up There are 3 marks on the tensioner unit, and it' lined up to the mark on the left, instead of the middle. New plugs,cap, rotor ICM,wires. CARspec now offers walnut shell blasting of the intake valves to help prevent this issue! 2006+ IS250 and GS300 owners are frequently concerned over a rough idle, especially after sustained freeway driving, or a check engine light with codes P0301, P0302, P0303, P0304, P0305, and/or P0306 (misfire codes). Use a belt gauge to check and adjust the tension. replaced spark plugs & 2 coils on #1 and #3 cylinders. Instead of using a belt that needs periodic replacement like many cars do, the Mini employed a metal timing chain. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break. replaced belt and bearing. Your Jetta’s engine creates vacuum when running. Another area of concern is the PCV valve on 4. I will purchase a new belt as it seems too loose for me. However, any pulley wobble means it is cocked or has a bad bearing. So I ignored it. Remove the belt using a deep socket and a ratchet with a cheater bar for extra leverage on that “pulley bolt” and roll the spring loaded tensioner assembly counterclockwise and slip the belt off the pulley and rest it over. If the belt is too tight or something is misaligned or not installed properly, it. I have no oil lose. At times, the bearings in the tensioner pulley become worn. Ok then it's one of two issues. But, that in and of itself wouldn’t be too bad, but what can happen if this is not taken care of is. Definitely worth it for the extra $3 per fill-up. These items are all important parts of what keeps a vehicle running. I thought maybe bad gas. Setting a regular oil change maintenance schedule can serve as a benchmark for when other maintenance needs are to be met. When the RPM'sdrop and the noise comes, I can see the belt tensioner move back and forth. I also did the plug wires about 40,000 mile back. I removed belt quite easily. *Without Air Con 1290 + 5 mm The belt is fitted with an self adjusting belt tensioner which should ensure the correct amount of tension is applied to the belt at all times. Engine idle set too high 7. but localized leaks can. If the timing belt or chain tensioner loses its strength, the belt/chain has more movement than it should have. Automatic Choke: Make sure the automatic choke is working properly (wire to the coil attached, choke properly adjusted and opens the butterfly valve in the top of the carburetor as the engine warms up). It is also possible that the middle groove on the idler pulley has grown wider. Doesn't run bad on it, just not great. But if they do it can cause a lot of damage. it's. Then loosen the locknut under the tensioner bolt for the a/c belt, loosen the bolt on the pulley, so it can slide. Pulley bearing wear. This can cause a rough idle can set diagnostic trouble code (DTC) P0300 and codes for lean and rich operation. We really like the ride of the Polaris UTVs. Another cause of poor idle is exhaust gas recirculating back into your intake. Once you experience one or more of these symptoms, have a certified auto technician or mechanic inspect the timing belt and then replace it if necessary. Most of the time when a lawn mower won't start the cause is a problem with the gas or the lawn mower carburetor. Watch the tensioner and see if it's bouncing around!. The 2006 Dodge Dakota has 3 problems reported for rough idle. BMW E39 540i V8 6speed 210kW ex: AR 166 Super 3. The issue is the chain tensioner…. Quick test with WD-40 if noise goes away will show if it's the belt or more. By replacing your belt periodically, you can. Belt installed backwards (30 Series Only - Flat side goes towards engine) 2. Volkswagen / Audi capitulated to a Class Action Suit for those who had to replace tensioners, and/or chains, or had to repair an engine after damage was caused by a failed tensioner. If the vacuum system gets a leak, it will cause a shake when idle. 0L SOHC V6 is not exactly a high output engine. Having your air conditioner on causes a lot of gas to be wasted in powering the system. The drive belt tensioner pulley is the lower one that's out of line with the rest of the pulleys. Misaligned pulleys usually cause belt noise at idle that gradually goes away with increased engine speed. If you can get to them I'd try that. I noticed the serpentine belt on the tensioner pulley was running off slightly on the back side of the pulley. If it is not tight enough, or worn it is not able to run as smoothly as needed to keep the engine running smooth. This is the outboard belt of the two belt systems. We include the PD and newer CR engines in this guide and provide tuning tips and suggestions on how to improve your car. Bad reeds can cause the motor to flood out, but I think the 400 is piston port. Now put the No. 9hrs at $80/hr, $72; Injector cleaner – approx. this can be done by releasing tension on the drive belt tensioner and removing the serpentine belt. Really feel I bought a wrong un now or it's just getting old and needs to be sold on. A worn automatic serpentine belt tensioner can cause belt squeal, misalignment and belt chirp, and alterantor bearing damage. If you are ordering this part, chances are your engine makes a clattering noise with the A/C on and may also snap the A/C serpentine belt. but localized leaks can. Automatic tensioners tend to wear out at around 100K miles. (Please see our articles on tuning One-Screw Carburetors and Two-Screw Carburetors. There could be water on the belt, which isn’t such a big deal, especially if it’s raining at the time. There should be about a ¼” play for a properly tightened belt. If there is a leak of some sort, then less fuel will make it to the engine, and then in turn make it run less efficiently. Could be a bad motor mount or trans mount. Starting, car starts right up and jumps to 2k rpms or whatever when starting, and when its settling back down sometimes it will just die, otherwise idle will drop extremely low to the point of it not registering on the tach, and then idle back up. Generally, this indicates that the tensioner or idler is not attached to the mounting location on the engine correctly or the bearings for the tensioner, idler or both, have worn and have excess “play”. You can usually get away with replacing them with every other belt change, but they can fail and cause bent valves at inconvenient times; I had an idler fail without warning in the middle of a 500 mile trip. If your Miata is running unevenly, sometimes stalling, sometimes hesitating, there could be another problem. I have a 2003 chevy impala i started it this morning and it was shaky with a rough idle and flashing check engine light. There are a few other things that can cause serpentine belt noise tho so before you replace the belt check the following:-The bearings in the tensioner and idler pulleys can go bad. The metal-on-rubber friction heats up the belt, quickly wearing it out. A burnt valve will cause issues with your vehicle’s performance and fuel consumption. A failing belt tensioner can cause a lot of problems in your vehicle. A Ford Ranger example is seen here. if the squeak goes. I can also kind of feel the same frequency vibration when I turn the car to the left. If the engine is idling rough, this will cause it to jump around a great deal. For steel idlers, paint has worn off the belt tracking area - this is a normal condition and no corrective action is required. Is the idle bouncing? I could be a bad bearing or ac clutch in the compressor. The other issue is a problem with the compressor clutch and coil. If the belt has no give, it is too tight and may cause a loud squeaky noise and overload the motor. That lets the stock tensioner rotate just a little, and takes a lot of tension off the belt. My wife and I recently bought a 2005 Subaru Outback 2.