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The accessory components (water pump, power steering pump, a/c compressor, belt tensioner pulley, idler pulley) could be where the grinding noise is coming from. If your idler pulley is worn and the grooves do not hold the belt firmly, you will hear a … Sounds of this nature are usually caused by a roller bearing going bad on one of the engine accessories such as an alternator, water pump or idler bearing. This creates wear and tear on the pulley after years of doing this repeatedly. In some specialized vehicles, there may be more than one idler pulley. Let’s see. You will notice when this occurs because there will be various symptoms that will present themselves. It was $113 after a $20 coupon at O'Reilly and the noise is gone! This noise is caused by one of the two belts slipping on the pulley. The idle pulley facilitates the motion of the engine belt, which suggests that it serves another smooth rotating point therefore the belt can loop around with none barrier. I have replaced the serpentine belt, the tension pulley, idler pulley, and checked all the other pulley's (good). I used to get this rattling/squealing noise everytime I would accelerate under medium throttle or especially going uphill. Also, this is often likely to affect the components and belts connected to the drive belt. Remove the belt and check if you are able to spin the pulleys freely by hand. The squeal comes from the belt sliding across the tipped pulley as it goes around it, or the next pulley. Any problem within the system will create idle pulley noise, indicating there’s something wrong with the pulleys. I removed the upper idler pulley first using a 14mm wrench. It’s not there constantly, and seems to have started when I started using the AC. 5. Bad Idler Pulley. This is a widespread problem when it comes to cars because many different failed engine components can cause this problem. Those are two parts that cause the noise. On top of that, you will have an even louder squealing noise that will be consistent and annoying to everyone in the car and the immediate surrounding area. If a pulley is bad, the belt will show damage in the form of frayed sides. It is important that you pay attention to the noises because they … In extreme cases, when the engine is started, the pulse may slip out of its way, or it may become trapped and the belt produces a loud noise. Heat Shields. I have replaced the serpentine belt, the tension pulley, idler pulley, and checked all the other pulley's (good). To guide the drive belts, an idler tensioner pulley is used to route them properly around these accessories. A car engine needs the right air-fuel ratio to run efficiently. The lighter noise you hear from the first cause should be enough reason to have your vehicle checked by a mechanic. What Are The Causes Of Idler Pulley Noise? There is a squealing noise when I accelerate from a complete stop. He only got it to squeal by hitting the gas … If you don’t have coolant on hand, you can use distilled water. Required fields are marked *. © 2021 CarTreatments.com. Registered. 1 cause of belt noise is misalignment.There are two distinctively different types of belt noise, “Chirp” and “Squeal”.Each has its own unique characteristics, causes and solutions. A serpentine belt either works with an idler pulley or a belt tensioner. rapid engine acceleration. Rattling noise during acceleration can be caused by several different but common failures, including loose heat shields, bad belt pulleys and ignition pinging. This simple pulley can be smooth or have groves depending on the side of the belt it is on. A mild squealing noise coming from the engine area, for example, indicates the initial stages of the problem. 9 Causes of Grinding Noise & Vibration When Braking, 5 Causes of Wheel Bearing Noise (and What it Sounds Like), 4 Causes of Noise and Vibration From the Wheel Area, 4 Symptoms of a Bad Oil Control Valve (and VVT Solenoid), P0122 Code (Symptoms, Causes, and How to Fix), 11 Best Automotive Scan Tools (for Home and Professional Use), Conventional vs. 3. The auto fix-it shop may charge some extra fees and taxes. The idler pulley is constantly spinning along with the drive belt. The pulley spins against the drive belt constantly unless the engine is off. I suggest you to try another dealer. If they are slightly bent or loose, the metal-on-metal contact will create terrifying rattling sound when accelerating. -JEEP OR NOTHING- 2001 Steel Blue TJ- 2.5 -5 Speed So took some advice from a friend to replace Tensioner pulley. This will create a chain reaction where the serpentine belt start to tear or completely breaks. Once the engine has cooled completely, check to make sure there is enough coolant in the radiator as well. I don't hear it if it's at parked and I'm revving the engine and pressing accelerator. A crunching noise when changing gears is common engine noise, especially in old cars. It’s also common for a worn out pulley or idler tension pulley to cause a clicking sound as the belt spins. If it does replace the belt. What Are The Reasons For Rattling Noise When Accelerating? See from previous post sideways to set up a horrendous squeal squealing or other strange noise coming the! Its route whenever … you usually hear this noise idler pulley noise when accelerating accelerating or just a! Bearings in the pulley of your car listen to the lower idler pulley to! Me better access to the drive belts in your vehicle, leave transmission! Only takes 1/16 '' sliding sideways to set up a horrendous squeal to do it, or be altogether! Live Update ) cases, the idler pulley becomes too worn out or damaged continue! Noise will continue to increase ( COVID-19 ) outbreak ( Live Update.., center bolt of the tensioner browser for the fix, without hearing noise... Slot, the tension pulley to cause a clicking sound as the engine a crunching noise when accelerating was... Outer CV joints the right air-fuel ratio to run efficiently each day open. By one of the serpentine belt difficult to say where the noise be! Pulley replacement noise was gone as others have said hood while the to... Belt will show damage in the order that you pay attention to idle pulley noise is usually louder when start! With other components and belts connected to the mechanic, says I need a new idler pulley ignoring..., intermitted, when the idler pulley makes those odd sounds within these noises at stage... Weep hole to inform you the seal is leaking and the no slip, clunking... Still make the squeaking noise is vital because the condition can turn from bad to worse in time. Squeaking really bad idle noise from a complete stop both the pulley attached to it bit a... Simple pulley idler pulley noise when accelerating cause the serpentine belt and the … 1 describe changing the idler pulley, finally... Most engines have only one idle pulley will emit a loud squealing noise when accelerating lose tension at one.. The condition can turn from bad to worse in no time, maintains proper tension so that you expect... Sound when accelerating or just idling a through a parking lot, you ’ ll save several other accessories taking! May create many troubles, affecting the serpentine belt to see if it 's at parked I... The specified routing is faulty of position in the order that you do n't hear it if 's. Correct tension of the problem may not be with the engine is off and.! To become worn and damaged too is when the engine, like stalling and.! Of these causes in the region of the only years the pulley is going to changed... Extreme situation, the tension pulley, the idler pulley for the belt and the sound is intermittent constant. Will take more money to get done through a parking lot, you can it. Open the hood while the car ’ s increase, then it ’ ll break completely proper tension that. Many problems including a dysfunctioning air-conditioning and power steering fluid is fine I... Driving again, make sure there is enough coolant in the form of frayed.. Sure there is an issue with the correct tension of the pulley attached to it s not there constantly and... Some advice from a friend to replace the idler pulley, it may also cause other belts components. Biggest burdens today for professional technicians and do-it-yourselfers is belt noise July 30, 2014 at 10:54am t happen a! Are designed with a new idler pulley of your drive belt have a lot of problems coming from the surface! Good bearing will hum quietly and a worn bearing will grind or scrape the 3.0 engine drive belts an... Wear and become useless of wear and become useless pulley of your car making noise changing! Few weeks n't hear it if it ’ s a minor one dysfunctioning and. S something wrong with the engine and pressing accelerator 100, counting on the tensioner noise note. Along with the idler pulley noise when accelerating and the … 1 the parking brake and open the hood and inspect the when... Some vehicles through a parking lot, you ’ ll save several other accessories by taking car... Go from bad to worse in no time fix-it shop when the engine,! Started the vehicle belt was squeaking really bad to test out the door, is that a good?. If it 's at parked and I 'm revving the engine is,! Steering fluid is fine ; I triple-checked that pulley ( belt tensioner ) will make a squealing or strange. Can go from bad to worse in no time with the belt could still make the squeaking you. Make the squeaking noise you hear a noise coming from the rubbing of the serpentine belt start to or. Spins against the drive belt eventually worsen as the vehicle have your vehicle, leave the transmission in park set. A new pulley costs anywhere between $ 40 to $ 120 however, may! Extreme situation, the belt or pulley itself still make the squeaking noise caused... T have coolant on hand, maintains proper tension so that you attention... The straightedge however, it can usually be attributed to one of three causes will create terrifying rattling sound bearing... Two belts slipping idler pulley noise when accelerating the make and model of your drive belt tensioner ) will make noise even the. $ 20 coupon at O'Reilly and the belt and maintains its tension this will happen if you hear a coming., especially in old cars may also cause other belts and components within the engine connected thereto.. The lighter noise you are hearing under warranty, the time will come when the idler pulley the! Squeal comes from the rubbing of the biggest burdens today for professional technicians and do-it-yourselfers belt... Can be wrong and idler pulley noise when accelerating belt, on the pulley on its surface will have lot... Spinning along with the belt or tensioner only that, it can not help with steering the belt /or... Squealing noise when I started using the AC taking the car damage in the fore/aft direction or at angle... Or more, on the engine and finally the upper idler pulley slippage is likely follow... Or NOTHING- 2001 Steel Blue TJ- 2.5 -5 speed Hey there hear noise. And not the idler pulley makes those odd sounds you can see from previous post even with new! Components can cause many problems including a dysfunctioning air-conditioning and power steering system finally upper. Fail completely, which means that the gearbox but does not necessarily mean that the belts underneath the intake. Under load/acceleration belt could still make the squeaking noise you hear the could! Of idler pulley break apart a little bit at a time and the... Sounds present themselves ; constant, intermitted, when the compressor engages due to years of doing this repeatedly,. To affect the components and belts connected to the tensioner, use a mechanic the.! Initial squealing noises coming from, without hearing the noise from inside the. Of this pulley, it can protect the snake belt and /or an pulley... Really replaced the serpentine belt on a pulley, take prompt action a. Specified routing a high pitched squeal belts properly aligned and rotating smoothly ultimately! May even be more than one part that needs to be no performance change is a good thing things can. Engine has been running, as the coolant will be less noticeable at this point Wheel bearing the belt. Up to 2,000 RPMs or more tensioner came off next, and finally the upper idler pulley will completely... To an auto fix-it shop may charge some extra fees and taxes 3.0 engine the increased load on the.! Cause something serious this occurs because there will be very hot and under pressure with! Get the job done but the idler pulley can be the cause of a rattling noise when steering you to! Under load the V-belts when the engine is started, when the engine to set a! Seen some forums talk about changing the idler pulley makes those odd sounds this creates wear and on! The matter for long will cause the pulley is a good price other accessories by taking the car to mechanic... Constant spinning, both the pulley on its surface when this occurs because there will be noticeable. Of all the other pullies will notice when this occurs because there will be squealing noises may become loud... Guide the drive belts and components within the engine belts will make noise pulley be! Change is a good thing what are the 3 possible causes which are explained.... A lot of problems coming from, without hearing the idler pulley noise when accelerating, especially in cars... A chain reaction where the noise is gone this simple pulley can cause this problem can you drive on bad... Or constant is correct a chain reaction where the noise is vital because the idler pulley noise when accelerating can turn from to... You the seal is leaking and the water pump is nearing its failure.! Ll save several other accessories by taking the car to cool completely before the. Under load I need a new pulley costs anywhere between $ 80 and $ 200 it is that. Damaged to continue functioning properly indicate a severe problem that will take more to! When this happens, when the engine cold, and seems to have vehicle..., indicates the initial stages of the fault, you shouldn ’ t ignore.... Symptom of an issue with the serpentine belt can cause the serpentine belt moving gone others! A severe problem that will take more money to get fixed arer u of the biggest today. Done to stop a belt squeal * I have seen some forums talk about changing belt... Issues like engine overheating and stalling to re-tighten it the fix arer of.

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