Skip the auto shop - Our mechanics make house calls

Q: Squeal when engine starts or revs.

asked by on

So when we start the engine, there's a squeal, but it goes away when the engine idles. The squeal comes back when you rev it, but if you hold the revs steady, the squeal gets quieter. We've replaced the serpentine belt, tensioner pulley, and idler pulley and have replaced all fluids. Out of ideas on what else the problem could be. The truck drives fine; there's no odd vibrations or other sounds coming from the engine compartment, and no strange smells. So if you guys have any suggestions of what it could be, that would be greatly appreciated. If not, we'll just throw in a new one. Thanks!

My car has 250000 miles.
My car has a manual transmission.

With having already replaced the belt and the idler and tensioner, I would look at the components next. Something like the bearing or bushing going out in one of the other driven components. The alternator, the power steering pump, or the air conditioning compressor could have a bearing/bushing that is beginning to fail, and can cause a squealing sound like you have described. Also, if one of the pulleys has a "glazed" surface, it too can cause a squealing sound. When confronted with this type of issue, I would normally have a partner start the vehicle and try to replicate the issue while I would use a stethoscope to identify exactly where the squealing is coming from. If I didn’t have a stethoscope available, I would use a length of brake line, a piece of hose, or something similar, to isolate the sound to my ear. Obviously, you need to be very careful not to come into contact with any of the moving parts, but about anything hollow, and of adequate length, will suffice. If this is something you feel you could use a hand in identifying, or repairing, contact a certified mechanic, like those available at YourMechanic.com.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Converting

The body for these two models are different. The mounting locations for the the front header panel is going to be different on each one. You can try, but I do not think the parts will be interchangeable.

Q: How to fix squealing power steering

Hello....This could be a dry or worn out ball bearing assembly of which there are quite a few (alternator, A/C, idler pulleys, etc) or it could be a belt alignment, belt age, or belt tension issue. YourMechanic can isolate these...

Q: Water inlet tube broke on the manifold 2000 Ford F150

Hi there - yes, it is necessary to remove and repair/replace the lower portion of the intake manifold. The lower intake manifold is where the water inlet is located. For assistance, I recommend an lower intake manifold replacement service performed...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...