I have a 2.3L 2008 Ford Escape XLT that has a loud engine roar and a squeal in the engine that gets louder under acceleration. The squeal is not caused by the belt and the idler pulley has been replaced. The squeal is present when the serpentine belt is removed from the car.
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First you need to remove the drive belt and spin the Alternator, A/C Clutch and Water Pump pulley's and see if you hear the squeal. Its possibly it may have to be under a load before you hear it but its worth a try. It's also possible it could have something to o with the Throttle Body or Intake Manifold. Hope this helps and have an awesome day.
Use a mechanic's stethoscope to locate the culprit sqeal. Have a technician rev the engine, in order to produce the squeal. Lay the stethoscope tip utop the water pump, nearest the armature. Locate squeal in this fashion against the idler pulley(if applicable), the alternator, the air conditioner compressor, power steering pump (if applicable), the cam shafts (if applicable), and finally the crank. This will help isolate the location of the squeal.
Just for testing, a few seconds, will the vehicle start and run w/o the belt? Have a helper work the throttle, is the sound gone? If problem not the belt, check the belt driven accessory. Sometimes you can use a long metal rod of some kind, with belt on, one end of the rod touches accessory housing, the other end goes on that bone behind your ear, helps to magnify the sound. I guess you could use a mechanics stethoscope to do the same thing. Have helper work the throttle while you listen to each. Don't get tool or anything caught in belt. This is a serpentine belt, I haven't looked?
Maybe an accessory trying to freeze up or bad bearing? I can't think of anything else at the moment?
Hello, If you have not put on a Serpetine belt in some time, then your belt has probably stretched to the point where it does not grip the pulleys good. You can also have a weak Tensioner pulley as well.
You need to replace both the belt and the Tensioner pulley to keep the Alternator pulley tight so nothing loses its, grip. Sometimes you will not hear a squeal from the belt, and the dash light will flicker.
Find out which belt it is. You woud notice a glazed apperance on the pulley and the belt. It is best to replace it because once the belt is glazed it will likely do that even it you tighten it. You can try belt dressing but those are temporary.
There is a TSB (Technical Service Bulletin) for this problem:
Engine - Accessory Drive Belt Noise Diagnostics/Tool
This particular vehicle had an issue with pulley alignment, particularly the power steering pulley. Take a look at the shaft the pulley is pressed onto. If the end of the shaft isnt flush with the pulley, it is out of line and will cause a squeal.
It is recommended that you discuss this TSB with your dealer (not local mechanic).
there is nothing under the floor of the pedal will make that terrible squeak sound. have your belt check make sure they are tight and not slipping, it will also make that loud squeak sound if it slips. go to auto parts store and purchase a can of WD40 and spray it on all the pulley under the hood. have the engine off while spraying the pulleys. don't worry if it get on other parts of the engine. Common problems with pulleys squeaking on many vehicle.