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Old 02-01-2013, 11:40 AM   #1
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Jeep whine

So today as I'm in te drive through of McDonald's I hear a whine coming from in front of me well after a while I figured out it was actually my jeep. It's got 144K on it now and around the serpentine belt it sounds like where the whine coming from. It happens just about all the time while the jeep is running even at idle and in park. So I've read a few things and I'm thinking the ididler pulley. Any help would be appreciated!

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Old 02-01-2013, 11:50 AM   #2
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So today as I'm in the drive through of McDonald's I hear a whine coming from in front of me.
Sounds like you ran over a Prius..

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Old 02-01-2013, 11:51 AM   #3
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Idler pulley, power steering pump.... maybe alternator or water pump
These are the things I would check first.
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Old 02-01-2013, 11:58 AM   #4
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Originally Posted by TJspeed

Sounds like you ran over a Prius..
Haha that's funny! I honestly thought it was the fusion in front of me
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Old 02-01-2013, 12:00 PM   #5
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If the power steering pump was bad would it wine when the wheel isn't in a turn?
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Old 02-01-2013, 01:15 PM   #6
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It could if the pulley wheel bearings are failing on it... same with any pulley wheel bearings within the serpentine system.
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Old 02-01-2013, 01:42 PM   #7
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As stated, idler/tensioner bearing, p/steering bearings, alternator bearings, water pump bearings, a/c compressor-clutch bearings to name a few.

Use the old mechanics trick to sort it out. Long long screwdriver, being careful of the moving fan and such. Touch the sharp end to an unmoving part as close to the suspect area as you can safely get. Like say the bolt in the center of the tensioner or idler pulley. Now then, place the dull end up against your ear. If you found the spot it will sound like someone just turned up the volume on it.

And yep a p/steering pump will whine even when you aren't making a turn, if it's going south on you.
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Old 02-01-2013, 01:47 PM   #8
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Easy. Pull belt. Check if any pulley has excessive play compared to the others. $10 says its the idler on the right about half way down.

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Old 02-01-2013, 01:47 PM   #9
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Quote:
Originally Posted by Shelby427 View Post

Use the old mechanics trick to sort it out. Long long screwdriver, being careful of the moving fan and such. Touch the sharp end to an unmoving part as close to the suspect area as you can safely get. Like say the bolt in the center of the tensioner or idler pulley. Now then, place the dull end up against your ear. If you found the spot it will sound like someone just turned up the volume on it.
Really good trick there.... scary but good.
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Old 02-01-2013, 02:17 PM   #10
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If the power steering pump was bad would it wine when the wheel isn't in a turn?
Chased a similar whine last year on my YJ. Did the screwdriver trick and borrowed a auto tech stethascope, couldn't find it. Started changing parts, both idelers, then the water pump, new belts. Last belt change, looked closer at the power steering pump pully. The pulley had a couple perpidicular cracks in it, very small in the belt grooves. Changed out the pulley on the pump, and all was good.
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Old 03-10-2013, 07:29 PM   #11
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This is good info. I have the same type of whine..or squeal or whistle. Really don't feel like paying someone a lot to fix it. I guess I'll try the screwdriver trick.
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Old 03-18-2013, 09:56 PM   #12
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Was the idler pulley. Broke off yesterday while driving. Replaced today. Good to go.
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Old 03-18-2013, 11:35 PM   #13
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Quote:
Originally Posted by Shelby427 View Post
As stated, idler/tensioner bearing, p/steering bearings, alternator bearings, water pump bearings, a/c compressor-clutch bearings to name a few.

Use the old mechanics trick to sort it out. Long long screwdriver, being careful of the moving fan and such. Touch the sharp end to an unmoving part as close to the suspect area as you can safely get. Like say the bolt in the center of the tensioner or idler pulley. Now then, place the dull end up against your ear. If you found the spot it will sound like someone just turned up the volume on it.

And yep a p/steering pump will whine even when you aren't making a turn, if it's going south on you.
That works OK, but a stethoscope works better.

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