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Unread 10-31-2008, 12:40 PM   #1
jerichof15s
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2003 WJ 
 
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Annoying Squealing noise under my hood!!!!

So i've got a 2003 JGC there's this squealing noise under my hood its been doing it for over a year now but only when it's COLD outside and above 40 mph. When I let off the gas its squeals really loud, and then I press the gas it stops. Only on some occasions I can get out pop the hood and catch it when its idle. I cleaned the entire intake it was really dirty and i changed my TPS (throttle position sensor) the only reason i changed that was because it was throwing a code and stalling on me. Well anyways i don't know if i've got a bearing out, pulleys or what? I've got an automatic tensioner on my jeep and you can't tighten it or any adjustments on it. So i don't know i'm just very frusterated with this entire noise. Also if i might have a bearing out how can i even tell there's ones going out? Thanks if anyone can help

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Unread 10-31-2008, 01:15 PM   #2
Kruzin
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What kind of shape is the belt in? That's obviously the first thing to check.
You could take the belt off to check the idler pully. Those do go bad (normal wear item).
These squeals aren't always on the front of the engine, though...
I had a nasty squeal on my 4.0 that only made noise when the engine was cold, and only at certain RPMs...turned out to be the bushing in the distributor.
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Unread 10-31-2008, 04:29 PM   #3
jerichof15s
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yeah i replaced the belt already and i still have the problem i also noticed today it was about 75 degrees out when i was driving it was doing it again and usually it'll just do it when its colder out like 30's to 50 degrees. if i pulled out the distributer could i be able to tell if it is worn out?
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Unread 10-31-2008, 08:56 PM   #4
steve L.
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you know i had the same problem, and all i did was tighten it up a little, and no more squeal. i dont know if that would help, but its worth a try.
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Unread 10-31-2008, 08:58 PM   #5
AgitatedPancake
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tighten what up? As he stated atleast the 4.7's have spring loaded tensioners.
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Unread 11-01-2008, 12:34 AM   #6
jerichof15s
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How would i know if an automatic belt tensioner is even going bad? it looks fine when its in idle.
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Unread 11-01-2008, 01:06 AM   #7
-Joe-
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Any chance it does not do it when you have the A/C on and does it when your A/C is off?

If so look at your a/c clutch, it can squeal like mad when bad and your a/c is off.
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Unread 11-01-2008, 09:32 AM   #8
jerichof15s
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yup i checked it and it does it off and on
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Unread 11-01-2008, 01:28 PM   #9
jerichof15s
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Does anyone think it may be a cracked exhaust manifold or gasket? i'm just throwing things out there that i think may do a whistling/squealing noise
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Unread 11-01-2008, 03:33 PM   #10
Merc1973
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Its the idler pulley/belt tensioner.......... very common to make noise when cold........
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Unread 04-21-2009, 10:13 AM   #11
weber22h
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answer to the squealing noise

I have a jeep sahara and i had the annoying squeal under my hood and i took it to two different mechanics and it ended up being a crack in my intake manifold.
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Unread 04-21-2009, 01:11 PM   #12
sdowney717
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I just replaced the idler pulley with a new bearing 4$
the idler pulley bearing is a 40 x17x12 MM a number 6203 sealed bearing.

Napa wanted 40$ for the pulley, autozone 16$, and I just bought the bearing 4$
at a bearing supply store. pop it out with a hammer and carefully put in the new one with a socket that presses across the whole face including the outer ring.

If you take off the serpentine belt and spin the pulleys, they should be quiet and smooth.
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Unread 08-18-2013, 06:59 PM   #13
SpecialK2000
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Idler pulley made need adjustment.

My jeep was doing the same thing. I went out there this morning....loosened up the idler pulley bolt, turned the adjustment screw clockwise brining the idler pulley towards the belt (i figured that would make the belt tighter).

No more squealing. It took no more than 5 minutes. Let's see how she sounds tomorrow morning.

Thanks everyone!
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Unread 08-18-2013, 08:01 PM   #14
coltman151
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holy old thread...
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