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Old 02-01-2013, 06:38 PM   #31
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the pulley in your pic (stationary pulley) is easy to change, if you have to change the tensioner pulley, its a little tricky. You have to line up the tensioner bolt housing and the pulley bolt when putting it back together.

these are the bolts that you need to get to in the diagram

the pic of the broken bolt (dont do lol) is the tension bolt and the square part is the housing the pulley bolt goes into. its behind the metal frame the pulley is on

you can see it if you climb under your jeep behind the front driver side tire.
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Old 02-03-2013, 06:46 PM   #32
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Take your belt off and start the engine and see if it still squeaks. If it does then it's something in your engine and not a pulley.

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Old 02-06-2013, 08:34 PM   #33
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I'm having a similar issue. When the engine is all the way warmed up (210 deg) there is a horrible squealing sound when I come to a stop. As soon as I get over 5 mph the squeal stops. Even if I'm stopped and I rev the engine the squeal persists, only when I begin driving does the squeal stop. Is this a pulley issue?
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Old 06-07-2015, 08:43 PM   #34
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Sorry to revive such on old thread but did u ever solve it. Mine is doing almost exact as the OP
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Old 08-10-2015, 06:48 AM   #35
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Same. Exact. Problem. As OP. If it's not exactly as he describes then it's not the same whistle... Any update or solution to this problem?!
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Old 09-28-2015, 11:26 AM   #36
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Same problem as OP

Same exact issue as OP. Squealing on gas pedal accel until about 20-30mph. Just started 4 days ago and very loud high pitch. Only have 34k miles but been rough on the accelerator. Automatic. JK 2012 Sahara 2dr. I am not someone that can do the work myself, so would like guidance before taking to a shop. Thank you.
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Old 01-20-2017, 06:29 PM   #37
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Airbox noise

98 jeep tj 4.0 112,000 miles all original has a loud low tone whistle coming from the airbox. When i hold my hand over the inlet it stops, but of course im just blocking off all the air. Any ideas why it would be doing this and how to fix. very annoying hard to hear all the other noises. lol
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Old 01-29-2017, 12:12 PM   #38
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As others have said, it is definitely a vacuum leak. The question is where. Mine was unfortunately complicated. I replaced the exhaust manifold bought from NAPA (can't remember the manufacturer). As you'll see, the intake and exhaust share the same bolts and require that the manifolds fit together nicely.

Well.. in my case the exhaust manifold was casted poorly and did not fit exactly well with my intake manifold which meant the bolts did not fully pull up the intake to the head causing a vacuum leak. I had to modify the exhaust manifold to fit properly (using a grinder) which ultimately lead to me taking them both to a machine shop. I was able to get the noise to go away from my own hobo modification, but I wanted to fix it permanently so thats why I took them in. I've found that those casting are frequently sloppy which is resulting in poor pull-up to the head. If your previous owner replaced the exhaust manifold (which is a common replacement) this is very likely the problem.

As others have said, spraying the intake gasket with starter fluid while at idle will cause it to temporarily increase in RPM. Dead give away. Its not a ton of work once you know where the problem, but still a pain.
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Old 02-09-2017, 03:43 PM   #39
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225k on a 97 2.5L have the same issue, but not constant. Squeal/whine will come and go - no relation it appears to heat or cold. Issue can happen either with engine cold or totally warmed up. Most obvious when it starts at a red light or something, but the first time I noticed it was on it's maiden voyage to the woods. Mostly highway driving there 70-75 MPH would start making the noise around 3k RPM or 65 mph. Downshifting into higher RPM's or coasting to lower RPM's seemed to stop it. After that the sound would come and go seemingly at random. Checked my pulleys and had a totally gunked up idler, cleaned that shiny and smooth, checked/tightened vacuum hoses etc. and tightened my belt.

Here's my problem - how do I find out what exactly is causing it if the sound isn't something I can reproduce (either standing still) or at will? I can't take my belt off and get on the highway or anything like that... It's been suggested that the problem is either a bad bearing in the engine, in the alternator or the oil pump but I'd hate to go throwing $100 here and there just to try and fix it with no clear path to resolution. I'm always worried that my belt is too loose though - is there a reliable way to check this besides "just push on it"? My TJ was a factory AC unit, but the PO bypassed the seized compressor with what looks like a shorter belt... I just pulled all the AC stuff out of it period.
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Old 02-11-2017, 11:00 PM   #40
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squealing/whistling vacuum leake

i bet this is a stupid question but hear goes.can a bad egr gasket cause a vacuum leak? oh and i removed and cleaned my throttle body and used the old gasket was that a no no also ? new to this
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Old 02-13-2017, 04:06 PM   #41
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@Big Bad John - I'm can't venture a guess at what you're dealing with. Iit does not sound symptomatic of the vacuum leak tho. The is very repeatable and occurs when the motor is not under load (idle) and does away as soon as you throttle it up. My guess is a bearing as well, particularly if it's spotty. Give it time, it'll get worse and show it's head
@dsheab I don't have an EGR on my motor, but anything that bolts to the intake can cause a vacuum leak. Best way to find them is with a bottle of starter fluid sprayed on every place that could be a leak until you hear the idle bump up temporarily.

btw.. old throttle body gasket is fine as long as it's still pliable. Mine was rubber bc I have Multi-port injection and I reused it more than once. If your injectors are on the throttle body, the gasket might be different, in which case I can't comment

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