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Old 07-02-2007, 04:54 AM   #1
jkilla71
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Default Loud Squealing at Idle.

I am having a loud squealing when the car idles. It doesn’t get faster or louder when you rev the engine and the noise disappears when driving but when you let off the throttle the loud squeal returns and constant. The belts are in good shape and the noise sounds more like brakes squealing but it make the squeal while stationary. I did a search but was unsuccessful finding an answer. Any ideas???
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Old 07-02-2007, 04:57 AM   #2
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hmm.. my car is starting to do that too. usually more often on cold rainy days...
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Old 07-02-2007, 05:29 AM   #3
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check if the belts are loose. check if the radiator fan is rubbing.
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Old 07-02-2007, 05:29 AM   #4
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It sounds like a bearing or something. Possibly a waterpump? A short piece of garden hose works well as a stethoscope. Perhaps you could narrow the sound to a particular pulley or area of the engine. Just be careful not to get the hose caught or tangled in the moving belts or fan blades.
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Old 07-04-2007, 01:02 AM   #5
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It turned out to be the crankcase vent valve. I read on another thread to check if it was bad by just taking off the oil fill cap. As soon as I removed the cap the squeal stopped. I can't believe how much noise the bad one made; it sounded like brakes squealing constantly.

I bought a new vent valve(62.50) at the local dealership and installed it in about a hour. The hardest part was trying to determine what size hex-key to use.(5mm) I should have removed the intake manifold because it would have been a lot easier to remove and install the vent valve due to the limited working space.
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Old 05-12-2009, 08:18 PM   #6
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Default Loud Squealing at Idle

I just had the same problem on my '95ti Automatic! There was a loud squealing that sounded like one of the serpentine belts. But when I removed both belts, the squeal would continue. Removed the oil filler cap and it went away. Changed the crankcase breather (or vent) valve and the problem is solved! Who would have guessed? Thanks for this thread. I never would have found it otherwise.
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Old 08-18-2010, 06:30 AM   #7
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That's what my TI is doing so it might be that I'm going to try it so do I remove the cap when the car is hot or cold?
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Old 08-18-2010, 07:11 PM   #8
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Hi Ralliart,

I found the squealing occurred when the engine warmed up. But it really doesn't matter. Run the car and when the squealing starts, remove the oil filler cap. If the squealing goes away, Bob's Your Uncle! You need to replace the crankcase breather.

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Old 08-19-2010, 04:44 AM   #9
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I tried it but it still squeals I think it might be the idler pulley
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Old 08-19-2010, 05:38 AM   #10
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Yes, sounds like one of the pulleys. Remove the serpentine belt and make sure the squealing stops.
- If yes, see if you can determine which bearing has the most play - idler, alternator or power steering.
- If no, check the AC compressor and it's idler pulley.
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Old 08-19-2010, 06:12 AM   #11
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Quote:
Originally Posted by cslayman View Post
Yes, sounds like one of the pulleys. Remove the serpentine belt and make sure the squealing stops.
- If yes, see if you can determine which bearing has the most play - idler, alternator or power steering.
- If no, check the AC compressor and it's idler pulley.
All of my pulley bearings had a significant amount of play in them, but the noise was coming from the belt. I know this because I replaced all of the pulleys after noticing the play, but kept the old belts. Two days after replacing pulleys, noise was back. Replaced the belts and haven't had a problem since. For the cost of a $5 can of belt lube, you can eliminate whether or not it's the belts and save yourself about $60 if it is the belts. Just my $.02
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