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Old 06-17-2010, 04:24 PM   #1
JasonYo
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Icon3 High pitch noise coming from engine.

So when my engine is warm and only at idle it starts to make this high pitch whistling/squeaking noise. I know that it is not any of the belts or the intake. It is also not any of the vaccume hoses on the intake manifold.

Heres a video to see what it sounds like. You can hear it really well towards the end.

http://www.youtube.com/watch?v=VINMLaXpU4o



If anyone knows what it could be please help, it is the most annoying thing ever! And I cannot figure this out! Thanks.
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Old 06-17-2010, 04:47 PM   #2
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Default Re: High pitch noise coming from engine.

man thats a tough one gl
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Old 06-17-2010, 04:59 PM   #3
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Default Re: High pitch noise coming from engine.

Ya I know lol. thanks.
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Old 06-17-2010, 06:57 PM   #4
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Default Re: High pitch noise coming from engine.

Sounds like a bad pulley bearing. Use an inexpensive engine stethoscope to pinpoint the noise.
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Old 06-17-2010, 07:21 PM   #5
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Default Re: High pitch noise coming from engine.

Alright I'll try to check those out.
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Old 06-17-2010, 07:24 PM   #6
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Default Re: High pitch noise coming from engine.

Also check your alternator. If you can, start eliminating a/c, altrernator, p/s belts one by one, and see if the sound goes away. I hope this helps.
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Old 06-17-2010, 07:36 PM   #7
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Default Re: High pitch noise coming from engine.

Well I don't have a/c, and I ran the engine with the alternator belt off so it's not that.

I might try disconnecting the p/s belt to see if its that.
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Old 06-17-2010, 08:38 PM   #8
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Default Re: High pitch noise coming from engine.

Quote:
Originally Posted by JasonYo View Post
Well I don't have a/c, and I ran the engine with the alternator belt off so it's not that.

I might try disconnecting the p/s belt to see if its that.
cheap stethoscope = piece of hose.
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Old 06-18-2010, 07:28 AM   #9
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Default Re: High pitch noise coming from engine.

Hmm yes, good idea!

I'll try to pinpoint the noise first, but I did listen very carefully for a while the other day and it seems to be coming from the cam pulley area or just behind. The noise is clearly not from the p/s area.

Is it possible that the timing belt is to tight or something?

Or could the pulleys be making this noise?
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Old 06-18-2010, 09:27 AM   #10
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Default Re: High pitch noise coming from engine.

Try squeezing your pcv hose when it's making the noise.
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Old 06-18-2010, 09:32 AM   #11
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Default Re: High pitch noise coming from engine.

Quote:
Originally Posted by RonJ@HT View Post
Sounds like a bad pulley bearing. Use an inexpensive engine stethoscope to pinpoint the noise.
Agreed. And I wanted to compliment you on how clean the engine bay is!
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Old 06-18-2010, 10:04 AM   #12
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Default Re: High pitch noise coming from engine.

Honestly, it sounds like air whistling as it goes through the IACV passages. If you notice it only whines when the IACV opens up. I had a 5.0 Mustang that did that, as well as many other 5.0's. Take off your IACV and sand the sharp edges down slightly.
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Old 06-18-2010, 10:12 AM   #13
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Default Re: High pitch noise coming from engine.

yeah its definitely air. soon as you give it even the littlest throttle it goes away.
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Old 06-18-2010, 01:32 PM   #14
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Default Re: High pitch noise coming from engine.

I'll check the IACV, I was told it was a air leak or something for sure.
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Old 06-18-2010, 01:34 PM   #15
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Default Re: High pitch noise coming from engine.

Quote:
Originally Posted by Hill4589 View Post
Agreed. And I wanted to compliment you on how clean the engine bay is!
Thanks! I try to keep it as clean as possible.
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Old 06-18-2010, 01:36 PM   #16
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Default Re: High pitch noise coming from engine.

Quote:
Originally Posted by JasonYo View Post
I did listen very carefully for a while the other day and it seems to be coming from the cam pulley area or just behind.
Quote:
Originally Posted by JasonYo View Post
I'll check the IACV, I was told it was a air leak or something for sure.
The locations of the sound and IACV aren't a good fit.
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Old 06-18-2010, 01:49 PM   #17
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Default Re: High pitch noise coming from engine.

Yeah, well the sound is more towards the rear drivers side of the engine. It's not at all near the tb. So it's probably not that.
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Old 06-18-2010, 01:53 PM   #18
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Default Re: High pitch noise coming from engine.

Quote:
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Yeah, well the sound is more towards the rear drivers side of the engine. It's not at all near the tb. So it's probably not that.
Sounds like the alternator. As already mentioned, remove the alt belt to see if the sound goes away.
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Old 06-18-2010, 09:27 PM   #19
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Default Re: High pitch noise coming from engine.

Yeah I did that and the sound didn't go away!

A lot of people have been telling me that it sounds like a air leak, not bad bearings. I don't know tho.
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Old 06-19-2010, 05:40 AM   #20
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Default Re: High pitch noise coming from engine.

Someone said that it could be a intake valve leaking. Is this possible?
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Old 06-19-2010, 06:05 AM   #21
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Default Re: High pitch noise coming from engine.

Seriously, I paid only $4 for an engine stethoscope at Harbor Freight Tools.
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Old 06-19-2010, 02:14 PM   #22
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Default Re: High pitch noise coming from engine.

Well I'll get one it's just that I work everyday except sunday and I can only work on my car at night. Stores are pretty much closed when I'm off.

I guess i'll just wait until then.
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Old 07-15-2010, 02:13 PM   #23
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Default Re: High pitch noise coming from engine.

Any more Ideas as to what this might be?

Still haven't figured it out, and don't have the time to do anything big like take my engine apart. =/
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Old 07-16-2010, 10:16 AM   #24
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Default Re: High pitch noise coming from engine.

That's a clean *** engine bay
+1
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Old 07-16-2010, 09:53 PM   #25
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Default Re: High pitch noise coming from engine.

Thanks!
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