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Old 05-02-2013, 08:28 AM
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Whistleing noise

Anyone ever have this issue before. Seems to be under the hood.

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Old 05-02-2013, 08:30 AM   #2
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Is the whistling happening only when driving or while idle too?

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Old 05-02-2013, 08:31 AM   #3
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Could use a little more description buddy. have you opened the hood and had a listen to where it's coming from?
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Old 05-02-2013, 09:51 AM
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Sorry, 03 Wrangler TJ 4.0 5 speed. I have looked under the hood and can't pin it down. i can hear it while driving slow. Obviously the road noise drowns it out at higher speeds.
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Old 05-02-2013, 09:54 AM
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also while idleing
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Old 05-02-2013, 10:06 AM   #6
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Do you have an aftermarket intake or performance throttle body. A lot of times aftermarket TBs have casting issues in the throat that cause a whistle. Air intakes will do it just from the volume of air moving through the opening.

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Old 05-02-2013, 10:07 AM   #7
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Do you have a CAI or Throttle Body Spacer? Both of these tend to create a whistling sound.

And Is it a clear Whistling sound or a Whining Sound?

If it is a whistling sound more than likely a vacuum leak.
Whining Sound could be a pully or bearing.
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Old 05-02-2013, 10:09 AM   #8
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I would go with vacuum leak as well. Do you know how to check?
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Old 05-02-2013, 10:12 AM
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I put on a Banks cold air intake thinking this may correct the problem but it didn't. I believe the Throttle body is stock. Not sure how to check for leaks.
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Old 05-02-2013, 11:08 AM   #10
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You just take a can of carb cleaner and spray little bursts around vacuum lines with the engine running. If you find a leak, the rpm will change. This helps you pinpoint exactly where it is so you can deal with it.
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Old 05-02-2013, 11:10 AM
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Ill try it!
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Old 05-02-2013, 11:13 AM   #12
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Quote:
Originally Posted by Forney231 View Post
I put on a Banks cold air intake thinking this may correct the problem but it didn't. I believe the Throttle body is stock. Not sure how to check for leaks.
My CAI only whistles when its cold then goes away when warms up. Is there a spacer between the TB and the Intake Manifold? TB Spacers can cause the whistling also. I would make sure to eliminate the obvious and easy things first.

But my guess would still be a vacuum leak.
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Old 05-02-2013, 11:14 AM   #13
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You could also blow smoke on the vacuum line and look for any spots that suck in the smoke. Carb Cleaner works good too.
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Old 05-02-2013, 12:36 PM
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Didn't find a vacuum leak with the carb cleaner
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Old 05-03-2013, 12:10 AM   #15
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I have a K&N intake and have noticed a whistle. Was gonna ask this question in a few days if I couldn't find it. I did have a vacuum leak but I fixed that issue and the whistle continues.

Maybe I'll have to break out the carb cleaner too. Keep us (me) in on any findings Forney!

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