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Old 11-26-2011, 12:46 AM   #1
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Whistling sound possibly(probably) coming from engine bay.

Just bought my first jeep, an 02 sport. After I have been driving for a little bit there is an annoying whistling sound when I let off of the accelerator. Can anyone tell me what that could be and a possible fix? Thanks

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Old 11-26-2011, 01:17 AM   #2
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I have been told it is a vacume line leak somewhere. Mine does that too, but only when it is really cold outside. Is it cold outside where you live? I end up forgetting about it each year. My Jeep is not a daily driver, and the noise goes away when it warms up. lol

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Old 11-26-2011, 10:39 AM   #3
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It wasn't THAT cold, low 50's maybe. I'll have to try to do some more research
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Old 11-26-2011, 12:04 PM   #4
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stick a 3ft piece of hose to ur ear & put the other end into the engine bay, nearest tb, vac. lines, ect.. it'll lead u to the whistle.
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Old 11-26-2011, 02:46 PM   #5
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The hose.
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Old 11-26-2011, 04:33 PM   #6
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How easy of a replacement would that be? I imagine it's a cheap part too
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Old 11-28-2011, 11:30 PM   #7
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So this problem starts when the engine gets warm. The whistling stops when i press on the accelerator.

Just a heads up... I've been scouring through web pages with this problem. People have been saying to tighten the bolts on the intake manifold... That seemed to work. I'll check the bolts and keep this thread updated.
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Old 11-29-2011, 06:12 AM   #8
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You have to use a piece of hose held up to your ear to pin-point it. Use vacuum cleaner hose if you have to. Be careful of the fan. Let us know too!
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Old 12-03-2011, 07:14 PM   #9
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You can NOT do the hose to your ear trick, the issue does not happen at idle,

I have an 03 with same prob. Below 60 Degrees get the 'whistle' when let off the accelerator down to about 1.5K RPM ish...... occasionally I can get it to do it at a stop light by revving it up but it only last a second.....never EVER been able to re-create in the driveway.

My research suggests intake/exhaust gasket, OR cracked exhaust manifold big job for non-mechanic, Big money to have pro do it. However, My 03 has the 2 piece exhaust which supposedly is not as prone to cracking.....so that theory may be out the window.

Hopefully someone chimes in with a "Been There Done That" response and an easy solution...... it's quite an annoying sound.
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Old 12-03-2011, 10:24 PM   #10
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The whistling starts after about 5min of driving. It keeps whistling even when stopped. The only time it stops is when I put my foot on the accelerator.
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Old 12-07-2011, 01:38 PM   #11
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Have the same problem with my 98 tj only it whistles all the time. I love it. I tell everyone when they ask that it s the super charger. (actually its only a 4 banger ) AND if you have a loose exhaust manifold you will get a ticking alot like you would get from a valve out of adjustment.............
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Old 12-07-2011, 01:50 PM   #12
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Quote:
Originally Posted by NY94YJ View Post
You can NOT do the hose to your ear trick, the issue does not happen at idle
Tape the hose to your head and work the throttle with your free hand...
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Old 12-07-2011, 02:23 PM   #13
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My 01 whistled load till the manifold gasket was replaced. No signs of leaks or lose bolts.
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Old 12-07-2011, 02:30 PM   #14
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I have a slight whistling too! I was told it was the air intake/filter....
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Old 08-12-2012, 08:40 PM   #15
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It's deffently the generator. It only happens when you use the battery a lot when the engine isn't running.

I just installed a new amp in my jeep and I used it while the engine was off a lot while I was working. As soon as I started it up I heard that whistle really bad. Then I found out it was just the generator straining to charge the battery back up. It stops when you rev your engine cause it's charging faster which means less strain on it. Just like you rev your engine when your jumping another vehicle.

Turn your lights on for like 10mins and then start your jeep and it will happen.

The only way I could think of how to fix it is get a new one. Doesn't really bother me though.
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Old 08-13-2012, 05:16 PM   #16
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With the engine at an idle you should be able to find the leaking hose by wiggling them one at a time. Could be cracked hose or just a loose end.
Hoses get hard with age and heat under the hood, so check for hoses that may be cracked, or loose if they just push on.
If it's a intake manifold gasket, try squirting some WD-40 around the gasket, it will suck into the hole and shut the whistle down momentarily ...
Any parts store has vacuum hose.... "BH"

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