High Pitch Whistling...

[blue_kjR417]

I've been noticing a high pitch whistling noise while driving my Jeep lately. I only hear it when I'm on the accelorator, if I let off it stops, and when I get back on it, it starts again. I only hear it after the Jeep has been running for a while. Like I may make a trip to the store and back (15 mile round trip) and it not do it the whole time, but if I run a few errands after I go to the store and grab a bite to eat it will probably be doing it before I get home. I'm not sure what it is or if its even a problem, but its kind of annoying because its really pretty loud I can usually hear it over my radio when its about 1/4 volume. I kinda sounds like its coming from behind me when I'm driving but I'm not sure.

 

[Warren.fischbeck]

Is it a constant whistle? or does it fluctuate with the speed your traveling?

 

[valvestem]

Sounds like a disconnected/dry rotted/damaged vacuum line somewhere. Pop the hood, with engine running and listen, watch out for the fan blade(s).

 

[autoboy454]

Do you have an aftermarket intake tube and filter on your KJ? When I put one on mine it whistled... so I went back to the stock airbox...

 

[Green Liberty]

Took mine in twice for this:

Component Description:
5. ENGINE AND ENGINE COOLING:ENGINE Bulletin Number: 0900107
Bulletin Date: Mar 2007

Vehicle: 2,007 Jeep Liberty
Summary:
INTAKE - TO - THROTTLE BODY JOINT MAY CAUSE A WHISTLE - LIKE SOUND ON 3.7L ENGINES. ( NHTSA ITEM NUMBER - 10021422 )


If I let off gas or gave it a little more, it would go away.

still does it some in the winter. I just live with it.

 

[ShafferNY]

My girlfriend's '06 does it when under load, such as climbing a high at highway speeds. I never worried about it because it hasn't caused any drivability problems.

My '03 has never made a peep. It's the good child.

 

[JLRockies]

JL Audio makes a nice subwoofer system that will give you more umph at 1/4 volume.

 

[blue_kjR417]

Is it a constant whistle? or does it fluctuate with the speed your traveling?

Well it only does it when I'm on the gas and have been driving for a while.

Do you have an aftermarket intake tube and filter on your KJ? When I put one on mine it whistled... so I went back to the stock airbox...

Nope its stock.

JL Audio makes a nice subwoofer system that will give you more umph at 1/4 volume.

Yeah, well I listen to country music so the only bumpin I need comes from the gravel road.

 

[osufans]

maybe you have one of these and you just don't know it - http://www.youtube.com/watch?v=Nnzw_i4YmKk

Oh BTW, if you've never listened to country with a nice sub system...you're missing out!

 

[blue_kjR417]

maybe you have one of these and you just don't know it - http://m.youtube.com/watch?gl=US&client=mv-google&hl=en&v=PitGkp1ncXE

Oh BTW, if you've never listened to country with a nice sub system...you're missing out!

I have its ok but not worth it to me.

 

[Porkchop]

Tryed to look this up for you and this is what I found. Hope it helps out.
INTAKE - TO - THROTTLE BODY JOINT MAY CAUSE A WHISTLE - LIKE SOUND ON 3.7L ENGINES. ( NHTSA ITEM NUMBER - 10021422 )
Service bulletin 0900107
Sounds like that can drive you crazy and not let you enjoy the ride.
Check your throttle body and let us know.