Whistling--anyone fix it?
#1
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Year: 2004
Model: Grand Cherokee
Engine: 4.0
Whistling--anyone fix it?
I'm getting the whistling sound in my 04 GC 4.0. It only whistles at idle speed (let off the accelerator while driving). it goes away when i press the gas pedal. It is definitely an air leak around the intake area.
I have found posts on this, but they all seem to end with no fix.
Has anyone ever actually fixed this problem? The truck runs fine, it's just annoying as hell.
I have found posts on this, but they all seem to end with no fix.
Has anyone ever actually fixed this problem? The truck runs fine, it's just annoying as hell.
#2
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Year: 2004
Model: Grand Cherokee
Engine: 4.0
Bringing this back from the dead. I'm still getting this noise. It only seems to happen when the outside temperature drops below 60 degrees. Being that it is now winter, it has come back.
If anyone has figured this out, please help. When I let the truck idle to diagnose it, it goes away. Kind of hard to figure out when it only happens while driving.
If anyone has figured this out, please help. When I let the truck idle to diagnose it, it goes away. Kind of hard to figure out when it only happens while driving.
#4
its most likley a air box noise or intake tube if it has baffles in it try swaping it with another air box and intake tube and see if it goes away im a tech at a chevy dealer and i see this from time to time
Last edited by gmullin; 12-25-2010 at 03:21 PM.
#6
Old fart with a wrench
Simple, down and dirty! You can eliminate an intake vacuum leak with a propane torch. DON'T LIGHT IT!!! Just bleed gas and play it around the manifold area. If there is a leak, the engine will respond to the propane by speeding up. A technition would want to do a smoke test, which works, but can be expensive. A whistling sound to me indicates a vacuum leak especially under high manifold vacuum such as deceleration. Today's cam timing doesn't pull much vacuum at idle, so it is difficult to find a leak. Propane enrichment works well!
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#9
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Year: 95
Model: Grand Cherokee
Engine: 4.0
+1 on possible vac leak, should be easy to find with a can of brake/carb cleaner.
Try cleaning the throttle body/plate, also clean the IAC passage and valve. If one was dirty it could create turbulence or stick at a abnormal position.
If you have a cold air or open element air filter it could be normal.
Try cleaning the throttle body/plate, also clean the IAC passage and valve. If one was dirty it could create turbulence or stick at a abnormal position.
If you have a cold air or open element air filter it could be normal.
#10
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Year: 1993
Model: Cherokee
Engine: 4.0
#11
Old fart with a wrench
That's why I like propane! If it flashes, it's gone in a split second!
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