Off Idle Whistle
Thread Starter
Launching!
Joined: Mar 2012
Posts: 299
Likes: 21
From: Phoenix, AZ
Off Idle Whistle I have an off idle whistle that is driving me insane. As soon as I hit the pedal, I hear an air sucking sound and a slight whistle which also happens at part throttle and goes away at full throttle.. I really dont think this is a vacuum leak because the engine runs fine otherwise. It sounds like the sound is coming from the stock throttle body. Any ideas on how to fix it?
I have an off idle whistle that is driving me insane. As soon as I hit the pedal, I hear an air sucking sound and a slight whistle which also happens at part throttle and goes away at full throttle.. I really dont think this is a vacuum leak because the engine runs fine otherwise. It sounds like the sound is coming from the stock throttle body. Any ideas on how to fix it?
Andrew
Misery loves company. I have the same whistle and unable to find it. Like you, I think that a vacuum leak has been ruled out because I replaced the gaskets and sprayed looking for leaks. Nobody else is reporting this whistle so whatever it is we appear to be in an elite group.
Thread Starter
Launching!
Joined: Mar 2012
Posts: 299
Likes: 21
From: Phoenix, AZ
Misery loves company. I have the same whistle and unable to find it. Like you, I think that a vacuum leak has been ruled out because I replaced the gaskets and sprayed looking for leaks. Nobody else is reporting this whistle so whatever it is we appear to be in an elite group.
Andrew
Mine is drive by wire. The whistle will get louder as the RPM increases in each gear. At idle and a bit above there is no whistle. At highway speeds there may be a small whistle but the wind noise on my '39 may be masking it.
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TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
Really common on non GM cars (Jeep) when the TB is bored and the IAC channel gets thinner..
Jeeps use a GM derived IAC valve, they whistle a lot.. When upsized.. Some guys have fixed it by
fiddling with the base gap on the throttle plate. (Close it and use a Hole in the butterfly ...)
Jeeps use a GM derived IAC valve, they whistle a lot.. When upsized.. Some guys have fixed it by
fiddling with the base gap on the throttle plate. (Close it and use a Hole in the butterfly ...)
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On The Tree
Joined: Jun 2016
Posts: 143
Likes: 26
From: Tucson
Are you running the evap purge valve?
I had a VERY pronounced whistle at anything above 20 mph. Long story short, the charcoal canister started falling apart internally. Sent little bits of carbon sand through the vent line all the way up to the purge valve. Plugged the line solid. Once I cleared the line out the whistle went away.
Not sure how or why it whistles when it's plugged, but I promise you it did for me.
I had a VERY pronounced whistle at anything above 20 mph. Long story short, the charcoal canister started falling apart internally. Sent little bits of carbon sand through the vent line all the way up to the purge valve. Plugged the line solid. Once I cleared the line out the whistle went away.
Not sure how or why it whistles when it's plugged, but I promise you it did for me.
