C5 whistle starting at 62mph
Thread Starter
2nd Gear
Joined: Jun 2019
Posts: 2
Likes: 0
C5 whistle starting at 62mph
Just bought a 99 c5 with 56k miles on it. Whistle noise starts around 62 mph and gets higher in pitch the faster I go. No noise when I take foot off of the gas. Sounds like it’s coming from the center of the dash. After market CAI, aftermarket stereo. It’s is an FRC model. Any thoughts to where I should look first?
Melting Slicks
Joined: Sep 2011
Posts: 2,258
Likes: 543
From: Appleton WI
My guess is you have an air leak. Have you tried revving the engine while sitting still? If the whistle repeats, you can attempt to troubleshoot. Get a can of carb cleaner and spray various components of your CAI. When the whistle stops, you have narrowed down your suspect area.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,591
Likes: 4,055
From: Cape Coral, Florida
The way I see it don’t think it’s a vacuum leak...now when is engine vacuum the highest ???...at idle !!...vacuum decreases as the throttle plate is opened...that’s my 2 cents...ok, well maybe 1 cent !!
Melting Slicks
Joined: Sep 2011
Posts: 2,258
Likes: 543
From: Appleton WI
Didn't realize vacuum reduced at higher RPM. Learned something new.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,591
Likes: 4,055
From: Cape Coral, Florida
LOL !!...it’s a freebie my friend !!...that’s why you increase RPM to see if you have a vacuum leak when diagnosing a “lean code”...less vacuum so less air overall getting drawn in putting it simply...so long term fuel trims will decrease !!
Thread Starter
2nd Gear
Joined: Jun 2019
Posts: 2
Likes: 0
My guess is you have an air leak. Have you tried revving the engine while sitting still? If the whistle repeats, you can attempt to troubleshoot. Get a can of carb cleaner and spray various components of your CAI. When the whistle stops, you have narrowed down your suspect area.
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