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  1. #1

    Unhappy High pitched whining from engine compartment?

    I encountered a very loud and high pitch whining the other day from the engine compartment. I have a 93 C1500, 4.3L, ac, 203k miles. It begins when the engine is warmed up usually about 5-10 miles of driving. It does not occur when I am accelerating, only when I let off the gas or at idle. I have eliminated some possibilities, I removed the serpentine and started it up, still there, I used soapy water to check the hoses and from what I could tell, no leaks, saw no bubbling around the tbi or brake power booster. It sounds similar to a very loud tea kettle now that I think of it. I am at a loss, please help if you can. I need my baby for work.
    Last edited by damn_dragons; 07-02-2012 at 01:38 PM.

  2. #2
    Sr. Engineer
    Join Date
    Oct 2010
    Indianapolis, In


    Not gonna find it with soap looking for bubbles as it will most certainly be a vacume leak. Recheck all your vacume hoses and fittings and any caps on ports not used. You might try a carb cleaning product and spray around the throttle body and intake and hoses and listen for a change in engine speed to narrow your search to a particular area.
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

  3. #3


    Check the coolant level in the radiator, maybe the boiling kettle sound really is boiling water.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  4. #4
    Sr. Engineer Dana W's Avatar
    Join Date
    Dec 2011
    Chuluota, Florida


    Power steering pump. Either low fluid, or pump shaft bearing going bad. Had one do that once. Sounded like a supercharger after it got hot.

  5. #5


    Thanks folks, seems to be the gasket between the throttle body and the intake? I am going try some gasket sealer for the moment until I can get a replacement gasket. I'll let you know how it turns out.

  6. #6


    Yes it was the gasket, when I pulled off the throttle body, about 1/4 of the gasket was deteriorated. Replaced it and all is fine. I do thank you for your replies and comments. Now for the rest of the truck!

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