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  1. #1

    Default chirping noise from engine under load

    91 gmc sierra with 305
    When I put the truck into gear I hear a faint chirping sound and when I accelerate a little it gets pretty loud.
    In park or neutral the noise is really faint but doesnt get louder as I accelerate it has to be in gear. It is loud with a little acceleration and gets quieter with more acceleration. The noise is coming from the front near the crank pulley. I started it without the serpentine belt and it still makes the noise. Thanks for any help!
    Last edited by jveiga81; 05-24-2013 at 10:16 AM.

  2. #2


    Can you get a good look at the pulley to see if its loose or possibly got a crack on the mounting face?

  3. #3


    I looked at the pulley I dont see any cracks and the pulley is not loose at all. I will take a video and post it up on Monday. Thanks

  4. #4


    weird... no belt on the truck, but the pulley churps....
    try unscrewing your trucks radio antenna, and using it as a touch stethoscope on/near the timming pulley...
    you may have a spun bearing or something, but listen for it, and you may be able to find out exactly what/where it is.
    not seeing-hearing there myself, im pretty stumped...
    Gas was $1.83 when Obama took office.....

  5. #5


    I used a stethoscope and its really loud by the back of the engine near the catalytic converter. I thought it was the crank pulley but its very faint at the front. its more noticeable near the cat. I had the tranny inspected and the exhaust was replace from the cat back and they said my manifolds and y-pipe were fine. It looks like a hole in the y-pipe on the video but its just rust and I have no idea why there is red silicone around the clamp but the garage said it was fine. Here is a youtube link for my video

  6. #6


    I used a stethoscope and its really loud by the catalytic converter. I had the tranny inspected and they said it has nothing to do with the tranny. I had the exhaust checked and they put a new cat on and said my y-pipe and manifolds were fine. Here is a youtube clip of the noise

  7. #7


    well, yeah it would be loud there....
    thats weird... just keep looking for it with the stethoscope. youll find it eventually.
    im pretty sure my pilot bushing is shot... it does a sort of groan at each start up, only at start up. but i have a stick shift

  8. #8
    Sr. Apprentice
    Join Date
    Jun 2013
    1391 N Jefferson St., Anaheim CA 92807


    *Belts can be noisy, Fan belt, or power off belts that drive steering pump, air con make. *if you press the accelerator a bit, *you get to a steady rpm, the noise would return.While you are checking the belt and idler pulley, - don't forget to check the alternator too. If you get a long screwdriver, or even a small diameter stick of wood, and put it against alternator housing (both front and rear ends) which helps to reduce noise

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