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Thread: Squeaky Engine

  1. #1

    Default Squeaky Engine

    Now,,, i have changed the main drive pulley arm and all,,idler pulley and the main drive for the a/c and i still get that cold belt sqeak sumtimes, i mean,, i jus couldnt figure out what it could be. Since its in the engine compartment it echoes and is misleading but ill bet my paycheck on it emitting from the Alternator pulley,,it sounds like it comes straight from that..its actually not as bad now since i put the 3 neew tensioners on,,but it does it for jus a lil bit before it warms up and then its good.. Before the new tensioners it was squealing like a pig everywhere i went! but now jus starts up a lil bit and stops,,anybody else had this problem,,, after spending over $200 or more on just parts and labor puttin on, i say if it aint broke dont fix it,,which is why i havent changed the Alternator yet.

  2. #2


    Have you tried using a stethescope to locate the squeek?
    If you have someone else start the truck while your under the hood with a mechanics stethescope you might have a better chance locating it.

  3. #3


    yeah my dads buddie is an awesomely greeat mechanic he used his stethescope but couldnt find anything thats why we ended up replacing like 3 parts,,still couldnt find it,,but it jus sounds like its emitting from that front pulley on the alternator..

  4. #4


    Sometimes if the battery is not real good the alto belt will squeal after start up. The battery drains enough on start up to cause a bigger load on the alto making it hard to turn-making the squeal. My 6.0l has been sqeaking for some time. Going to replace all belt and tensioner
    2003 Suburban 2500 LT, 6.0l Volant cai. 3.73 gear. Mobil 1 syn oil

  5. #5


    yeah i reckon its the pulley on the front of the alternator. its funny cuz it will start sometimes then stop and not squeak at all,,, and i have an OPTIMA red top battery so it shuldnt be pulling to hard

  6. #6


    If the squeal is only on a cold start and it goes away after a very few minutes, change the belt. That will fix the problem.

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

  7. #7


    As stated by @RayVoy its the belt. I had the same problem and was blaming everything but the belt. Threw in a new belt and walah fixed and no squeak. I had literally the exact same symptoms, except I noticed how lose the belt was even with the new tensioner. Also Rayvoy pointed out just change the belt, he was 100% right...

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage:

  8. #8


    Haha, thanks for the mention Conlan; it wasn't a guess, like both of you, I changed other things before I tried the belt. The old one looked fine, I even tried to wash it, it would still squeal on a cold start. I kept the old one for a spare.

  9. #9


    Yay learning from experience! . And yah keep the old belt it may be useful later and then you have an example of what belt to get.

  10. #10


    The old fan belts (non-serpentine) you could hit them with a little Armor All to stop squeaks. Try that with a serpentine and it can come off.

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