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  1. #11

    Default

    check your pvc valve and the lines going into the air box tube make sure nothing came off. id have a buddy rev the truck up so you can get next to the motor and pin point it

    next would be to check the fuel trim and see if it is running rich
    GM TECH

    05 silverado shortbed

  2. #12
    Jr. Mechanic
    Join Date
    Aug 2009
    Location
    Connecticut
    Posts
    148

    Default

    I'll give it a look.. thanks for the help!

  3. #13

    Default

    I don't mean to hijack the thread, but I noticed it's been quiet for several months.

    My 05 Avalanche 5.3 (stock) has made the same hissing sound just off idle since I bought it back in '07 with 34k miles. I even had the dealer listen to it. They said it was normal, but did clean the throttle body under warranty. I'm now at 85k, and the sound hasn't changed....except for something new I've noticed this year.

    Under moderate acceleration I'm hearing a pulsing air/sucking sound somewhere between 2800 and 4k rpm. It's much more noticeable with the AC running, but can be heard with no accessories on. It seems to be in rhythm with the engine, making me wonder if it could be the intake gasket. Other than the sound, it seems to be running fine, no noticeable reduction in power or economy. No codes. At first I thought it might be the passenger exhaust manifold (seems to be coming from that side), but it doesn't tick or smell like exhaust under the hood. The sound isn't very loud, but I may be able to pick it up on video.

    Thanks for any help!

  4. #14
    Sr. Engineer
    Join Date
    Aug 2009
    Location
    Virginia Beach, VA.
    Posts
    337

    Default

    This engine has a TBI you said??

    If so, check the gasket between the TBI and the intake.

  5. #15

    Default

    Jimbo,

    My 2003 Silverado 4.8 just started making the exact same sound as your video. Did you ever find the cause? I also have a slight whistling noise under moderate acceleration. 2000-3000 rpm. I noticed this today on my way to work. Thanks!

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