Morningtime sputters

Discussion in 'General Chevy & GM Tech Questions' started by mvoss2576, Aug 9, 2010.

  1. mvoss2576

    mvoss2576 Rockstar

    Every morning, after my truck has sat for several hours... it sputters on startup. The rest of the day its fine.
    I've run injector cleaner through it, and on a bottle of HEET now...

    Any ideas?
  2. MightyMax

    MightyMax Rockstar 100 Posts

    IAC maybe??
  3. engineerbrian

    engineerbrian Member

    hey guys i just wanted to get this back on the top of the list since it really wasnt answered. Mainly because i'm really curious as to what caused the problem for mvoss since i had the same exact issue when my truck was brand new. I took it back to the dealer several times under warranty and they said they couldnt figure it out! the problem went away, but i've always wondered what it was.

    mvoss, any update?

  4. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Sounds like a leaky injector, leaks down after setting and floods that cylinder. May be a few injecters. Try putting a pressure gauge on and see if the gauge goes down after shutting off engine. If it does its most likely a dribbling injector.
  5. mvoss2576

    mvoss2576 Rockstar

    Brian - no update on what is causing this yet on my end.. some mornings are worse than others.
    What is an IAC? And where would I put a pressure gauge on?
    Truck has just over 100k on it, and just started in the last 3k miles or so... also about the time the weather really started heating up.
  6. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    The IAC is the Idle Air Control valve. It is on the throttle body and can get a chunk of carbon in it, and or else just a sluggish servo.
    As to the leaking injector. There should be a port that you install a Fuel Pressure guage up on the intake. But with the high temps i would for sure check the fuel pressure!

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