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  1. #1

    Default 08 Silverado 1500 rough idle!

    I recently came across a rough idle in my 2008 silverado 1500 5.3L LT.
    Took advice from reader and replaced #2 ignition coil. Nothing.
    tried new plugs, oem. Nothing.

    I still have that annoying trembling feeling at idle.

    Any suggestions?
    ​Stay Classy, Wear a Bowtie!

  2. #2

    Default

    Fuel pump pressure?

    low fuel pressure could lead to a lean idle misfire.
    Lerch
    This is Chevy Country.

  3. #3

    Default

    Does it seem to smooth out while your driving? Is the check engine light on? Need more info. You should probably check the compression in each cylinder. If one or two of them have considerable lower compression your truck could have a burnt valve, thats what happened with my 92 Z71, but it had alot of miles on it when it did though. If the check engine light isnt on thats what you need to check first, if it is on you need to check whats causing it to come on and go from there. Im just a "shade tree mechanic" so this is far from expert advise lol, but i have a little experience under my belt.

  4. #4

    Default

    I guess if your not getting any codes then a few suggestions would be too, clean all the MAF sensors and the throttle body. Since you already replaced the plugs, maybe try and checking the resistance of the wires? Hopefully after doing all this it will eventually go away! Good luck!


    2009 Chevy Silverado!

    Blacked out tail lights + 3rd brake light
    l Tint: 35% front windows and Limo on the rest l Hard wired Valentine One radar detector l Pirelli Scorpion Ice & Snow tires with GM CK375 wheels l Hand welded receiver hitch l HID lighting l SMD lighting l Blacked out front and rear emblems l Cherry Bomb Extreme exhaust dumped l 2 Kenwood 12's powered by a Kenwood amp w/ an Base control l

    2007 Chevy Tahoe LTZ---2012 Chevy Cruze
    ---

    "Let's just agree that a perfect truck is hard to find, and we'll drive the Silverado till we find it." - Car and Driver

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