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Thread: High Idle

  1. #1
    Newbie Chevyguy's Avatar
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    Sep 2007
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    Camden Wyoming, Delaware
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    Question High Idle

    Hey all, just joined the club, surfing the web and decided to see if there were any Siverado Clubs out there and this is the first one i came across. I have a 2000 Silverado (pictures to come) 1500 Ext Cab 4x4, i bought it in April with just over 107,000 miles on it. Not know what was done mechanically I've slowly been changing "time sensitive" parts, ie, plugs, PCV valve, EGR valve, and I've yet to change the wires. My dilema is after it warms up, it idles around 1100 rpms and just aches for me to let off the brake, don't get me wrong the truck runs like a raped ape, but how do I get it to settle down when I put it in park? (other than turning it off)

  2. #2

    Default

    Welcome, Chevyguy. 1100 is high. Thats like fast idle in my trailblazer. Have you had a scanner on it yet?



    Jamie

    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  3. #3

    Default

    On these EFI vehicles, one possible cause of a high idle is a vacuum leak.

    PS moving to Powertrain issues forum.
    Last edited by MrShorty; 09-20-2007 at 10:17 PM. Reason: moved thread
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  4. #4
    Newbie Chevyguy's Avatar
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    Cool

    Thanks for the Info, the last time I had the tranny changed (July) they scanned it and nothing other than what was wrong with the tranny (extreme slippage), as far as I can tell there are no leaks but I'll give another look over.

  5. #5
    Jr. Apprentice bobby's Avatar
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    Aug 2006
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    NorCal
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    Default things to check

    1.vaccumm leak.
    2.throttle plate not closing all the way @ idle.
    3.bad TPS.

  6. #6
    Jr. Mechanic
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    Sep 2007
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    Los Angeles, CA
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    Default

    Quote Originally Posted by bobby View Post
    1.vaccumm leak.
    2.throttle plate not closing all the way @ idle.
    3.bad TPS.

    That pretty much sum it up!! Since it seem like something new, double check:
    Your EGR gasket
    Coolant temp sensor wires
    And you might want to clean out your throttle body and Idle control valve

    Hope this helps and good luck!!
    '88 Jimmy 4X4
    5.3l L59/ 4L60E Tuned by Tad
    4" Lift 33" BFG. Custom Brush Guard, KCs, outside spare, Oil pan guard etc.

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