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  1. #1

    Default 2004 chevy silverado idle problems

    OK here it is, I have recently gotton a 2004 chevy silverado with the vortec engine. this truck was abandoned by a prior renter. finally got it cranked and there are a few problems i hoped you guys and gals could help with.
    1st: engine idles high..(never idles down)
    2nd: when you touch throttle it revs high and takes about 5 sec for it to come back down. this is really weird because you just touch the throttle.... and it goes high like 4k or so.. any ideas? noticed that the odb II jack is not working either.

  2. #2
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
    Blog Entries


    I think the "high idle" is a problem with the IAC, but I'm not sure if it would also cause the 4,000 RPMs when barely touching the gas pedal. That could be a separate problem
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  3. #3
    murdog94's Avatar
    Join Date
    Feb 2008
    Cloquet, Minnesota, United States
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    Which motor do you have? because there is no IAC (idle air control valve) on the 2003 up Chevy V-8s. So if it is a V-8 then you may want to clean the throttle body, and go from there.
    And the check engine light is on? and how do you know the OBDII port isnt working? you hooked up an OBDII reader? did you check the Lighter fuse since that should be the power to the OBDII port.


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  4. #4
    Jr. Mechanic Jay's Avatar
    Join Date
    Dec 2010
    Lakeville, Massachusetts, United States


    I wish someone would abandon a truck for me... their loss, your gain.

    2003 Chevy Silverado Ext Cab Z71
    2" Rough Country Leveling Kit and Stabilizer
    285/65R18 BFG TA KO on Black Rhino Rockwell
    Magnaflow Cat Back
    K&N 57 Series Intake
    Diablosport Predator
    Nerf Bars, Tint, Soft Tonneau

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