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Thread: 02 chevy cold start rough idle

  1. #1
    Junior Member
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    02 chevy cold start rough idle

    i have a 2002 chevy silverado 4wd 5.3 v8 with 143,000 miles on cold start the rpms ramp up to 200 for about 30 secs and drop to around 500 and barely stays running. after warms up runs fine, a local mechanic changed 02 sensors all 4, plugs, wire, cleaned injectors and throttle body. i changed tps sensor and ran fuel injector cleaner thru tank. i have codes of too lean bank 1 and 2 random cylinder misfire, and idle air excessive. any help would be appreciated

  2. #2
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    leolkfrm's Avatar
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    what is the reading on the scanner for the ecm temp sensor?
    4 wheels move the body
    2 wheels move the soul
    B.W.A.I
    Snow is a lot like religion and a lot like sex....you never know when you are going to get it!....or how much you will get

  3. #3
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    I don't know will have to check

  4. #4
    Senior Moderator chevychase's Avatar
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    Your getting to much un metered air in ..check for vacuum leaks at throttle body..air filter system...to throttle body
    Make sure it is all sealed tight...pcv valve... check all hoses...check the idle air control valve.
    Also clean the maf sensor.

    Gitter done have fun. Running on empty...running blind...running behind.....

  5. #5
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    Ok will check it out

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