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  1. #1
    Join Date
    Sep 2011
    Fredericton, NB, Canada

    Default 08 silverado 5.3L irregular idle

    Hey guys, I just ported and cleaned my throttle body today, and since i replaced it, I've noticed the revs to be slightly different than before. For example, when I put the truck back into park, the idle will shoot from about 600rpm to about 1500rpm and hold for approx. 30 sec. before finally returning to 600rpm.

    I did read on another forum that the ecm needs to relearn its throttle positions, and that it modifys to the driver's 'style'. Apparently it can take up to 200mi for for the ecm to relearn this. However I need verification on this. Thoughts? Thanks

  2. #2
    Join Date
    Sep 2011
    Fredericton, NB, Canada


    I found this useful PDF, followed the simple instructions, and now throttle/idle is relearned, back to normal. I'll leave this document here, should others have the the same problem I did. Cheers!
    08 Silverado 5.3L Z71

  3. #3


    Very good info, Thanks!!

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

  4. #4


    hey guys i clicked on link to fix problem but it says error please help i have the same problem i went at it with a drimel .......

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