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  1. #1

    Default Help, please rough idle

    Just put in the new spark plugs and wires as well as cold air intake. Was idling roughly before and immediately after the install all seemed well. This morning it was about 10 degrees out and I fired it up. Very rough idle, loud ping noise, I guess that's what misfiring sounds like? Revs were up and down, once I'm moving down the road it's fine. Come to a stop light and the revs dip again feeling like its going to stall. Sound like an idle air valve problem? Just bought the damn thing and the check engine light was on for the catalytic converters. So I'm not sure if the CEL is on now for something else.

  2. #2

    Default

    My guess is that its running lean... Hence the codes on the cats. Probably the MAS.
    2009 Chevy Silverado 2500HDLT 6.0L w/ Towing Package, Dick Cepek GM8 Rims, Dick Cepek FC II 33X11.50R17,RKSport Ram-Air Hood(Functional), Lazer Lite Aluminum Tonneau Cover, Road Armor Stealth Bumper, PIAA Lighting, Diablo Trinity Tuner, Diablew Custom Tune, BullyDog Cold Air Intake, American Racing Headers w/highflow cats, Corsa Performance Sport Exhaust, Custom Striping, Black Bowties front and rear, Fuel Grille Inserts, Recon Headlights, Readylift Shocks, Readylift Upper Contol Arms, 2" Blocks in the Rear..

    Future Plans: HD Tie Rods, Under hood upgrades, Crower Camshaft and possibly electric fans.

  3. #3

    Default

    The best approach is to pull the codes and come back here with each code (if there is more than one)
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  4. #4

    Default

    If you have the codes, check out obd-codes.com and ask here, someone will be able to help you.


    2010 Silverado Z71

    Kyle-USAF-MI/VA

    "Fueled by Haters"

    TCS front box 7"-9" set at 8.5" | FTS coilovers(blue coil) with resis and FTS shocks with resis| 20" Fuel Off-Road Revolver Rims | 35x12.50 Nitto Trail Grapplers | Halo Projector Head Lights by Recon- Black | Led Taillights by Recon- Smoked | Dumped Straight pipe | Volant CAI | Ranch Hand Front Bumper | DiabloSport Trinity Programmer | Tow Mirrors with Turn Signal | Cervinis Ram-Air hood | 4.56 USA gears with tru trac locker | Longshot Lighting 6000k 55w low beam and 6000k 35w fogs HIDs | 7" lift leaf spring | Blue TCS traction bars

    Future Mods: Long tube headers
    | Custom tune | Cam | Stall Converter

  5. #5

    Default

    Yes get the codes... This will verify. I am guessing lean as it would be rare for the two to be tripping otherwise. I have a feeling it will be lean on bank 1 and bank 2. This is what my sons truck did when is MAF failed.
    2009 Chevy Silverado 2500HDLT 6.0L w/ Towing Package, Dick Cepek GM8 Rims, Dick Cepek FC II 33X11.50R17,RKSport Ram-Air Hood(Functional), Lazer Lite Aluminum Tonneau Cover, Road Armor Stealth Bumper, PIAA Lighting, Diablo Trinity Tuner, Diablew Custom Tune, BullyDog Cold Air Intake, American Racing Headers w/highflow cats, Corsa Performance Sport Exhaust, Custom Striping, Black Bowties front and rear, Fuel Grille Inserts, Recon Headlights, Readylift Shocks, Readylift Upper Contol Arms, 2" Blocks in the Rear..

    Future Plans: HD Tie Rods, Under hood upgrades, Crower Camshaft and possibly electric fans.

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