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  1. #1

    Default 05 Colorado Smoking

    My sons 05 Colorado smokes real bad on startup. Can someone tell us what might be wrong and what repairs can we expect. The truck gets regular service and is very well maintained.

  2. #2

    Default

    dont you know that if smoking isnt good for your health, it cant be good for your trucks health either....

    fluid residue in the engine compartment?
    leak somewhere, being burnt off as components heat up?

    where does it leak from? how long? what color is the smoke?

    oh and welcome to the club!
    2000 Chevrolet Silverado

    Powertrain:
    4.3L V6, 4L60E, 2WD, Single Cab
    Performance:
    Airaid CAI
    Poweraid TB Spacer
    Flowmaster 10-series exhaust (dumped)
    BLACKBEAR TUNED!!!
    Edge CS insight monitor
    4.10 gears
    Limited-slip differential
    LS-1 Dual Electric fans
    Corvette tranny servo swap

    Audio:
    Head Unit: Alpine
    Speakers: Alpine SPR-60C 6.5" component set, 4X6 Infinity Kappas
    Subs: 2-12" Kicker CVT's
    Amps: Alpine-M1000 (subs), Alpine MRX-F65 (Speakers)


    Tires/Wheels:
    305/70R16 NITTO Terra Grapplers
    16" PROCOMP 7089's
    Suspension:
    2" leveling kit
    3" Fabtech Spindle Lift Kit
    Front/Rear-Bilstein 5100 shocks

    Lighting:
    FRONT
    35W HID Low Beams
    RECON LED smoked roof cab lights
    REAR
    HELLA LED taillights and 3rd brakelight
    HELLA FF-75 Aux. Reverse Lamps
    RIGID dually D2, flush mount, wide beam
    Accessories:
    Hawk HPS Brake pads
    Russell braided steel brake lines
    Powerstop-red powdercoated brake calipers
    Powerslot Cryo brake rotors
    EGR in-channel window visors

  3. #3

    Default

    Quote Originally Posted by reggiecab2000 View Post
    dont you know that if smoking isnt good for your health, it cant be good for your trucks health either....

    fluid residue in the engine compartment?
    leak somewhere, being burnt off as components heat up?

    where does it leak from? how long? what color is the smoke?

    oh and welcome to the club!
    It only smokes on start up. If it sets for a few minutes and is restarted it smokes like crazy out of the tail pipe. I am thinking valve seals but I am by no means a great mechanic.

  4. #4

    Default

    You didn't say if it was the I4, or the I5 engine; doen't matter much, they're basicly the same engine. Part of the Atlas family, derived from the I6 used in the Trailblazer and Envoy trucks. All are double overhead cam engines.

    You didn't say what colour the smoke is, grey/blue usually indicates oil, while white indicates coolant.

    A coolant leak is probably a bad head gasket. Oil, as you suggest, could be valve seals, or ring blow by.

    If oil is the problem, I'd try a conditioner before tearing the head off, something like Seafoam, or Lucas.
    Ray

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

  5. #5

    Default

    Quote Originally Posted by RayVoy View Post
    You didn't say if it was the I4, or the I5 engine; doen't matter much, they're basicly the same engine. Part of the Atlas family, derived from the I6 used in the Trailblazer and Envoy trucks. All are double overhead cam engines.

    You didn't say what colour the smoke is, grey/blue usually indicates oil, while white indicates coolant.

    A coolant leak is probably a bad head gasket. Oil, as you suggest, could be valve seals, or ring blow by.

    If oil is the problem, I'd try a conditioner before tearing the head off, something like Seafoam, or Lucas.
    It is an I5. The smoke is blue and lingers for a while. What does the treatment in the oil do? Does help open drain back holes in the head? Thanks for helping, Rick

  6. #6

    Default

    If the problem is a stuck oil ring, the oil treatment may free it.

    Like you, I suspect a worn valve seal, but you never know.

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