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Thread: Smoky Engine and Drive Clean

  1. #1
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    Smoky Engine and Drive Clean

    My '99 F250 4.6 liter all of a sudden started blowing smoke out the tail pipe, especially at start up.
    Took to the dealer...no codes (?)....so they checked it on the Drive Clean system in test mode. It passed!
    Hydrocarbons were up but still within threshold.
    What's the point of emission testing if an oil burner will pass?

    Couple of cans of decarb and a Motorvac later and the smoke disappeared. Engine runs great (stuck rings?).......

    RHW
    '90 YJ
    3" Lift
    31" Rubber
    Toy winch (really, but it does work)

  2. #2
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    sounds like valve guides. It will only smoke on star up when cold right?
    CHARLIE DON'T SURF!!
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    OF4WD#5576
    BOOYAH!!!

  3. #3
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    Quote Originally Posted by rhw View Post
    My '99 F250 4.6 liter all of a sudden started blowing smoke out the tail pipe, especially at start up.
    Took to the dealer...no codes (?)....so they checked it on the Drive Clean system in test mode. It passed!
    Hydrocarbons were up but still within threshold.
    What's the point of emission testing if an oil burner will pass?

    Couple of cans of decarb and a Motorvac later and the smoke disappeared. Engine runs great (stuck rings?).......

    RHW
    '90 YJ
    3" Lift
    31" Rubber
    Toy winch (really, but it does work)
    Limits on big trucks are rediculously high. HC usually means Cat.
    97 ZJ - Daily Driver
    93 ZJ - Parts Truck -- PM Me if you need any parts.

  4. #4
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    Yeah classic ford valve giudes.

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