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    jrob's Avatar
    jrob Posts: 1, Reputation: 1
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    #1

    Dec 18, 2007, 05:52 PM
    Smokes when started
    What causes a vehicle to smoke when it is first started?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Dec 18, 2007, 09:19 PM
    The valve seals likely need to be replaced.
    kitch428's Avatar
    kitch428 Posts: 1,440, Reputation: 152
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    #3

    Dec 19, 2007, 09:14 PM
    As the engine settles down from driving, the oil that has puddled in the cylinder head will drain back down into the oil pan. But some will remain on top of the valves and springs. There are umbrella type seals that fit snug up against the valve stems sticking up through the head. These seals will get very hard over time and start to degrade.
    Oil seeps by them and ends up wetting the combustion chambers. When the next start up occurs, the oil is quickly burned and a big puff of blue smoke will exit the tail pipe.
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