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What causes smoke when start engine?

Updated: 10/22/2022
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Esmith08

Lvl 1
14y ago

Best Answer

It can be caused by excess oil in you exhaust and also if you have diesel engine it is notorious for smoke.

If it is only when you first start the car, the valve seals are leaking. When you shut the car off, oil that is on the valve runs down the stem of the valve and into the cylinder. When you start it next time one or more cylinders have oil in them and it burns the first time that cylinder fires. There isn't enough leakage for it to smoke all the time while driving.

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