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Question about exhaust fumes

RBSilvy85

By RBSilvy85
in Troubleshooting & Recalls

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RBSilvy85 Enthusiast

RBSilvy85

Posted
Posted

I've noticed that whwn my truck is sitting and idling that it exausts white fumes from the tailpipe. Now I have become used to that when it's colder out, but today it is 75 degrees and it was still doing it. Is this normal or am I burnig oil?

fondupot Senior Enthusiast

fondupot

Posted
Posted

Was the truck sitting for a while before? Could have just been condensation boiling off in the motor/exhaust pipe. Did it go away after a little while?

pm26 Senior Enthusiast

pm26

Posted
Posted

An oil burner will typically belch white smoke at all times, even when fully warned up. Also, high mileage vehicles occasionally emit a puff of while smoke after initial startup because the oil control rings on pistons are worn and some oil seeps into the combustion chamber. You should not see anything like this with a new engine.

SurFire Enthusiast

SurFire

Posted
Posted

White "smoke", which is actually steam, is indicative of moisture such as condensation build up if it happens when first starting engine, or coolant when it is constant and in greater quantities. Burning oil presents as blue smoke.

Gabe63 Enthusiast

Gabe63

Posted
Posted

The old rule of thumb is that for every 1 gallon of fuel you burn the engine produces 1 gallon of H2O, water. This is part of the chemical reaction of the gas, hydrogen, CO2, and product of combustion. I think that ratio may have changed with new emissions but you will see water come from every cold tail pipe, not sure if this is what you are seeing but it happens.

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