White Smoke
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White Smoke
It may have been talked about but I’m on the road and the search function is not working on my phone. My truck is blowing white smoke at idle. It clears up but what is causing this. It’s the 6.7.
Cargo Master
Joined: Oct 2015
Posts: 2,745
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From: West Virginia
Are you sure it's not steam?
White smoke is usually caused by coolant entering the combustion chamber. Unless you have a cracked block, that's not likely on a new(ish) truck.
When it's very cold outside and the engine/exhaust haven't fully warmed up, white "smoke" is very common during idle. It doesn't come out of the pipe with any real force and quickly dissipates, while actual smoke would accumulate and kind of come out in pulses as the piston(s) with the leak force the gas out.
White smoke is usually caused by coolant entering the combustion chamber. Unless you have a cracked block, that's not likely on a new(ish) truck.
When it's very cold outside and the engine/exhaust haven't fully warmed up, white "smoke" is very common during idle. It doesn't come out of the pipe with any real force and quickly dissipates, while actual smoke would accumulate and kind of come out in pulses as the piston(s) with the leak force the gas out.
Fleet Mechanic
Joined: Jan 2015
Posts: 1,377
Likes: 294
From: SE Michigan
Technically, if it's white, it's not smoke -- it's steam. That said:
Blue exhaust smoke = burning oil
Black exhaust smoke = fuel mixture rich
White exhaust "smoke" = coolant in combustion chamber
You'll get light white "smoke" early in the AM @ start up if you have condensation that has built up, but that shouldn't last for long.
If it's heavier white "smoke", don't drive it. Get it to the shop ASAP.
Blue exhaust smoke = burning oil
Black exhaust smoke = fuel mixture rich
White exhaust "smoke" = coolant in combustion chamber
You'll get light white "smoke" early in the AM @ start up if you have condensation that has built up, but that shouldn't last for long.
If it's heavier white "smoke", don't drive it. Get it to the shop ASAP.
More Turbo
Joined: Apr 2011
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From: Extreme NW Ohio
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