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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Lots of white smoke/steam when cold
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      03-03-2023, 05:04 PM   #1
RuthlessG123
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Lots of white smoke/steam when cold

Hello!
I've got a f11 520d xDrive, 2017.

I noticed that when the car is cold, it will blow a lot of white smoke or steam out of the exhaust.
It's odorless and quite thin, but what concerns me is the amount of smoke coming out.

If i'm parked, the smoke will become almost clouds around the car, and during acceleration, a cloud of smoke is blown behind the car.

When the engine is warm, all of the smoke will disappear and it's like nothing is coming out of the exhaust anymore.

Is this normal behaviour, or could there be an issue?
Thanks!

Last edited by RuthlessG123; 03-03-2023 at 05:25 PM..
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      03-10-2023, 09:02 PM   #2
Thecastle
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I had a diesel blow lots of white smoke on a cold start.

White smoke is unburned diesel. When I mean smoke I mean a lot not whisps.

My diesels glow plugs where bad and white smoke is unburned diesel fuel coming out the exhaust.

Replaced glow plugs and glow plug module, starts good and no smoke.

This was a Ford 7.3 powerstroke.

my diesels do not give off visible water vapor 6.7 cummins and 7.3 power stroke. Only my gas cars do. the diesels drip some water out of the exhaust but thats it. My 335d never gave off white smoke
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      03-15-2023, 09:12 PM   #3
RuthlessG123
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Quote:
Originally Posted by Thecastle View Post
I had a diesel blow lots of white smoke on a cold start.

White smoke is unburned diesel. When I mean smoke I mean a lot not whisps.

My diesels glow plugs where bad and white smoke is unburned diesel fuel coming out the exhaust.

Replaced glow plugs and glow plug module, starts good and no smoke.

This was a Ford 7.3 powerstroke.

my diesels do not give off visible water vapor 6.7 cummins and 7.3 power stroke. Only my gas cars do. the diesels drip some water out of the exhaust but thats it. My 335d never gave off white smoke
Thanks for the tip, I will keep the glow plugs in mind
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      03-15-2023, 09:58 PM   #4
ezaircon4jc
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Quote:
Originally Posted by Thecastle View Post
I had a diesel blow lots of white smoke on a cold start...
You should see an L1011 light-off in the cold!
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