Hi all, i have a bmw 520d. When i leave the car over night or when it has been sat for a while when im at work i start it and it has a misfire with lots of white smoke. I accelerate the engine once or twice when and the smoke clears and does not come back until the car has been off and cooled down for a while. I have changed the glow plugs this had no affect maybe even made it slightly worse in the morning. Please help
Does the white smoke have a diesel smell or an engine oil smell?
Not all 520d are alike, so you will have to help us with details.
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
- 2003 VW Jetta TDI Manual 47-50mpg
- 1999 S52 Estoril M Coupe
- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
- 2019 M2 Competition, self-tuned, 504whp
- 2016 Mini Cooper S
I think its more of a diesel smell but not 100% sure. Its defintly got a chemical type smell. Its the e60 model n47 engine 2.0l 177bhp version
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I have checked oil filler cap there is no oil/water mixture gunk. No warnings on the idrive and no fault codes when i plug in my diagnostic scanner.
In a diesel it could easily be unburned diesel vapor too, especially if it stops so quickly.
I would use diagnostics to find out which cylinder/s are rough and pull the injectors. Is check engine light on?
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
- 2003 VW Jetta TDI Manual 47-50mpg
- 1999 S52 Estoril M Coupe
- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
- 2019 M2 Competition, self-tuned, 504whp
- 2016 Mini Cooper S
Hi thanks for the reply. I relieved pressure last night the smoke is the same this morning. No mayo type stuff in the oil fill cap but i did see a tiny stream of bubbles in coolant reservoir. Would the car not run weird if head gasket was blowing
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Hi thanks for the reply there is no check engine light and no faults on the idrive car runs great after the smoke has cleared
That head gasket sealer in scan will clog up the cooling system. Don’t do it.
Thats what i though not worth the risk as i actually want to keep the car.
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Went to the garage he seems to think ita not gaskets but turbo related. Wouldnt it constantly smoke if the seals was on the way out? After more research i am leaning towards bad valve stem seals any thoughts on this
I changed the oil and filter over the weekend. When i was under the car i noticed oil and soot running down the pipe coming from the turbo. Does that mean that i have an oil leak in the turbo?
Yup! The turbo’s oil seals are bad. Replace the turbo with a rebuilt unit.
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