Hallo,Why does my BMW produce a cloud of smoke when i ignite.what could be the problem?

check turbo

This could be two problems occuring, 1. Head Gasket leaking intermitantly (ie) Replace Head Gasket & skim head. 2. Replace the oil separation Valve or also known as Crank Case ventilation Valve.
This valve opens & closes, can be glued shut with carbon build up. Then when engine comes under load & elevated the oil from crank vent pipe can't escape but events in burning of as white smoke.

I'd get a compression check done...

Mr.Fatodu,
according to your statement, your car is using enough engine oil. Now this depends to how often you were changing the engine oil and the guality of oil used. For me all BMW'S OIL CHANGE Every 5000 miles long drive and 4000 miles short drive. Oil used full synthetic Castrol 5W40. Since now you have the smoking issue should use an oil treatment additive FORTE For stop smoke. Trythis first and see whether you have any success.

Serious...no. A problem..yes. You may have hardened valve stem seals or a bad crankcase vent valve...either way it needs fixed.

Eventually the engine will build up burnt oil residue in the combustion chambers and foul spark plugs. It is also ******* those expensive catalytic converters under the car.

These do suffer from engine crank case vent failure quite often although this will trip a code and light the Check Engine lamp.

If the smoke is thick and white you have a blown head gasket. The car would basically look like it is making clouds.

If the smoke is black that is too much fuel and is likely the result of a failed ignition module.

sounds like valve seals

there are only two things that cause this, one and most common is the oil seals on the valve stems and excessive valve guide wear, the other is piston rings, to check this u have to have a cylinder leak-down test run to determine condition of ring seal. How many miles makes a big difference in how you look at this problem, how much oil do you use in a 1000 mile stretch?

Hi All.

I am a BMW technician and i see this problem daily. There is a filter on the top of your rockercover. it is called an oil separater or a breather filter. you can only get the filter at a BMW garage so if you go to stores and ask them for this filter they will know what you are talking about if you tell them you are after having your turbo replaced. Fit this filter and you will notice the smoke will get better if it does not go away completely you might wait another 3-4 weeks and replace it again. hope this helps.

Regards,
Shaun

Hi white smoke is produced by water in the combustion chambers do to bad head gaskets ,crack heads ,or lose cilinder head bolts,you should take it to a good tech before will cause any mayor damage .....