white smoke from tail pipes?

[aasim305]

Hello
I have an 2006 m45 it throws white smoke out the tail pipe when revved. i cleaned the pcv valves and both valve covers still the problem is there the car is not overheating. the car has a little miss fire but no check engine light. Anybody know what this could be please help??

[antzrus]

Exhaust...

[myother45isalesbaer]

White smoke or white vapor? Is it blue or black? White vapor is usually just steam as you get that exhaust system hot and blow out the condensation that accumulates in all exhaust systems. You can tell the difference as smoke hangs around, vapor just disappears.