Question about BMW L7

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White smoke from the exhaust when I start the car

Once the smoke clears the car runs great.

My car is a 1999 740iL with 140,000 miles.

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  • Bernie Sanchez Apr 01, 2009

    The solutions offered were what I have been getting from mechanics. This person knows what he is talking about.

  • Anonymous Mar 22, 2014

    Car smoking all of a sudden

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  • Master
  • 8,619 Answers

Hi!

What type of smoke can you see---

white smoke-
If you see a wispy, lingering white smoke that has a bittersweet smell, this is an indication that your car's engine coolant is leaking into the combustion chambers. This may be due to a leaky head gasket, or in a worst case scenario, a cracked cylinder head.

Make sure to take your car to the shop right away to get it fixed.
Thick white smoke---
If your vehicle is belching white smoke upon start-up, it is a sign that transmission fluid is entering the combustion chambers, possibly though a vacuum tube that connects the engine to the transmission.
This type of smoke can be confused with the normal puff of steam during start-up. If you are not sure, have your car inspected at the shop.

Blue/White Smoke--
A blue/white smoke is an indication that oil is being sucked into the combustion chambers through the valve guides. A quick fix for this problem is by replacing the valve seals. Valve seals are small, umbrella shaped pieces of rubber.

Do rate the solution.

Thanks
Rylee.

Posted on Feb 09, 2009

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