Smoke on acceleration?

Tiny
BHAMDOC1973
  • MEMBER
  • 2007 BMW 328
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
Only upon hard acceleration while downshifting I see a bit of smoke, could old spark plugs cause that?
Saturday, May 18th, 2024 AT 2:50 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

It's unlikely the spark plugs would cause it unless they are not burning all the fuel. When you notice this, can you tell what color the smoke is? For example, dark gray or black would indicate too much fuel and blue would indicate oil burning.

Here are two links that better explain:

https://www.2carpros.com/articles/blue-smoke-from-engines-exhaust

https://www.2carpros.com/articles/engine-black-smoke

Let me know.

Joe
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Saturday, May 18th, 2024 AT 9:00 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Definitely not black or blue. White or grey but there is coolant leaks or drop in level.
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Sunday, May 19th, 2024 AT 4:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

White smoke usually indicates coolant is getting into the combustion chamber and being burned with the fuel. Take a look at this link and let me know if anything mirrors what you are experiencing:

https://www.2carpros.com/articles/recognizing-the-symptoms-understanding-a-blown-head-gasket-in-your-vehicle

Let me know.

Joe
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Sunday, May 19th, 2024 AT 7:03 PM

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