Backfires

Tiny
DEJI OJOAWO
  • MEMBER
  • 2003 MERCEDES BENZ C240
  • 2.4L
  • V6
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
My car listed above backfires when I switch off the ignition. It goes on for like three to six minutes. I noticed lately that it will not backfire when I turn off the ignition when it is in drive gear but backfires in park. Please what is the solution? Thanks
Sunday, October 22nd, 2017 AT 12:52 PM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Engine is running on, can be due to incorrect ignition timing, or a hot cylinder. It is basically acting like a diesel. Lean mixture can cause internal cylinder temperatures to be very high, this condition can damage the engine. It can burn holes in a piston and I have seen a crank break due to run on. Get this looked at ASAP.
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Monday, October 23rd, 2017 AT 12:27 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,217 POSTS
Here is a guide that can help you see whats going on,

https://www.2carpros.com/articles/engine-backfires-while-running

Please let us know what happens.

Cheers, Ken
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Wednesday, November 1st, 2017 AT 6:59 PM

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