Backfires

2003 MERCEDES BENZ C240
120,000 MILES • 2.4L • V6 • 4WD • AUTOMATIC
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DEJI OJOAWO
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  • 1 POST
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
Oct 22, 2017 at 12:52 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
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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.
Oct 23, 2017 at 12:27 AM
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STRAILER
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  • 54,837 POSTS
  • ASE Certified Mechanic
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
Nov 1, 2017 at 6:59 PM
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