No start, backfire from top of engine

Tiny
REBECCASFISHER
  • MEMBER
  • 2004 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 290,000 MILES
Already replaced camshaft sensor and crankshaft sensor. What else could be the issue?
Monday, May 10th, 2021 AT 3:08 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

If you are getting a backfire through the intake, it could be a stuck or burnt valve. Also, a rich fuel mixture can cause a backfire as well. Timing is another possible cause.

Was there anything that led to this happening or did it happen all at once?

Let me know. Also, take a look through this link and let me know if it helps:

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

Take care,

Joe
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Tuesday, May 11th, 2021 AT 8:18 PM

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