No start, backfire from top of engine

2004 JEEP GRAND CHEROKEE
290,000 MILES • 4.0L • 6 CYL • 4WD • AUTOMATIC
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REBECCASFISHER
  • MEMBER
  • 1 POST
Already replaced camshaft sensor and crankshaft sensor. What else could be the issue?
May 10, 2021 at 8:08 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 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
May 11, 2021 at 1:18 PM
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