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Bad backfire and mist

Tiny
CADAMS1004
  • MEMBER
  • 2000 JEEP CHEROKEE
  • 4.0L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
Had changed the head gasket, intake gasket, throttle body, and the intake manifold. New plugs. At first it was idling really high like aggressive high then we took out the electric ignition an put in a distributor an the idle calmed down and still have the backfire. Please help.
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Thursday, September 13th, 2018 AT 6:21 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,200 POSTS
Hi and thanks for using 2CarPros.com.

A backfire can be caused by a few things. First, take a look through this link to see if there is anything helpful.

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

Next, I need to know if the cylinder head was checked for cracks. 1999 and 2000 are known for the cylinder head cracking between cylinders 3 and 4. Make sure there is no indication of a leak. I would also recommend checking the compression to see if there is an issue.

Let me know,
Joe
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Thursday, September 13th, 2018 AT 8:22 PM
Tiny
CADAMS1004
  • MEMBER
  • 2 POSTS
Thanks for getting back. The engine is a 4.0, straight six.
And everything you have mentioned we had checked and everything was okay. No cracks with cylinders, and the compression in it was good. No leaks anywhere.
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Friday, September 14th, 2018 AT 5:28 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,200 POSTS
Is it backfiring through the exhaust or intake?
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Friday, September 14th, 2018 AT 7:08 PM

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