Question about 2000 Jeep Grand Cherokee

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2000 jeep charokee 4 liter backfires

I changed th crank sensor and the coil packs it will start now but backfires back through the air box i do not have the cat converter on at the moment because i thought it may have been pluged any ideas

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On the older cherokee's that had a ditributor(which was none adjustable), the computer seet the timing. The computor would also cause the backfiring due to incorrect timing, On these modles you could remove the distributor, cut off the ends of the fork that went overe the stud that locked it in place and the install the distributor and adjust it , It would run great. Newer models with coil packs, you possibly have a sensor causing a bad reading to the computor or a faulty computor.

Posted on Dec 29, 2010

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Put a vacuum gauge on it and see if you have a steady reading. You may have a bad cam lobe or partially burned valve which will show up as a quickly fluctuating vacuum reading. Backfiring is generally caused by the above or by the ignition being too far advanced (yours is not adjustable but if you had the distributor out?, you may have put it in one tooth off.)

Posted on Mar 05, 2009

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