1989 Jeep Laredo back fire and accelerating

Tiny
STOKELYWALTER
  • MEMBER
  • 1989 JEEP GRAND CHEROKEE LAREDO
Engine Performance problem
1989 Jeep Laredo 6 cyl Four Wheel Drive Manual

car idels grate when I push on then gas it back fires and miss fires I put in new pump, filter, fuelpressur regulator. Spark plugs, wires and cap look good, all hoses or good no leaks so what elae can I do to stop the miss fire and the back fireing.
Friday, April 30th, 2010 AT 9:26 PM

3 Replies

Tiny
BEEF99
  • MEMBER
  • 152 POSTS
The first thing that you should check before wasting anymore money on parts that you may not need is the timing chain. If your timing chain has slipped because of being worn, this could happen easily and is more common than you may think. Have your timing checked. Even though you may have your timing monitored by the computer, if the timing chain slips, then it will cause the problems that you describe. If you had a bent valve, this would be the case too but it would probably backfire or run rough at idle too.
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Friday, April 30th, 2010 AT 9:35 PM
Tiny
STOKELYWALTER
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  • 3 POSTS
It has new engine one and half year old I dont think it can be the timeing but I will try that it all so hade troubel with the crankshaft position sensor and gave the same prob with old owner I put new one and it still back fire
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Friday, April 30th, 2010 AT 11:10 PM
Tiny
BEEF99
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  • 152 POSTS
Check your timing anyways just to be sure. Sometimes even new engines have problems too. IF it is not the timing chain, check for pinched or damaged wires running to your sensors because during engine swaps, one of the wires may have accidently been damaged. God speed. Let us know what you find or if you need more help.
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Saturday, May 1st, 2010 AT 8:20 AM

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