Question about 2000 Jeep Grand Cherokee

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I have a miss fire on cylinder #1 & #6 any one can help me ?

Motor runs fine until 80km per hrs
then , the motor start to buck until 100 km pre hrs if I go over that speed , runs fine
Can some one help me
thank you

Jean

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  • Anonymous Mar 01, 2009

    Hi

    Yes it is a 6 cylinder 4 liter

    Here is what I had done so far to try solve the problem

    1 ) the oxygene sensor was changed
    2 ) the fuel filter changed
    3 ) the spark plugs all six
    4 ) the coil pack changed ( 3 times )
    5 ) the air filter
    6 ) I also change the o rings of the injectors
    7 ) We cleaned the compression chamber ( with appropriate stuff )
    8 ) all vacuum were checked

    What do you guys think it could be now Please I need your help

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  • Jeep Master
  • 6,982 Answers

Since #1&6 are the furthest from the center of the manifold (if it's a 4.0) I'd suspect that either the manifold gasket is leaking a bit and leaning out both cylinders, or you have an ignition wire that has worn through a bit (in this case either #1 or #6)and they are either crossing or in close proximity to each other permitting cross fire.(not extremely likely but possible) The other item I'd check is your fuel filter. A partially plugged filter will cut down on delivery, effectively lowering available fuel when you need it most (pulling in mid range) Also, make sure your air filter is clean!

Posted on Mar 01, 2009

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