Question about 1998 Jeep Cherokee

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1998 Jeep grand Cheroke hard cranking, sputtering, rough idling

I have changed the coil, computer, crankshaft sensor, camshaft sensor,
fuel pump, TPS, and cleaned the throttle body. Pleae help

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  • 2 more comments 
  • howbee Jul 28, 2009

    I am getting a CODE p1391 LOST OF CRANK. oXYGEN SENSOR RUNNING ABOVE 1 VOLT.DOWN DRAFT OXYGEN SENSOR 80-1.15

  • howbee Jul 28, 2009

    1998 Jeep troubleshooting.

  • Richard Scordino May 11, 2010

    your last post made no sense...was that an accident?

  • Lemming Leejn
    Lemming Leejn May 11, 2010

    With what exactly? You need to disclose what the problem is, in order for us to help:)

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  • Jeep Master
  • 6,982 Answers

In READING what you wrote, it appears that your car is difficult to start and pretty much is rough while running....It also appears that your are randomly replacing parts...How did you verify that the parts your have replaced had failed? I suggest you get a basic manual like chiltons or haynes as well as a decent digital volt/ohmeter, then do some testing. Pay close attention to map sensor test and manifold air temp. Having a good fuel pump does not insure that your injectors are clean enough to deliver a good spray pattern This will not show up on any test...you need to actually look at them. There are other items to look at but I think you will likely find your problem in what i mentioned. (you already checked for vacuum leaks, right?)
Good luck!

Posted on Jul 27, 2009

  • Richard Scordino Jul 28, 2009

    Do cps first, ignore O2 for now...test for cps may show good if its running OK during test. cps fails far more often than cam sensor, O2 sensor often reacts to engine problems rather than actually being bad, but, keep it as an option.

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