Question about 1997 Jeep Grand Cherokee

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Runs great but, occasionally, misses a beat, usually on long trips of several hundred miles. Happens in clusters of 3-4 over about 1 or 2 minutes. Then runs great for remainder of trip. I cannot detect a pattern and it may go 1,000 miles between blips. Feels like water in the fuel but I have been adding gas treatment regularly and using premium fuel to counter this. Still happens occasionally. Any ideas?

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  • ftrinnaman Oct 11, 2010

    Don't know yet. Will check it out.

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  • Jeep Master
  • 2,984 Answers

Okay, I can't see any other fixes posted to you but I can tell you this from past experience on the same model, different year and on a few other models. The fuel pump is an issue. It is not the fuel filter or MAF sensor or the IAT sensor....the fuel pump was the cause. Now, on a Dodge Stratus/Cirrus/Beeze....it was the ECM.

I would inquire about the fuel pump first. These are the signs with the "seems like water..." when the vehicle is running like that. You can also have the ECM interrogated also to eliminate unnecessary "swapping" of parts...wasting money on the "well that didn't fix it." $80-85 is the average to troubleshoot the ECM.

In the long run, it is worth the initial cost because the ECM is what sends the messages to everything. The connectors, also, at the ECM are prone to be garbage from the factory.

Posted on Oct 11, 2010

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