Question about 1999 Jeep Grand Cherokee

2 Answers

Car turns over but won;t stay running

Same here- I replaced two re- programmed PCM"s ( computer) and oil gauge still does not work- my husband replaced the oil sensor gauge and now it wont run at all. Starts. but won;t run.

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  • ddeyton Sep 08, 2009

    Clarification: The car has been bucking/ dropping whatever you want to call it for months- going at high speed (70mph) it would sharply drop down to 30 mph then spike back up. At times- all of a sudden the fuel tank gauge goes to zero and my fuel light pops on even when full. After we replaced PCM (told by dealer that was problem and was told by Auto Zone that the alterabtor was also showing bad) we replaced both of those- and had a new fuel filter and fuel injection cleaning and all new spark plugs.
    The problem continued and now happens even at low speeds, at times I can't get "up" to 40mph, it's "bucking" so badly. Then suddenly this weekend after they replaced the oil pressure sensor (only because it went out when the new PCM"s were installed- not because we thought it would solve any problem) and checked ground straps and fuses, it cranks but won't stay running. We took to mechanic who has system that scans each individual part for failure and they stated it was MAP sensor (PLEASE NOTE: no check engine light or diagnostic codes have ever come on throughout this 8 month ordeal which makes it difficult) so they replaced the MAP senor Sunday and it still won't stay running..what next? fuel pump, pressure etc...all read GOOD. They are trying/ checking ignition switch supposedly today

  • yadayada
    yadayada May 11, 2010

    u are replacing the wrong parts.

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Just because a computer is re-programmed does not mean it does not have an internal fault. The question really is who diagnosed this in the beginning. Most likely you have a issue that is not related to the computer. The exact symptoms need to be stated before anyone ever touched the vehicle. Now that you have messed with things its going to take alot more time to go backwards and figure out the new problem before we can eved address the old one. You will need a scanner to read data to see what information is not reaching the PCM. This may of been a fuel delivery issue in the beginning or an idle air control valve issue. No way to tell without test equipment. Not even the best mechanic can diagnose accurately without hand on. Even so they make mistakes and recommend wrongs parts so with this in mind you need to be aware that all we can do here is suggest parts which can get pretty expensive in the long run.

Posted on Sep 08, 2009

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Jeeps that roam rough roads tend to shake things loose. Suggest going to the fuse box, remove each fuse and relay, replacing each part as it is pulled--that re-seats each part and wipes the contacts clean. Remove the battery connectors, clean the posts and connector interiors, apply anti-corrosion grease (from the auto parts supplier) to both surfaces, and reinstall the connectors (wash your hands after this to prevent mysterious holes in your clothes). This should set the check engine light on (battery-removed code). If it doesn't, verify that the light appears when the key is first turned on. Loosen every ground connection you can find, rotate the wire connector(s) and re-tighten. Check the electrical connections at the fuel pump port in the fuel tank. Listen at the tank while someone turns on the key (don't attempt start)--the pump should run for a moment or two, then stop. If it keeps running, the pump is likely worn out and should be replaced. Rent a fuel pressure test assembly, and check the fuel pressure at the test port (looks like a tire valve) on the fuel rail over the injectors with engine running--you should measure about 45 PSI. A much lower reading implies a worn out pump or a defective pressure regulator (which is part of the fuel pump package). All of this may not fix anything, but it eliminates a number of possibilities.

Posted on Sep 08, 2009

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