Question about 1995 Jeep Grand Cherokee

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I have a 1995 Jeep Grand Cherokee Limited ,when I go to start it, the relay starts clicking and the fuel pump starts pumping after about 15- 20 minutes of leaving the key on. Also the security light comes on. After the fuelpump pumps up pressure the security light will go out, then when I go to start it the RPM gauge and the injectors go wacky. The RPM gauge continues to jump all over until I turn the key off, at the same time the RPM gauge is going all over the injectors are pumping gas, the end result is, it floods and puts gas in the oil. Is it possible that the computer is going bad? We have already replaced the pick-up coil in the distributor, new crank shaft sensor, and new coil. once we get it started it runs fine.

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  • ziona Jul 14, 2010

    Jul 14, 2010 - If it were the fuel pump regulator , why would the RPM gauge go wacky until you shut the key off and then try starting it agian and then the RPM gauge does the same thing and sounds like it is not firing then all of a sudden it will start, but skip and miss until it is no longer flooded, then it runs fine.
    Jul 14, 2010 - Then when you shut it off and wait awhile you have to go through the same process as the first statement

  • ziona Aug 20, 2010

    We replaced the fuel pump regulator and we still have the same problem. There are no fuel leaks and we've gone through the whole system. We have replaced all the fuel related parts, the injector o-ring (upper and lower) and have gone as far as changing the intake manifold gasket. now I have a steady fuel pressure of 42 lbs. Now when we go to start it, it kicks back like it's out of time and tries to start on the first turnover. After that it just whirls over and then the RPM gauge goes wacky and the injectors keep pumping fuel. When we shut the key off the injectors stop until I try to start it agian. If I leave the key on for aprox.1-3 minutes it will start and run like there is nothing wrong. We have checked the voltage that goes to the cam shaft sensor and it reads 10 or more volts. We have also eliminated the security system so the car didn't go into shut down mode. Camshaft sensor and crank shaft sensor seem to check out ok. Am I looking at changing the PCM?

  • ziona Aug 21, 2010

    After spending Hundreds of $ and hours on trying to figure this out we finally broke down and went to the scrap yard and got a PCM for this car. It only cost about $30. Wish we would have done this a year ago!!!!



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Certainly sounds like a bad fuel pump regulator. You have a 95 so the regulator isn't part of the fuel pump (on 96 and newer its all one assembly.) You don't have a fuel pressure tester by any chance do you? That would be a great tool in this situation.
Here is a link to the item
It is $60.00

Posted on Jul 13, 2010

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Its a fuel cut off set off by the security you have to appease the security and turn it off to get it started!

Posted on Jul 28, 2010


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