Question about 1994 Jeep Grand Cherokee

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Jeep just shuts off and also seems like it has loss of power.

I have a 1994 Jeep Grand that just shuts of when driving or idleing. It does start right back up after it shuts down. I have hooked up a fuel pressure reader and it reads normal at idle speed and when it shuts down it doesn't lose and pressure. I left the pressure reader on over night to see if it would lose any and it did. It went to 0. The jeep also seems as though it has a loss of power. If the Jeep is on cruise control and you are going over a hill, it practically floors itself so it can make it. As you gas it, it just seems to lose power not gain much. I changed the "tps" thinking that was the problem and it helped a little but it has to be something else. My guess is a mixture of possible fuel filter/pump and "cps". If anyone has any guess it would be greatly appreciated. Thanks soo much for your time.

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  • lilwhitedove Jun 18, 2009

    Fuel pressure regulator is fine. I didn't buy it from the dealer It was a personal buy. I have had it for 4 months now and this is just starting. The check engine light works and when I check it for codes it says nothing is wrong. I haven't checked the fuel filter yet because I was for sure it was the fuel pump so I was just waiting for it to go out. But it hasn't yet.



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Have you check your fuel pressure regulator,check fuel filter,or take back to dealer to see if there is any faults stored in car computer,could have faulty wiring

Posted on Jun 18, 2009


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in a perfect world, computers and related systems are a great addition to the automotive industry...But, You would not dream of using your PC in the backyard, in the rain, snow and searing heat. Yet the system in your car is asked to do that daily. (would be nice if a little button like on a chicken would pop out of a failed component to tell you it's not well.....Your guesses are valid, but before you go out and buy parts, have a code scan done and see what's there. Codes give you a direction to begin looking, they don't get really specific, but when added to what you already see and know can be very helpful. Fuel pump problems don't show codes though so you may need to do a pressure test. CPS will sometimes throw a code, but they can also cause strange problems without doing that. The largest problem I see right now is that it starts right back up, giving you no time to do testing. The random on/off thing suggests the possibility of a bad connection either at the computer or ignition switch. You can try wiggling the harness a bit and see if you can get it to stall.
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