Question about 1994 Jeep Grand Cherokee

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My 94 jeep grand cherokee is having fuel injection problems i think. During hot days it will be driving along just fine with my foot on the gas and then it feels like(under my foot) a garden hose when you bend it and its trying to get the water through, then maybe 10 seconds later it corrects itself and its fine again. It happens on both hot and cold days but seems to do it WAY more on hotter ones. The check engine light has been coming on lately alot too. I am always up on my fluid levels though. Im wondering if maybe being black has something to do with it or because its over 200000 miles something needs to be replaced. Please help!

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  • angelinamenn Jun 07, 2010

    thank you. i really hope its not the catalytic converter. The heat does actually set off the alarm though. when its foggy or colder, its fine but if its over 80 and in the sun, it will go off. Could that be the reason for the whole gas pressure bit too? The whole catalytic converter thing? Not the throttle positon sensor?



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By the time you reach that kind of miles, chances are you have one or more engine control sensors that are out of range. Since the check engine light has been coming on, have the codes read (most larger parts stores do that free) It's also possible that the catalytic converter in the exhaust system is beginning to plug up. if so that acts as a restriction to flow and can seriously hurt performance.
Vehicle color does not have a lot to do with the problem though some items such as door switches can act that way in darker vehicles, but there needs to be a problem there already for the temp change to affect it.

Posted on Jun 07, 2010

Testimonial: "thank you"

  • Richard Scordino Jun 07, 2010

    All components are expensive. I never replace anything without doing some testing first. When I mentioned sensors, I actually wasn't thinking of TPS but more along the lines of O2 or MAP sensor. However, they all work together and good tests are the only real way to determine what's going on. You could also have a partially obstructed fuel filter but your symptoms don't exactly match.
    With computerized systems the computer will often adjust to a malfunction and cover up the real problem so, in order to find what's wrong, you need to test. I cannot do that from here!
    Code scan, follow up with testing with a digital multi-meter and a decent manual such as chiltons.
    I do attempt to point people in the right direction even if I can't give you a definite item to replace.
    Ratings are often nice though!



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