Question about 1997 Jeep Grand Cherokee

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Ill start fine for a couple days. Then won't start unless you hold down gas pedal and keep rpms up so it won't die. Smokes under hood. Sometimes sparks. Sometimes backfires before it will start. Sometimes starts just fine. wi

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  • aleesia_mom Nov 10, 2010

    I have alredy changed the fuel pump maybe I got a bad one? any other things that might cause this problem?

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  • Jeep Master
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I believe you have a electric fuel pump module (pump and sending unit is called the fuel pump module) that may be sticking (we call this a "lazy" pump) and causing this problem, in order to confirm that the fuel pump is the problem buy a can of spray starting fluid, and the next time it fails to start remove the air intake hose to the engine, spray in starting fluid and see if it fires off without holding the gas pedal down, the engine should fire up right away, and most probably stay running due to the fact the increased system voltage wakes up the lazy electric fuel pump, if that is the case you will need to replace the fuel pump.

Replacing the fuel pump module is shown with pictures at the web site below, I can't beat the pictures they are better than any manual diagrams..

http://www.howstuffinmycarworks.com/97_Cherokee_fuel_pump_1.html

Posted on Nov 10, 2010

  • yadayada
    yadayada Nov 10, 2010

    I really wish you would have mentioned that the pump has been replaced then I wouldn't offer redundant information but lets move on here. Have you had the system tested for fault codes? if not go to any Kragen auto parts or Autozone and have them run a "OBD2" fault code test.

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