Question about 1991 Jeep Cherokee Briarwood

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Stalls after 10 mins of driving and back fires when starts

Just put in a different motor, and had a problem with the computer, so i installed one from a 91 wrangler, and it runs fine for awhile and after 10 mins of driving it around it will stall and when u try and restart it, it will run, but misses and back fires, but if u let it sit for an hour, it will start right up with no problems??? any advice??

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  • goehringrory Jan 17, 2009

    no, the computer came out of a friends jeep that he had a while back, the one that was in it was fried and would not let it start, mines a 94 a/t and the one that we put in there was out of a 91 m/t, it runs fines for 10 mins and after that it will stall, and when u start it back up it back fires.

  • Tim Higgins
    Tim Higgins May 11, 2010

    did the computer come with the engine?....if not it may not run that engine correctly

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  • Jeep Master
  • 6,982 Answers

Providing that all sensors on the new engine match what you had on old one, You must match the computer to the vehicle it's in. (the computer for my 91 will not run my 95, but the 95 will operate the 91, even though both units appear to be identical) Most scrapyards and parts dealers, have a list of what fits what. Unless the motor you swapped in was a known good one, I would also suspect a possible problem such as a worn timing chain, but definitely would not investigate that 'till you have the correct control system in place. If your old computer was "fried" you must also determine the cause of that condition before putting a new one in, or you could damage that one too.

Posted on Jan 17, 2009

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