Question about 1988 Jeep Cherokee

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Jeep Cherokee won't start, turns off, etc.

I have a 1988 Jeep Cherokee 4.0.  Motor replaced three years ago, but I have had this problem the whole time.  It sometimes cranks and sometimes doesn't.  If it wont crank, I can sometimes crank it with a little ether, other times it won't crank at all.  I took it to the dealer a while back, and was told to replace the throttle position sensor. didn't work.  injectors are good, always have fuel coming through, spark is good, coil is good.  Tried cleaning out the throttle body intake really good.  I have no clue what else to do.  It will turn over but will not crank every time.  It also can turn off if I slow down to turn or stop.

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  • hunterh10 Oct 20, 2009

    The problem did not start until the motor was replaced. The motor I had put in was new... so i'm kind of looking around blindly for the problem?



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Did you have the same cranking with no start problem with original engine or did the problem begin when you changed it? I would check codes if you have not already, and would also clean business end of idle air valve (next to tps) DO NOT turn the end plunger while cleaning or it may not seat properly. Do not loose the rubber "o" ring while working either!

Posted on Mar 02, 2009

  • Richard Scordino Oct 21, 2009

    You posted that you had the problem the entire time...then 6 months later you say you only have the problem after the engine swap. When an engine is "cranking" that means it is turning when you turn the ignition key. Starting is what happens after it is cranking. Likely you have a fuel problem. you know there is fuel at the rail but you can't see it going through the injectors. Generally when I give advice I stress the importance of using a digital multi-meter and doing accurate testing using a manual (even chiltons and haynes list decent test procedures. Doing those tests is far better than blindly attempting to diagnose the problem. You could have a bad pump resistor, a leaking injector or even a bad temp sensor or intake air temp sensor....All these items (and more) contribute to how your car starts....especially cold, the fuel mixture needs to be exact. You could also have an intermittent disconnect in a power lead. But, I'll bet since you first posted in march, you haven't tested much of anything. You swapped the engine but how many of the sensors did you re-use??? The engine is not bad, a control is bad.



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