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Starting problem I have a 1994 jeep cherokee laredo and had a used computer put in. I had the mechanic look at it and he said it was the computer that was bad, so it was fixed. Now Im having the same problem again. The car starts but does not want to stay on, can you please help me.

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  • IntroubleNY Nov 30, 2007

    Thank you, I took my jeep to the mechanic and he changed the fuel pump and I just brought my jeep home and it did the same thing. I'm going to take your suggestion and test my battery. Thank you again.

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First of all, what type of a mechanic looked at it and diagnosed it as the "computer"? A certified dealer-type technician, or an independent shop mechanic? I ask this because a vehicle's engine ecu is very frequently mis-diagnosed when it may be something as simple as a loose connector. What exactly happens? You crank, the vehicle starts ok, then runs good for a while then dies, or dies right after starting? Does it run rough after you start it? Without further info, I'd say you may have a bad battery. The engine control unit (ecu or "computer") is very touchy, and what happens many times is that your vehicle may crank ok, but while cranking, the voltage will drop too low, and erase the computer's recent memory ( things like throttle position, crankshaft sensor variation, etc.). So when it does fire, it will not idle properly, or sometimes will not run at all. Chrysler, Dodge, and Jeeps are especially susceptible to this. One thing you can do is if it cranks then starts, rev the engine to keep it running, not mash the pedal, but hold it at about 2000-3000 rpm for 10-30 seconds and after that, gently release the pedal, and let idle. if it runs ok after that, drive it to buy a battery. If this is not the case, you may need some more serious electronic diagnosis. Look over the obvious things like your battery cables to ensure they're tight and no corrosion, also follow those cables to the starter/engine/or exterior fuse panel, and make sure the connections are good. I hope this helps. I would definitely get the battery load tested (they do this at autozone for free), and go from there. Good luck.

Posted on Nov 28, 2007

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