1987 Jeep Comanche



June, 7, 2011 AT 1:12 AM

I have a 1987 Jeep Comanche, when I start it, it will run normally for 3 to 4 min, then will backfire and die, then it will not start unless you switch off the ignition and wait 2 to 3 min, then it will start and run normally and then die again. Have replaced fuel pump, filter, map sensor, tps, IGNITION CONTROL UNIT, and coil. Do you have any other ideas?


3 Answers



June, 7, 2011 AT 3:54 PM

I saw you had been waitin' a bit.

I try not to get in over my head

I do this for fun/ learning/ and to help people!

I am very experienced with Jeep CJs and that's what I try to do mostly, none are broke at the present time, so I will see if I can, at minimum get you started on the right path. And you are a Jeep person, close enough!

Others can, and are welcome to throw in their answers!

I do sorta know thing to get you prepped and ready for someone specializing in these computer run rigs

1st, Any Historical things we need to be aware of?

Is your check engine light on. Or was on?

What about things that have been "Tinkered With" while you have been having the present issue. Give it up, don't be ashamed. We need to know, sot his will not take so long!

Sounds like you been throwing parts at it, your idea, whose? This may possibly compound the diagnoses part of this.

OK, real stuff you can do, to sorta let us know what direction to go

When it will not start (the evil period of time!), Pull a spark plug wire, stuff a nail or similar item in beside the "plug clip", then hold the wire, with the nail etc. About 1/4 inch from the block and have your buddy "turn the engine over". Do you get a good Popping or Snapping Spark? (Testing for ignition problem)

Now lets test to see if it's a fuel problem. Same Deal! We're in the NO CRANKY UP PERIOD OF TIME. Do this outside, always have a blanket and a fire extinguisher available. Spray some/ a little STARTER FLUID down the THROTTLE BODY. Then attempt a start. Even if it doesn't crank up and run. Does it try? Does it spit and sputter? Or is it still just Dry Cranking with not hope of starting?

All righty then

It's your turn now

The Medic



June, 8, 2011 AT 2:04 AM

1st of all thanks so much for replying so quickly, you also gave great advice.
This AM I went out to try it and was looking at the fuel injection wiring and behind the ECM was wiring that had landed on the exhaust manifold and burnt thru. I fixed it and now it runs great! Once again thanks so much.




June, 8, 2011 AT 2:14 AM

You owe me a monster Mountain Dew and a dozen "Krystal Burgers" cheese, mayo, and onions!

Glad your Jeep is no longer a statistic.

If you need me again, come back to this post!

Or just submit a new question for anyone here, most will help you well!

Thanks for using 2carpros---we hope not too see you real soon!

The Medic

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