1989 wrangler 4.2l. driving home and it died on me tried pop starting it while i was coasting to a stop and nothing. towed it home and poured some fuel in the carb and nothing. checked for spark and i have no spark so i picked up a new coil still nothing. when the key is in the run position i have power to the coil terminals but nothing after that. any suggestions would be greatly appreciated. maybe its possible the new coil i picked up is defective??? it cranks over just doesnt fire up.
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I'm not real familiar with the older ignitions, yours the older Renix system while mine is the OBD-1 (computerized). But I do think that yours has an ignition control module, very similar to the old Ford Duraspark boxes. And they say that it burns out often. Might want to have a look at that or wait for somebody with another 1989 with the 4.2.
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I am vaguely familiar with the old Renix system. I owned an '88 Grand Cherokee years ago. It had a TDC sensor IIRC which is what we now call a crank sensor. If it goes bad you probably don't get any spark (or fuel?) either since the ECM gets no report of flywheel movement so the ECM sends no signal to the ICM which in turn won't fire the coil.
The ICM may very well be the problem. But if you swap it out and it still won't fire I would check the TDC sensor next. It is mounted on the left side of your bell housing much like the cranks sensor is nowadays.
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Have you found anything yet ? Just out of curiosity what carb are you running ? Did you get the ICM checked to see if it's working properly ?
My last ICM lasted 10 months- switched it over to the GM style. I like $28 better than the $70 advanced auto wants.
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