No Spark

Hmmm. I didn't try the camshart sensor, just the Crank shaft sensor, I think. It's on the bell housing. Where's the camshaft sensor?

No codes.

It's on the passenger-side where the distributor used to be. The distributor is gone on late model TJ 4.0L engines but the camshaft sensor should still be there being driven off the old distributor shaft IIRC.

Jerry

Fred Garv> Hmmm. I didn't try the camshart sensor, just the Crank shaft sensor, I

Fred - do the diagnostic code thing and then tell us what is comes back with. Starting with the ignition off, turn the key on-off-on-off-on in a nice even cadence, then look at the odometer. This is where the Jeep tells you what ails it if it has anything to say. If it has nothing to say it will just say 'done'. If the computer has picked up an error in the system it will show a code or a series of codes. Write them all down and post them here - the folks here will tell you what they mean.

This is easy and free and if it shows codes the answer (or at least a good clue) is handed to you rather than chasing the problem by replacing parts that might or might not be problematic. Do it. Tomes

Thanks, Tomes. The only thing I received was "Done."

I'm going after that next. I'll let you know.

A broken ground wire can cause no spark. The main ground is a mesh strap from the engine head to the firewall and the computer grounds are on a bolt on the passenger side by the oil dipstick.

Mike

Fred Garv>

Mike Romain did pass the time by typing:

On the newer I6 the ground strap is a large gauge (2?) stranded copper wire that runs from the coil mounting bolt to the frame. Front passenger side of the engine, hiding behind the alternator. You can see the fat wire and just barely part of the connector in this pic from my 93

Ah, bummer that it did not help though. It was worth a try and now you know for the future as well. Good luck with this. Tomes

You nailed it! It was the camshaft sensor. It's running great. Thank you, Jerry. And thanks to all! This is a great group.

Interesting. The older engines also have a strap from the engine to the frame along with the one from the engine to the firewall.

You must have 'something' grounding the body of the vehicle. At least a cable from the battery negative to the fender.

Moot in this case anyway, the OP had a bad CPS it would seem.

Mike

DougW wrote:

Awesome, a lucky guess. ;)

Jerry

Fred Garv> You nailed it! It was the camshaft sensor. It's running great. Thank you,