anothadayridin

Ok I'm back unfortunately. When I'm driving. My Jeep. My gauge goes irratic n the truck stalls after driving. Awhile. I end up with no spark. So i let it sit 10 minutes. It starts and runs fine again awhile. And does the same thing. Just started. This 2 days ago I'm guessing. Coil or icm ???

cruiser54

Or a weak CPS.

Test it.



Renix CPS Testing and Adjusting
　
　
Renix CPSs have to put out a strong enough signal to the ECU so that it will provide spark.
Most tests for the CPS suggest checking it for an ohms value. This is unreliable and can cause some wasted time and aggravation in your diagnosis of a no-start issue as the CPS will test good when in fact it is bad.
The problem with the ohms test is you can have the correct amount of resistance through the CPS but it isn’t generating enough voltage to trigger the ECU to provide spark.
Unplug the harness connector from the CPS. Using your voltmeter set on AC volts and probing both wires in the connector going to the CPS, crank the engine over. It won’t start with the CPS disconnected.
You should get a reading of .5 AC volts.
If you are down in the .35 AC volts range or lower on your meter reading, you can have intermittent crank/no-start conditions from your Renix Jeep. Some NEW CPSs (from the big box parts stores) have registered only .2 AC volts while reading the proper resistance!! That’s a definite no-start condition. Best to buy your CPS from Napa or the dealer.
Sometimes on a manual transmission equipped Renix Jeep there is an accumulation of debris on the tip of the CPS. It’s worn off clutch material and since the CPS is a magnet, the metal sticks to the tip of the CPS causing a reduced voltage signal. You MAY get by with cleaning the tip of the CPS off.
A little trick for increasing the output of your CPS is to drill out the upper mounting hole to 3/8" from the stock 5/16", or slot it so the CPS bracket rests on the bell housing when pushed down. Then, when mounting it, hold the CPS down as close to the flywheel as you can while tightening the bolts.

　
　
Revised 01-26-2013

anothadayridin

How often are brand new ones bad?

RTorrez1

I have to agree with cruiser. It sounds like it is your CPS.

It all depends. If it's a after market one from a chain parts store they can go pretty quick if they work at all. If you need to replace it get it from an OEM one from dealer.

RTorrez1

Double post.

cruiser54

Cheap ones are often bad off the shelf as stated in my write-up.

Test it. If the aC output voltage is around .2, you may be able to do the drill mod and it will work fine.

anothadayridin

Came from Napa. Would. It. Only do it while. Warm ? BC it starts and runs fine while cold

anothadayridin

Then it starts up. Runs. A moment while warm or at 210 and then rpms. Goes and it dies

anothadayridin

And would a leaky valve cover cause CPs issues? Oil is all overcthe. Trans

cruiser54

CPS failure is heat related usually. Test the output and we'll go from there.

anothadayridin

Ended up being. The I'm it was 25 years. Old. So I guess it was its time

RTorrez1

???
So you not going to tell us what it was??? LOL

jakbob

This thread is encrypted in a weird grammar. I think he is telling us, but we just don't understand.

Lol

RTorrez1

Good! I thought that I was going brain dead...LOL