Probably have heard this one before I have changed cps cap wires plugs batt starter but I can start it run as long as I want no problem but after I shut it off it won't start till it cools down I am getting very frustrated with it can anyone help plz!!!!!!

 

First thing we need to know is what are you driveing. Such as year, model, engine. When it wont start you need to verify what are you missing fuel, spark or air.

 

It's a 1990 2 door 4.0l auto I have tried cleaning ground wires and cps cap rotor plugs wires starter but it has been an ongoing thing since previous owner but if you go out to start it in the morning it's like its brand new starts perfect runs good but as soon as it gets shut off it will just crank over I got lots of fuel going to the injectors and have seen spark and I have checked nss wiggled the shifter wile trying to start I have read lots of forums but I am lacking a multimeter to test cps ext ext

 

TEST the CPS.

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

 

X2^. Just for fun, until you get your hands on a meter try just unplugging it and plugging it back in while it's hot/no start. Back in the stone age I had painted my mom's connector white, so she could point it out to a helper. Often that worked to get going. (no idea why).

Btw, welcome to the United States! Your English could be better, but you're learning!

 

Thanks for the info I am going to get a meter ASAP and I have tryed to unplug it and unplug it wile hot never does anything ...

 

Even the $5 cheapo-meter will work, for while at least. It won't do anything without that "hart-beat", from the CPS.

 

Hey so I got a multimeter and it reads 195 when not cranking but doesn't show anything when cranking stumped and getting really Pissed off I took the cps off drilled the holes bigger moved it closer to the bell housing still nothing and I pulled my computer and cleaned wire harness I have cleaned all grounds and everything changed the coil and switch it back still no start but here's the thing say I go out In the morning I can start it no problem than drive around perfect never have an issue than shut it off and will not start right away but you will not hear the fuel pump kick in try and crank and nothing give it 30 mins fires up perfect again but when all of that is going on when it won't start I smell lots of fuel and it is cranking hard sounds good but just no start ....batt is brand new coil cap wires plugs cps starter have had this issue the hole 6 years I have owned it ....thinking sbc swap

 

Check the CPS using the AC millivolts scale.