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Unread 05-14-2013, 04:23 PM   #1
Mudboi222
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1989 XJ Cherokee 
 
Join Date: Apr 2013
Location: Ringgold, GA
Posts: 13
89 Jeep Cherokee Starting Probs

Hey guys me and my dad just finished putting in a new transmission for my 89 Jeep Cherokee Laredo. Everything went pretty well with the install untill we went to go start it up. It took me about a month to come up with the money to get a new transmission. Well while waiting for the transmission i would go out and put my battery in and listen to music and clean the inside. Well 2 days ago before we put the transmission in i was jacking up the jeep and didnt think anything of it but my battery was still in and we never did take my starter completly off and as i was jacking it i see smoke coming from the top of my hood. Im guessing the starter wire touched the frame or something and it caused my ground wire from the firewall to the back of my motor to melt in half. Well i got a new ground wire and put it in and checked around to make sure no other wires looked melted or burnt. Looked fine from what i could tell. Well 2 days pass we get the transmission in and now i try to start it and it just sits there and turns over and turns over. We checked to see if i was getting spark and im getting no spark at all. We did some test light checking and it led us to think it was the coil. Well i had a spare coil so i put it in. Still no luck. We can not figure out whats going on. Could it possibly be a relay or a fuse? If so where would it be? Could i test it? Could someone please help me out. Im still in highschool and have been waiting 2 months almost to get this thing back on the road. I would love to be able to drive to school the last few weeks that we have.

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Unread 05-14-2013, 06:35 PM   #2
79chiefs
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1988 XJ Cherokee 
 
Join Date: Dec 2012
Location: Lillington, NC
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CPS replace it, search how to test it to make sure.
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79FSJ Cherokee Chief 350SBC_2x88 XJ Laredo I6-A 4wd_92XJ Laredo I6-A 4wd-SOLD
99WJ Laredo I6-A 2wd
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Unread 05-14-2013, 08:11 PM   #3
Mudboi222
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1989 XJ Cherokee 
 
Join Date: Apr 2013
Location: Ringgold, GA
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Im having a strong feeling that its the CPS like you were saying. Your about the 5th person that has told me that and i bought the jeep from my uncle and he said about every month it wouldnt start and he would have to get down there and pull on the wires and move them around on the CPS till it started. I also went out there and unclipped the CPS by the firewall and tested one side of the clip and it has power going to it.
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Unread 05-14-2013, 08:16 PM   #4
79chiefs
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By what you have said, i would say like the other people change it.
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79FSJ Cherokee Chief 350SBC_2x88 XJ Laredo I6-A 4wd_92XJ Laredo I6-A 4wd-SOLD
99WJ Laredo I6-A 2wd
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Unread 05-15-2013, 06:01 AM   #5
cruiser54
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
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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
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
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Unread 05-15-2013, 09:38 PM   #6
Mudboi222
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1989 XJ Cherokee 
 
Join Date: Apr 2013
Location: Ringgold, GA
Posts: 13
My dad went outside after work turned it over with the meter in the CPS plug. Got no volts at all. Pulled it out and it was completly thrashed...went and picked up a new one for $35, put it in and she started on the first try. Thanks for the help guys!
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