long bed john Posted March 5 Share Posted March 5 1898 jeep 6 cy no start cranks but no spark. replaced fuel tran, fuel pump, coil, ing modular plug wires distilled cap and rotor new injectors, plenty of fuel, but not spark Link to comment Share on other sites More sharing options...
Gojira94 Posted March 5 Share Posted March 5 Typo there in your year - 1988? Here's the Electrical manual, that'll be of endless assistance to you. 20473025_1988MJElectricalManual.pdf Link to comment Share on other sites More sharing options...
long bed john Posted March 5 Author Share Posted March 5 21 minutes ago, long bed john said: sorry its a 1989 Link to comment Share on other sites More sharing options...
Gojira94 Posted March 5 Share Posted March 5 I haven't seen an equivalent electrical manual for 89-90 yet, but the 88 manual is virtually the same. The big 2 plug connector on the cowl above the brake booster was done away with in 89, so you're fortunate in that regard. Mine's an 87 but it had an 89-90 harness in it. The 88 manual will pretty much cover everything you're trying to do, just ignore any instance of "C101" you see. And... welcome to the forum. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 6 Share Posted March 6 Test your CPS. CRUISER'S MOSTLY RENIX TIPS RENIX CPS TESTING AND ADJUSTING OCTOBER 30, 2015 SALAD 132 COMMENTS EDIT 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 itself as shown in Figure 2 as Connector A, 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. Another little tip to save tons of aggravation is to stick a bit of electrical tape to your 11mm socket and then shove the bolt in after it. This reduces the chances of dropping that special bolt into the bell housing. Link to comment Share on other sites More sharing options...
long bed john Posted March 7 Author Share Posted March 7 changed the cps jeep fired right up this the third cup that I have had replaced Link to comment Share on other sites More sharing options...
pizzaman09 Posted March 9 Share Posted March 9 Glad to hear you figured it out. I've heard the output of some new CPS is not good with the OEM or original ones being the best. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 10 Share Posted March 10 I would be testing the output of the cPS. Link to comment Share on other sites More sharing options...
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