cranks but wont start. - JeepForum.com

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post #1 of 19 Old 06-29-2013, 07:36 PM Thread Starter
lance89xj
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cranks but wont start.

I have an 89 Cherokee 4.0l that cranks but wont start. I have replaced everything that makes spark and fuel. please someone help me out. thank you

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post #2 of 19 Old 06-29-2013, 09:17 PM
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Did you check your distributor? Are the spark plugs wires in the correct order?

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post #3 of 19 Old 06-29-2013, 11:29 PM Thread Starter
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yes its a brand new dissy, roter, cap, plugs, wires, ICM, and coil. Also replaced the CPS. and yes the fireing order is right. I set it at TDC then stabbed the dissy, roter set facing #1.
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post #4 of 19 Old 07-01-2013, 05:54 AM Thread Starter
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Quote:
Originally Posted by Muddy97Cherokee View Post
Did you check your distributor? Are the spark plugs wires in the correct order?
yes and still nothing
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post #5 of 19 Old 07-01-2013, 11:47 AM
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Thread moved to tech section and bumped!

***Chris***

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But I still wouldn't trade it for a Coupe DeVille."


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post #6 of 19 Old 07-01-2013, 07:16 PM
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Have you tested your 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

If you own a Renix Jeep, you'll want to check this out.

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post #7 of 19 Old 07-01-2013, 07:44 PM Thread Starter
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Okay so my spark is good and my fuel is good. Now I did a compression test and it ranges from 80-95. so since I have done everything to the moter I can besides the piston rings, that's next. there not sealing causing a no-start. thanks for everyones help
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post #8 of 19 Old 07-01-2013, 08:07 PM
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I would not rule out that the timing chain could be installed wrong, causing low compression. So many things were done, one right after another, you could have caused yourself an issue and not known it.

If you own a Renix Jeep, you'll want to check this out.

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post #9 of 19 Old 07-03-2013, 05:12 PM Thread Starter
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So due to the low compression im going to replace the piston rings now. ill keep everyone updated
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post #10 of 19 Old 07-03-2013, 05:13 PM
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Quote:
Originally Posted by lance89xj View Post
So due to the low compression im going to replace the piston rings now. ill keep everyone updated
You're a glutton for punishment.

If you own a Renix Jeep, you'll want to check this out.

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post #11 of 19 Old 07-04-2013, 05:17 PM Thread Starter
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You're a glutton for punishment.
why u say that?
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post #12 of 19 Old 07-04-2013, 05:21 PM
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Quote:
Originally Posted by lance89xj View Post
why u say that?
See post #8 for starters. A simple compression test, dry then wet, would VERIFY if it is rings or not.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below


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post #13 of 19 Old 07-05-2013, 03:11 AM Thread Starter
lance89xj
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Quote:
Originally Posted by cruiser54 View Post
See post #8 for starters. A simple compression test, dry then wet, would VERIFY if it is rings or not.
I did do a wet test and the compression was the same meaning the rings are bad right??? and I cheeked the timeing chain again after I did the compression test and its still set right like I put it. 15 pins inbetween each dot on the gears just like the book says. idk what else I could possibly do to get this damn thing going again.
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post #14 of 19 Old 07-05-2013, 07:32 AM
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Quote:
Originally Posted by lance89xj View Post
I did do a wet test and the compression was the same meaning the rings are bad right??? and I cheeked the timeing chain again after I did the compression test and its still set right like I put it. 15 pins inbetween each dot on the gears just like the book says. idk what else I could possibly do to get this damn thing going again.
If the compression numbers were the same, the rings are GOOD.

I think the cam timing is off.

You threw parts at it without any diagnostics and very possibly messed up something along the way. Compression being low could very well be caused by improper cam timing.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below


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post #15 of 19 Old 07-24-2013, 07:32 PM Thread Starter
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so I pulled my pistons out and my rings were all corroaded up and stuck. I cleaned the ring groves and the pistons themselves. I desided to pull the camshaft out and found out all the lobes were vary worn down and the lifters were vary worn as well. I bought a new camshaft, lifters, push rods and rocker arms. all new gaskets. now im putting it all back together I bought main bearing set and connecting bearings as well. now I gotta put it all back together I hope this works out
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