CJ5 Still not running (follow up to previous msg) - JeepForum.com
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post #1 of 2 Old 04-28-2002, 06:37 PM Thread Starter
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Post CJ5 Still not running (follow up to previous msg)

A few weeks back I wrote about my '77 CJ5 that I could't get to run. I did get some responses and I've tried the things that I was capable of doing. I have a little more information now that may be important in diagnosing the problem. The main sympton is that the engine cranks but doesn't seem to fire. When I do get it to fire it kicks out alot of smoke and runs extremely rough. I've checked the timing and originally it was running at about 8 BTC which I believe is on the high end of the spec. We rotated the distributor until it idle smoothly. That put it above 12BTC. We didn't take it for a spin that night but the next day it was back to idling rough. I've already replaced the fuel filter, distributor cap, rotor, ignition coil wire, and rebuilt the carb. All of my vaccuum hoses have previously been cut and plugged. I did a quick inspection and I didn't see any obvious leaks in the plugged hoses. The spark plugs are very new, but I have concerns that I don't really know what engine I have since when I order the spark plugs from 4Wd they don't fit. I end up taking the plugs out of the engine and then trying to match at Autozone. I did write down the number off of my engine but I don't know where to go to cross reference it. The number is 103C09 if any of you have that information. I also checked the compression tonight and it came out the following: 1:110, 2:130, 3:115, 4:130, 5:107, 6:130. Not knowing exactly what engine I have other than it's a inline 6, I'm not 100% sure what psi they are suppose to be. My Manual says 150 psi, so are those reading low enough that it wouldn't run (especially cylinder 5)? I also added a few tsp of oil in each cyclinder and the reading went up sligthly in each of the cylinders. Usually 10psi or less. And I know the rings are starting to wear since I do burn some oil. I also noticed today that when I did get it running briefly that it started to backfire out of the exhaust. Does any of this information help diagnose the problem? I'm getting desperate since summer is around the corner and I can't take the jeep in since none of my vaccuum hoses are in place. Any help would be greatly appreciated.


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post #2 of 2 Old 04-29-2002, 08:36 AM
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Well, you likely have either the 258 or 232. Either one will take the same plugs, everything on either motor is the same except the stroke. Same bore, same head, etc. The 258 is a stroked 232, i.e. different crank.

Your reading for compression are typical of a slightly worn Jeep 6. <img border="0" title="" alt="[Wink]" src="wink.gif" />

Nothing out of the ordinary and it would have no effect on it's running or not. I ran a 258 for years with about ~110 on all cylinders, and 80 on number 1, then the 80 kept decreasing until it got to 0psi, then I realized the exhaust valve was totally burnt. I kept driving it for another 6 months no problem, in fact, it seemed to have almost the same power, miraculously. Then, once my performance motor was done I swapped it.

What you have sounds like a timing/ignition problem. Although your degree readings look ok, (anywhere 8 - 12 BTDC should be fine to get it to run, then fine-tune), your problem could be elsewhere.

You could have jumped a tooth in your timing chain. Very common, has happened to me when the chain wears out. If you jump a tooth, your cam is then not timed right to begin with. And simply tuning the distributor to "retime" it really doesn't retime it, it gives you a "false reading" that shows that it seems to be timed right.

If you have tried everything else, I would take off the timing cover and see what happened, I would bet you are off ad tat it jumped. Easy to tell, follow the manual, it'll show you how to check if the marks line up properly. There are 2 positions you have to check against each other, so really pay attention to the manual for the correct procedure! <img border="0" title="" alt="[Wink]" src="wink.gif" /> If that is what it is, replace the timing chain and once it is set up right, i guarantee it will fire right up!

Let me know how you make out if you take that route. Timing chain is easy to do, make it easy on yourself, unbolt the grill and radiator, then you can actually sit on a bucket right in front comfortably and work nice! Grill is very easy to remove, as long as you can get the center body mount bolt undone.
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