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Unread 09-28-2011, 01:17 PM   #1
dino2000
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1976 CJ5 
 
Join Date: Jul 2011
Location: sacramento, ca
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Won't restart at operating temperature

1976 CJ-5, 258, single barrel carb. all smog equipment in tact and passed test with flying colors. Jeep has 101,000 miles on it and I have a fairly complete service history.

I can get in this thing in the morning and it fires right up. The choke functions perfectly. I have replaced ALL of the ignition components. The fuel pump is new. I have flushed the rad, new hoses and new thermostat. It runs down the highway and around town without issue. The problem starts when you shut it off at operating temp. It will not start back up until it has sat or "cooled off" for at least 20 minutes.

I have noticed two things that are odd when this happens. The coil and resistor are so hot that you cant even touch them and the motor won't fire on starting fluid. The coil and resistor are mounted to the side of the motor in the stock location.

I have checked the carb and it DOES flow fuel when this happens. So that leaves me to believe that this must be an ignition problem. Again, all of the ignition components are new.

Magically, after about 20-25 minutes, she starts right up and runs flawlessly. My son and I took the Jeep for it's first real trail ride / overnite camping trip a couple weeks ago and it was a serious PITA to have to wait 20 mins. every time I killed it on the trail. We live so close to so many great trails and I'm less inclined to go because I just can't nail this down.

Any help would be GREATLY appreciated. Thanks in advance, Dino

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Unread 09-28-2011, 01:31 PM   #2
Matt1981CJ7
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Have you checked the timing?

Too much initial advance will make them hard to start when hot.

With the coil and resistor mounted next to the engine, I think it's rather normal for them to be hot after running the engine for a while. Or do they get hot immediately upon starting?

Matt
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Unread 09-28-2011, 01:34 PM   #3
Jeepican
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1976 CJ5 
 
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Location: White Oak, TX
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Not sure if this is the "right" answer but if you still have the stock prestolite distributer, this may be your problem. I had that same issue when i first got my 76' but its in the middle of a build so havn't been able to test since.

Best option is to yank that out and put in a HEI / DUI / or teamrush (4wd has a deal on HEI for $99)

Also when is the last time you rebuilt the carb? I ended up swapping that 1bbl carb and intake to a 2bbl intake and mc2100 ... it made a world of difference! (this can be done for under $100 with used parts)

here a couple threads on teamrush options....

http://www.jeepforum.com/forum/f8/ig...-jeeps-990988/
http://www.jeepforum.com/forum/f8/pr...76/index2.html
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Unread 09-28-2011, 01:35 PM   #4
dino2000
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thanks Matt. Will start it tonite and see how lojg it takes the coil to get boilin'.

I don't have a timing lite, but will get it checked. Wouldn't that show in the way it runs normally? It did diesel a little when i shut it off once, but it only happened that one time. Thanks for thr help. Things' got me BAFFELED!
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Unread 09-28-2011, 01:54 PM   #5
Matt1981CJ7
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dino,

No worries. I hope it's something simple like timing.

Pinging under load, like marbles in a can, is usually a sign of too much advance. It can be difficult to hear, however, if the detonation isn't too bad.

Does the starter struggle to turn it over when hot? Or does it turn over normally without firing?

Matt
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Unread 09-28-2011, 10:29 PM   #6
dino2000
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Location: sacramento, ca
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Quote:
Originally Posted by Matt1881CJ7 View Post
dino,

No worries. I hope it's something simple like timing.

Pinging under load, like marbles in a can, is usually a sign of too much advance. It can be difficult to hear, however, if the detonation isn't too bad.

Does the starter struggle to turn it over when hot? Or does it turn over normally without firing?

Matt
turns over normally. will check out the distributor option.
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