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 Help lost fire, Electronic distributor
bent1
Posted: Apr 21 2012, 07:39 PM


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Group: Members
Posts: 18
Member No.: 1,393
Joined: 10-February 12



1953 CJ3B
Switched over to ED about 3 months [ 1200 ] miles back. Driving down the road today around 50 MPH and the engine dies. Coasted into a parking lot, popped the hood and no fire to the plugs. Figured the ED modlule that I have head about crapped out and had previously purchased a spare. Called the wife to bring the truck and spare module. Installed the module and nothing. Checked the fire at the coil and made sure fuel was pumping. Hot fire from coil to the distributor and plenty of fuel pumping. Nothing at the plugs. Besides the replaceable module [ which I switched out ] Where should I start ? The rotor cap does not want to come out and I don't see a part number for the ignighter. The replacement parts list consists of the module I replaced, and a new cap. Any suggestions ? Thank you


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Bent1
1953 CJ3B
St Joseph Mo
Top
Bob
Posted: Apr 23 2012, 08:14 AM


Bob


Group: Members
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you may have lost ground or power. Those modules need 12v coming to them and a ground, I think you've lost one or the other.


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Bob
1953 CJ3B
1965(?) CJ5
2004 Kubota l3400
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bent1
Posted: Apr 23 2012, 12:55 PM


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Group: Members
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Joined: 10-February 12



Thanks. I just checked. Witht he key on I have 12 v on the plus side. I ran a groound wire from the neg battery post to the minus side of the coil which runs to the negetive wire on the distributor. Still no fire from the distributor to the plugs. It was worth a shot.


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Bent1
1953 CJ3B
St Joseph Mo
Top
Bruce W
Posted: Apr 23 2012, 09:46 PM


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Posts: 189
Member No.: 100
Joined: 8-November 08



You might say that the distributor has two jobs. The first, or primary, job is as a switch that helps the coil make a spark and tells it when to make it. This consists of the points, condensor, cam and advance mechanism. In your case its the pickup coil and module. Since you have a spark from the center tower of the coil, this part is working. The second job of the distributor is just that - it distributes the spark to the spark plugs in the correct order. This part ( secondary ) consists of the coil secondary wire ( the big one from coil center tower to distributor cap center tower ), the cap and rotor, and the spark plug wires. Somewhere in the secondary circuit there is either a very high resistance that the spark can't overcome, or a path to ground. Maybe both. A high resistance in the secondary can cause the spark to find an easier path to ground, and will create a carbon path to follow. GM HEIs would shoot a hole thru the center of the rotor and ground to the shaft because of a bad spark plug wire. I'm guessing you'll find a bad cap or rotor or maybe a bad coil secondary cable. Look for what look like pencil marks or cracks inside the cap, or a burned spot on the bottom of the rotor in the center hole. Are you using solid wire core plug wires or carbon core resistance wires? BW


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Bruce Walker
Northeast Colorado
'53 CJ3B "Nellybelle", '48 CJ2A "Uncle Lyndon", '47 CJ2A "Teddy", '47 CJ2A "Rusty", '47 CJ2A "Zak", '43 GPW "Sarge", '88 XJ "Pluto"
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wnewbury
Posted: Apr 24 2012, 07:12 AM


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Joined: 29-January 12



I had big trouble with an electronic module and it was the distributor bushings. They would let the top rotating part of the distributor contact the stationary part of the module and tear it up. The big pile of carbon dust was a dead give away, after the engine stopped running.


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Is now olive drab. P. R. Calif.
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Bob
Posted: Apr 25 2012, 10:37 AM


Bob


Group: Members
Posts: 1,194
Member No.: 77
Joined: 30-October 08



yup, distributor bushings can cause real problems. I had a pertronix for a while and got rid of it when it blew a hole through the side of itself.


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Bob
1953 CJ3B
1965(?) CJ5
2004 Kubota l3400
Top
bent1
Posted: Apr 30 2012, 05:51 PM


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Group: Members
Posts: 18
Member No.: 1,393
Joined: 10-February 12



Thanks for all of the input. Got the parts in today. It was the rotor. Evidently has a dead short. Popped in the rotor first and it fired right up. Thanks again.


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Bent1
1953 CJ3B
St Joseph Mo
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