1954 pickup with Chevy HEI, no Spark - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-03-2010, 10:26 AM
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1954 pickup with Chevy HEI, no Spark

I have a 1954 Chevrolet pickup. It has a small block 350 with the newer HEI coil inside the distributor. The truck was running fine, but then after a bad rainstorm just quit working. Looks like water went down the hood onto the distributor.
I took the cap off and the coil was melted. Replaced the coil, cap, rotor, ECM module, and capacitor, and still no spark. I am getting a good solid 12v to the dist, even when cracking. Anyone have any ideas?? I have replaced about everything on the dist I can and still not a whimper of spark.

Any help is greatly appreciated.


Thanks,

Ty

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Old 06-03-2010, 04:14 PM
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The mag pickup could be bad, there are several threads on here on how to test it. Also with the cap off you may want to look to make sure the rotor is turning.
Another common mistake is to forget the center post in the cap with the spring.
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Old 06-04-2010, 10:11 AM
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I've searched without much luck as to how to test, but I can confirm that the rotor is turning and the spring is in the center of the cap. I'll keep looking for how to test the magnetic pickup coil. From what I am reading sounds like I need to test the new ignition coil I bought too.

Thanks,

Ty
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Old 06-11-2010, 12:13 AM
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is the ground strap for one of the four coil screws intact still and grounded good?

this has to be there and good ground or coil will burn up in operation sooner than later if not immediately

it is a steel stamepd piece of tin that runs under one of the screws and extends to the middle of the cap wiring plug spades thing where BATT and TACH terminals are

mke sure good ground with test light and a hot source

if nothing still then try another ignition module and pickup coil or another dsitributor
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Old 06-11-2010, 08:59 AM
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I picked up a new ground strap because the other was coroded. I am leaning that it is the magnetic pickup coil in the dist. Going to pickup one hear shortly.

Thanks for the help though!!
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Old 06-11-2010, 09:48 AM
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Quote:
Originally Posted by Truckingrodder
the spring is in the center of the cap. I'll keep looking for how to test the magnetic pickup coil.
Just to be clear on this- the spring end of the carbon brush goes against the underside of the coil, the carbon button goes against the rotor. Use dielectric grease on the rubber gasket.



To test the pickup coil, unhook the two terminals carefully, test each one to see that they're not grounded by hooking one tester lead to the wire, the other to ground. There should be infinite resistance.

Now check between both wires. There should be somewhere between .687 - .990 ohm resistance. The p/n for a "generic" p-u coil (from a '77 Camaro w/350) is DR106- that's what the value shown above is for. If it's another p/n, look it up then find the values for it HERE.

To test the coil, refer to COIL TEST , the primary and secondary resistance (same generic '77 Camaro w/350) is HERE.
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