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Old 09-13-2012, 10:00 PM
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Ignition coil overheating??

Hey guys. Ive got a 1980 454 motor in a 59 chevy truck.

My problem is ive got an aftermarket HEI setup (procomp distributor with MSD blaster coil) (the square coil not the cylinder). When the motor gets hot and its hot outside the truck starts to misfire, then when its cool out it works fine. I replaced the coil once and that fixed it but now that its hot outside again its happening again.

Could this be a wiring concern or a physical outside air temperature too close to the coil causing the problem? I have a EZ wiring harness installed in the truck and no ballast resistor on the setup.

Not sure if I need to go one step farther and drill the firewall and mount the coin in the cab or if I need to be fixing wiring.

Any help is appreciated, thanks everyone
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