What would cause the EI box to get so hot that it melts the insulating gel inside the back of the box where it mounts to the firewall? I have 6.75 volts at the + end of the coil, ballast resister is good. Truck runs, but this is the second module that has had this problem. The first was the original.
Mike

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Good gun control is hitting your target repeatedly

Four-pin module or five-pin module? What brand of module are you using?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I know this happened to my Duster before I bought the car. It was pretty apparent by the mess on the inner fender. I never had any problem with that myself, but I did buy the car in Florida, could have just been the heat down there. I lived there for a year and never had the problem while I owned it, and have never had the problem in the 9 years I had the car here in Chicago.

Could have been the outside temps, could be an internal problem. If the truck is running fine and voltage doesn't seem out of line, I'm not sure what you could do.

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There are 3 things that will live forever, cockroaches, Keith Richards, and Slant Six Dusters !!!

http://s4.photobucket.com/albums/y128/slantasaurus/

take a look around

I have an NOS Mopar unit on the shelf that has never been installed and it is melting! May just be a bad batch of goo?

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. . . there was good sport at his making.

Box overheating and melting is a symptom of a coil going bad.

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Official Cookie and Mater Tormentor.

It seems to run ok with this unit (NAPA)as it did with the original unit that I took out about a year ago. I may try replacing the coil as a precaution as I know that the coil has never been replaced in the 29 yrs I've owned it. Thanks for the help. Mike

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Good gun control is hitting your target repeatedly

Mine melted while being in storageon a shelf - some degreaser was spilled on it and afterwards it went bad

Back when these first came out ( I was working at a dealership ) we got service bulletins about giving airspace behind the unit. we just put in longer screws and a few 1/4 ' flat washers to help cool the things.Also sand off some paint for a good ground. Some run forever, some don't. just a thought.....

I know this is a very old topic, but any updates on this? I just removed one doing this and dont want to ruin a new one. I might try some washers since this is mounted in a 51 plymouth on the fire wall. Coil is new!

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51 Plymouth Cambridge with / 6

Generally-available modules are virtually all Chinese garbage these days, including the Mopar units. Get a NOS american-made module from Old Car Parts Northwest or, better, do the HEI upgrade.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yea I agree, my wheel cylinders were stamped made in China. See how this lifetime guarantee one from autozone works.

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51 Plymouth Cambridge with / 6

Lifetime warranties are a sales gimmick. In practical terms they mean you spend your lifetime returning defective parts again and again and again (until you lose the sales slip). It is worth the extra hassle and price to buy good-quality parts the first time. They generally do not come from the likes of AutoZone.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yea well, just bought it as a spare. Same with ballast.

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51 Plymouth Cambridge with / 6

Update, replacement not melting. Original looked like the original 1980 dodge one, even had mopar stamp on it.

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51 Plymouth Cambridge with / 6

I have a couple of old ECMs around. In both cases, I have noticed that the epoxy sealant has deteriorated and has begun to slowly ooze out, forming a puddle of sticky, nasty goo. I suspect that age and heat are the culprits. MoPar probably never knew that the sealant would break down over the course of 30 or 40 years.

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1961, 1962, 1963 and 1965 Valiant 200. The `65 is a `vert.