HEI Help

[bigbadchev84]

Ok here goes, A couple years ago I replaced the points dizzy in my bosses 72. He has a 327 in it and we installed an HEI we bought from the local parts house. I ran a new power 10ga power wire from the fusebox (key on) to the HEI.

Well a couple months later I remember him calling me to help him at a friends house, he was visiting and went to leave-no start. It ended up being a bad module.

He came up to me yesterday and asked me to look at it again, The truck sits all year until hunting season comes around. He was trying to start it and it just cranked, He pulled the cap off and inspected it and saw nothing wrong. He re-installed it and it fired right up.

Then he moved it into the shop to get it cleaned out. When he went to start it no fire again, it just cranked. Said he checked all connections and still nothing.

I am suppossed to go over there sunday to check it out. BAd module again? something else to look for?

 

[dremu]

As with anything electronic, heat is bad for the module. Be sure that it's not just bolted to the dizzy base, but also gooped down with the paste. Just like the heatsink on computer, the silicone paste helps transfer heat from the module to the body, which acts as a heatsink.

I'd imagine that the connections to the module should be clean, since it's new, but you could check that they're not corroded or loose.

And failing that, I carry a spare module since they do seem to go out at the most inconvenient time.

-- A

 

[K85 Octane]

I'd start with all the connections and make sure there is a constant 12v+ keyed on during cranking. Not much to an HEI, you might be in for a new module but before buying one I'd look into some alternative setups.

 

[496truck]

I've seen where condensation in the cap will cause stuff like this. Especially in vehicles that sit for a while. There should be a vent hole in the bottom of the dist or some have them in the cap.

Imagine the vehicle has sat, everything under hood is cold. Maybe some moisture in the air. Start it up, run a little bit, shut it off. Now everything under hood is warm except the air inside the dist cap. That's when the condensation forms.

Not sure this is your problem, just one more thing to look for.