[blownalkybbc]

changed a motor in an 84 chevy c-20 for a friend from a 305 to a 350 reusing the HEI distbutor, we took off all the emissions stuff as it's not required where he lives and all the computer stuff since it was basically nothing but a pain in the butt and didn't amount to anything but controling couple of thermal controls, now the problem he is having is he has had 2 hei modules die on him in 6 months, reconnected hei to the same wiring the engine runs perfect until the module dies with no warning, anyone got any ideas to help me out, thanks

[S10Fan]

It could be due to a bad batch of modules from the manufacturer. Is he buying the cheap ones? Are you guys using the grease that goes under the module?

[blownalkybbc]

using the delco modules and i sent him the first one and i live in va. and he bought the second delco in tampa fla., thanks

[blownalkybbc]

sorry bout that, not sure about the grease under the module, i'll have to check,

[S10Fan]

Sounds like module quality isn't a problem. Other than the grease I don't have any further info. Hopefully docvette will reply.

Flat tires are a lot easier to fix. LOL.

[kain13]

make sure you have good grounds bad grounds will fry a module quick

[blownalkybbc]

ok thanks i'll double check both grounds in the cap and the engine ground

[docvette]

Doc here,

Be sure it has plenty of heat sink grease..without it or not enough will fry a module quickly, they are very heat sensitive..don't get sloppy with it but generous..

Pull and invert the cap, look for carbon trails, from the towers down to the base of the cap..If you find ANY GET A NEW CAP.

Same applies for the rotor..

Be sure the plug wires are proper for an HEI AND all are good..as well as proper gap and condition of the plugs..open wires , shouted plugs and every time that cylinder fires, you have 40 kv all dressed up and nowhere to go..it will find comfort in the module ground.."PoP"...

Lastly get a diode check on the alternator, If one or more are bad, the alternator will pass AC (raw alternator power) back into the system and fry a module (as well as any other linear op amp or HMOS / CMOS electronics)..

Check also the tach and tach wire for intermittent shorting..

Doc

[blownalkybbc]

thanks, that gives me a few things to look at