[V8] GM Ignition Module Substitution

[Greatdivide1]

Hey all its been awhile since i wrote up anything. So i figured i would write up my lastest endevor.          Well i have been reading about the hei swap for awhile now and figured why not lol... Man all i can say was i wassnt reading the right info lol.Its kind of a all or nothing swap.
 
1. You need a hei ignition amp from a 83 chevy truck with a 350
2. Next you need to remove the dist or if your like me to lazy and not wanting to retime the engine you can get it off with a 5.5mm wrench. It takes a little while but it can be done.
3. Take off the cap,and the flash sheild underneith.
4. You will see the pickup with two wires coming out. Cut those wires at the edge of the dist where they got tothe factory module.
5. Remove the blue rubber/plastic peice and drill a hole to feed the wire threw.
6. You need to connect the two wires on the pickup to a length of wire. Make it long enough  to run to where ever you want to mount the module. Then reassembly the dist.
7. Next is the connections. The new module is marked with four letters. W,G,B,C. W and G go to the two wires from the pick up. B goes to the white wire witch is the the positive side of the coil. C goes to the white with black strip witch is the negative side of the coil.
 
 http://www.solihullsociety.org/archives/107
 
That link was very helpfull to me
 
:thumbsup:Ok now heres where it took a lot of looking and reading and search to figure this out. If your coil has less the 3.0 ohms of resistance you WILL get a dead stumble like a missfire. It actually issnt a missfire. What is happening is the coil has too low a resistance to fire the ecm. The new module needs a higher resistance to be able to feed the coil and the ecm.This is how i coccected the issue. I went to radio shack and got a 1ohm resistor and wired it in to the coil. The way i wired it was i joined the white wire from the module to the ecm feed wire then to the resistor thats connects to the the coil. This worked great but when at idle there wassnt enough voltage to go threw the resistor. So now im going to get another resistor probally a .8 ohm or .5 ohm and try them.
 
Ill update as soon as i get the right ohm resistor.

[the colonel]

Upgrade with photos too!  sounds interesting and photos will help dummies like me follow along!

[Daniel]

Definitely add some photos; this sounds like it was a fun diagnosis session for you, Don. Great to see you working on the ole' girl again.