74bbroadrunner

I just put a 440 with and 833 in my 74 plymouth roadrunner and turns out I can't get a spark. I've exhausted all my skills.

I have roughly 6 volts going to the coil, no power to the distributor, I put a new resistor on the firewall(little porsolin thing), didn't make a difference. I don't know if my ECM is bad or not. When I put a test light on the prong on the firewall side of the wires goin to the distributor it sounds like the coil is ticking.

I'm getting frustrated if anyone can help that would be great thank.

6fury4

Electronic ignition is voltage sensative, try a fully charged battery. Should have close to 14 volts.

74bbroadrunner

Thanks i will give that a try. If that doesn't work how do I check if the ECM is bad or not?

rdrunner1974

You will not have vlotage at the dist. At the coil positive there should be 7-8 volts. Be certain you have the correct ballast resister. The ECU needs to be grounded at the mounting area on the firewall, if you have painted your firewall that could be the problem.
Do you have a schematic for the electronic ignition? If not go to the link to see one. http://www.mymopar.com/downloads/elecignconv.pdf
Ther is more info in the tools reference section of that site.

74bbroadrunner

I put in a new ecu car fired right up. Than it quit, I regapped the pickup coil in distributor and it ran like a champ. Than wouldn't start again, no ac voltage comin from distributor again so I am going to replace the distributor tonite and see what happens thanks for the help.