Code 18 moment

[VirtualToaster]

Strangest thing ever happens. Sometimes my crappy motor will run "perfectly" (fuel issue, unsure of cause), other times it'll have erratic ignition (like today), or it won't have a tach signal at all. I have a breakout box and don't remember what I need to test.

All new fuel system, all new ignition system (except for distributor), new computer. Please advise on further testing.

 

[Cees Klumper]

I would suspect the wiring/grounds, and the wire shielding to the TFI module. Been battling my own Code 18 issue for over a year now.

 

[VirtualToaster]

Followed this sheet, it appears I need to ground the ignition ground wire again. Or inspect the splice, I'm not above a hack job.