Notapilot69

Thanks Mike. Good idea seeing if its a power or ground problem. Makes sense the little ignitors are controlling the grounding with the CAS instead of controlling power to +. i tried "hot wiring" the coils off the battery and that didn't fix anything so i bet its something on the neg side. You da man! Will report back soon

Tried the replacement ECU, no luck. Put my timing light on both intake and exhaust #1 coils while revving it, both are shutting off under load. I think it's just a matter of power to the intake coil shutting off the same time as the exhaust for some reason. Is there a way I can "hot wire" the coils to test this theory?

I should specify, these parts came off basically my trucks twin. 86 720 z24i 4wd

Hello all, long time no post.. I got an ECU and a used Manifold/tbi from a guy in Reno. Going to swap the ECU in and see if there's any change. His truck wasn't running perfect before he parted it out but sounds like he was having fueling issues. I'm weary about the TBI. I wanted to grab his harness since mine has been spliced a bunch, but didn't realize the body harness and engine harness is connected without any plugs or anything. What a horrible design! I'm not tearing apart the whole interior for that.

I definitely need a parts truck. A buddy is about to provide me with a new harness and coil modules. Maybe that'll do the trick.

Looks like no switches. I'm trying to figure out what else could be cutting out the spark despite there being power to the coils. Maybe the two ignition modules? They're $50 a piece on rock auto I might bite the bullet and try them

nothin, I don't have those. Positive the TBI trucks had them?

I don't have those i guess, looked everywhere on the passenger side fender. Two blue relays but they don't have any vacuum lines running to them. The hunt for the problem continues I guess.

Sounds good Mike I'll try it.

Hello all. Finally got a "new" used dizzy installed. No change. Still falls on its face under full throttle. Only code is 21 - ignition signal. Any thoughts? I have no idea what it could be at this point.

Going to try this new dizzy and go from there. Should be here next week. Thanks fellas

Thanks charlie! I'll let you know. I appreciate y'all keeping up with this rollercoaster with me

I'm already not registering it in CA, I'm not a resident! Carb is sounding better and better but have to fix the spark issue still Loss of spark on the neg side makes sense. The module is inside the distributor and can't be replaced per the FSM. I have one coming from a friend. Fingers crossed it works!

Fixed power to the coils. Spark still cuts out under full throttle according to my timing light. Not sure how to link a video but I took one of the timing light