Hey guys, I'd hate to start off with a plea for help lol but I've really run into a wall on this one. I recently bought my first z, a 1990 twin turbo to be exact. It's been my dream car for years and now that I finally have one, I can't drive it because of this issue!
I have posted this same topic on NICO with no luck, so I'm expanding my horizons in hopes of getting some much needed help before taking it to the dealership for $98/hour.
I have cleaned ptu, injector, and cop connections. I have also changed out all spark plugs with ngk's (yes, the correct ones lol) and gap is adjusted properly.
I am experiencing no spark on the front driver's side cylinder. I did the power balance test to confirm this is the only dead cylinder. The coil pack harness on the dead cylinder is the only new one, put on by the owner before me (I think he knew of this problem but failed to tell me about it).
I then swapped coil packs with a known good cylinder and did the power balance test again with the same results, ruling out a bad coil pack. I also did the ohm test to double-check..it's definately ok.
I used a 9v battery to touch the injector connectors and heard the TICK, ruling out a bad injector.
I used both a test light AND multimeter to confirm that my ground wire and constant power wire to the dead cylinder coil pack are good (middle and right wire). However, the one at fault is my signal wire (left wire on cop). I believe this is true because the reading on my multimeter for signal wire was different than the other good ones, though I'm not sure if I did this correctly.
1. What do I check next?
2. What is likely the problem?
3. Is there a way to test signal wire? Can't be done with engine not running, or can it?
Thanks in advance. I hope once I get this squared away I'll be more of a help than a burden to this forum.