Well after a few months and more than a few hundred dollars later it now goes! (well sort of)
thanks rx-7 chris for your help, still don't really know what the issue is after changing the tps, water temp, earth, afm, injector plugs and countless settings,
i'm still not happy with it, it idle's to high and everyday i start it i get a different result, from running perfect to a pile of shit and everything in between.
I LOVE your attention to detail. Interestingly enough, before even seeing this thread I had planned on an identical color scheme for my engine build! Brilliant minds, eh?
1) have you replaced the O2 sensor?
2) Do you have a wideband O2 sensor - if so, hows it look? Running too rich all the time, or sporradic?
3) Have you cleaned the gas tank?
That it runs sometimes and not others may definitely seem like a ground. I also think it could be the injectors may not be firing correctly - again could be an intermittent ground issue. Did you replace the harness during the build or use the factory? Even if it was running before, a 30 year old wire could be brittle, and the sheath may look OK but the wire itself broken enough to sometimes lose connection.
Perhaps run a new ground wire to all of the injectors? I'm looking at the wiring diagram for the GSL-SE now, and trying to determine if they are ground actuated injectors, meaning the ECU closes the ground loop to fire the injector. I'm not sure. Will keep looking. But basically i think you'd have to run a new ground from each injector back to the ecu harness plug.
Here's what I'm looking at:http://foxed.ca/index.php?page=rx7manual#firstgen
page 30 in the right-middle, B-30 and B-31
Let me see if i can dig up the method for testing if the injectors are firing...
Here we go: page 58 of section 4B of 1985 FSM. Granted this is GSL-SE 13b US spec, but the methods should be the same:https://docs.google.com/file/d/0B4M7Prx ... 3soK&hl=en
- or from the menu here - http://foxed.ca/rx7manual/85_manual_google.html