So no6 cyl has developed a misfire. Seems worst at idle and comes good at higher loads. Follow my tests and see if you can find an error my logic.
I swapped coil packs and sparkplugs on 5 and 6. Prob stayed in 6. So ruled out spark plug and coil pack as cause.
No6's injector plug has fallen apart. So I smashed all the plastic off and heat shrunk each contact and pushed them back on the injector individually. (well my coil plugs have been going strong like that for years).
Still fucked, so I am still thinking a high resistance join in the injector plug still. So I swapped over no5 and no6 injector plugs. Now the 2JZ is sequential injected, but even so the misfire followed the dodgy no6 injector plug no no5 cyl. Removal of the no6 injector plug from no5 injector caused no difference to the running of the engine. Removal of no5 plug from no6 cyl did cause an even rougher idle. So ruled out injectors and ignitor and cyl itself as cause becuase the fault followed the injector plug (update I even swapped the injector over and it isn't the injector)
Still looking like its the dodgy injector plug. I squashed down the 2 heat shrunk terminals from inside the original plastic plug like I done with all the coil pack plugs with success, and they fit on the injector pins very tightly. So I doubt it is that. But to be sure I stripped back some insulation from the wires of the injector terminals and tested from the stripped section of the wire to the actual terminals and it was continuous. To be even more sure I connected a wire with alligator clip to each stripped section and clipped them to the injector pins. And its still fucked! That ruled out the injector plug.
I unscrewed the large plug from the ECU and sprayed it and its still fucked.
What the hell is left? Its not the injector plug, spark plug, ignitor or the injector. Is it the ECU itself? Dodgy injector driver? FUCK FUCK POS CUNT. Imagine if it was no 4 plug or something? I would have has to remove the plenum for all these tests. I'm glad its not the injector as I would probably need to buy a whole new set.
Who has an Aristo or Supra ECU I can borrow?