Aright so ej swap has been on the road for 25k miles, then it starts normal one morning, shut it off for a few hours, go to take off again and it just cranks and trys to start soo bad, it sounded like a low idle while cranking, but nothing. It has spark and fuel too, the spark looks bright yellow? I got towed around the block with it in gear, it did nothing but spudder here and there. I replaced the cam/crank sensors, the ignitor, coil, and plugs and nothing. I jumped the main relay and also squeezed the fuel return to build higher fuel pressure incase the regulator crapped out.
I also got another harness and ecu, tryed the ecu first, same result. Now I just got done spending like 12hours on the new harness, and put it in the car and the SAME crap. The main ground for the ecu is good and snug. I pulled the side timing cover and wiggled the belt and it's tight, i couldn't possibly see it slipping.
BTW before doing all this I pulled codes and got idle switch, iac, neutral sw, and st. switch. none of these seem like they would threaten it starting at all? I also hooked the start switch up this time.
Also The only ground is through the harness and to the intake manifold, for the ecu that is, but that worked before.