1995 Toyota Camry 2.2 long story and need some thoughts

Ok long long story here, but I'll cut to the chase. Car has had an intermittent crank no start for 2 years now. Been all over the world and had parts thrown at it. I won't go into everything that was changed because we all know new doesn't mean good. I get the car in and it starts and runs. A while later (cold engine) I try to start it and find spark but no injector pulse. I begin checking the basics. 5v ref. power tot he injectors, and scope the G and NE signals from the distributor to the PCM. Sine wave are good. At this point I was going to check the IGT and IGF at the igniter and the vehicle started. I should have had those leads set up, I know. So...as the car runs I keep my scope set up and all my signals look good. I shut it down and keep trying it. Finally get it to crank and not start again. My signals from the distributor are good, but no IGT or IGF. I then check spark and pulse again to be sure of what is going on. No spark and no pulse this time. So, now it gets strange. My partner stops cranking it and the IGT comes alive on the scope. As does the injectors and the ignition. KOEO it floods the hell out of the engine until he shuts the key off. I pull plugs dry cylinders out and start over again. It no longer does it. Keep in mind, at this point I checked all my grounds and power feeds at the pcm as well. Checked the harness running near the EGR as they were troublesome on these engines. After seeing a signal from the distributor to the pcm and nothing from the pcm to the igniter, I call a bad computer. The customer bought her own from some online place. 4 days later it arrives and I plug it in. Crank no start. Plug the old one in and it fires right up. I am thoroughly banging my head against the wall with this thing. What am I missing??? Anyone?

Man, this one makes my head hurt just reading about it. :silly: Can't imagine how much this has driven you crazy at this point.

How's the G and NE signals look on the scope? Good amplitude? Just wondering if signals are intermittently weak. Not sure if you've been watching them while the IGT is dead.

So, now it gets strange. My partner stops cranking it and the IGT comes alive on the scope. As does the injectors and the ignition. KOEO it floods the hell out of the engine until he shuts the key off. I pull plugs dry cylinders out and start over again. It no longer does it.

It was firing the injectors with just the key on? :blink: I don't suppose you got a look at the IGT or distributor signals while it was doing this nonsense?

I was monitoring the IGT while it was firing injectors and spark. It was a perfect 5v square wave. Same as if it was running but the signal was very fast. Like wot situation. When it does not start the NE and G signals are fine. Same pattern as when it does actually start up.

BTW the distributor signal was inactive during the firing of injectors and coil with the key on.