Ugh! I’m out of ideas and out of energy for the day. I’ve tested everything I can think of.
I’ve tested literally every fuse in the car and swapped almost every relay with known good ones a few at a time including, but not limited to, both fuel pump relays, the starter relay, and the ECM controlled relay. I have also tested the relays individually with test lights and a 12v source on the bench and all functioning properly. I have pulled all six coils and they look pristine. I have pulled all six plugs and they look fine. I tested one by taking it out and grounding to the block while cranking, but didn’t check the rest. I pressed the reset on the inertia switch, but it didn’t feel like it had been tripped.
I have fuel at the rail. I don’t have a proper fuel pressure gauge, but when I jump the pump #1 and then the pump #2 relays, I get a fairly strong, steady stream at the rail from each. I don’t see any water or contaminants in the gas pulled from the rail. I swapped the fuel pressure regulator with a known good one. The old one had fuel at the top end, but was dry at the bottom end, so it looks like it was holding pressure. No fuel at the vacuum inlet.
I am reluctant to use starting fluid on a super charged car (primarily because the can says "Do NOT use on super charged cars). Nonetheless, I did shoot a few short bursts into the breather line after the MAF sensor. (Pulled it off, shot in a few bursts, put it back on, then tried to start.) It tried to start and ran weakly for few seconds with starting fluid, so… whatever that means. But I think it at least means that I’m getting spark. (That’s why I didn’t bother with checking the rest for spark, plus, it started perfectly and ran smoothly to the end of the driveway right before it died last week.)
I checked every ground in the car that I could find. I pulled the ECM and looked it over. It looked brand new, no corrosion of any kind, no bent or damaged pins. Ground at the ECM was good.
It may be worth noting that the ECM had a sticker on it that said manufactured in May of 1996. But, it also had a sticker that said “R493 LNA 1410SF Date 5/12/02 SAGEM PROM Ref 9359.” The date was written in by hand. I assume that was related to reflashing the EPROM or something as part of some factory mandate???
I also put maybe 5-10 ml of fresh engine oil into each cylinder through the plug hole. Made absolutely no difference.
And I’m still not smelling any fuel at the exhaust even after extensive cranking.
Based on all of this, I feel like I’m not getting fuel, but it’s available at the rails. I can’t imagine that all 6 injectors would go out at one time. But what would keep the car from telling the injectors to fire?
My X300 diagnostics are rusty, (so PLEASE CORRECT ME IF I’M WRONG ABOUT ANY OF THIS) but I don’t think it’s the CAM position sensor (CPS) because even when I crank for a long time, it still doesn’t start. I don’t think it’s the CRANK position sensor (CkPS) because I’m seeing 200 rpm on the tach when cranking.
I don’t have a noid light, and as I recall I can’t check to see if injectors are firing with a test light. The pulse is just way too short. Could it be a throttle position sensor? I’ve never cleaned the throttle body on this beast because I can’t figure out how to remove it with the super charger.
WHAT AM I MISSING?!?!?!