driving???
Was doing some logging for initial tuning on the 05 Hummer engine in my 55 Chevy.[Stock PCM]
Got the cold start done, NP.
Started the drive logging. Went WOT for a short distance, [<mi]. Got a very loud backfire and engine quit. I saved the log.
Was fun while it lasted!!
Will not restart, nor turn over w/ the starter. No FP prime, no ALDL connection. [Reports no vehicle found] $0280?? Tried the bench harness>> Got the same code.
Checked all fuses. OK
Checked for 12v to pins 20 and 57 on blu connector/good. Power is OK to the ALDL.
I thot maybe the engine scrammed.. Appears to be OK. Plugs good, turns w/ wrench on balancer bolt, no H2O in the oil pan, etc.
Is it usual that the PCM would just die like that?? [Only has 15K on it]
Found some posts by TAQ back in 07.. Read and failed to "comprehend" them.
Did a "jump" on the neutral start and FP relays. Those systems are working.
Update:
DFE1 and I tested the pcm w/ his bench harness. Worked fine. Found my harness was missing a ground wire connection. Corrected that. PCM worked fine.
Tested all 12v wires to the blu connector, from Howell fuse panel. OK.
Tested the plug in the start/run power feed. OK [Could have been flaky??] Don't know.
Reinstalled the pcm. Previously failed systems, [neutral start & fuel pump] work.
I have yet to start it. Am going over ALL the elec connections in the entire car....
Thanks for listening.....