I bought two Tacomas, one with a damaged front end, the other a freshwater flood truck.
Used body parts from the flood truck to finish off and make one good truck. It is fully driveable.
Back to the flood truck. Simply put - I only get spark for about 3 or 4 rotations, then the spark stops even if you hold key and continue starting. I do get a couple of combustion pulses along with the spark, then nothing.
I'm using the ECM from truck 1. Already established flood ECM is innoperable. No spark no matter what happens.
Verified immoblizer system by removing transponder ring from column and hang truck 1 key in it while using flood key to start truck. Immobilizer system continued to flash. Reassembled and no immobilizer indicator.
Things that have been addressed already:
Tank drained physically and also at return line after rails. Fuel pump is working. Fresh fuel added.
Oil drained and refilled
Throttle body is opening and closing normally.
Compression 'feel' good.
Spark is present using light tester that connects between plug coil and plug, but only for a few rotations.
I don't have a scanner to read the data. Unable to verify if I'm getting crank or cam signals, though I could check resistance per manual.
Will ecm spark discontinue if it doesn't read crank or cam signals? I can pull these sensors off a third truck if necessary. Any other ideas?