The motor starts then dies after starting for a few seconds. If I put gear shifter into neutral while it still running, then after it dies put shifter into park, then roll car forward until the automatic gearbox locks, it starts and runs fine. What sensor (or safety switch) is capable of killing engine after it has started running? that the above procedure of moving gear shifter and rolling car Fwd to lock autobox in park would have an affect on so as to temporarily stop the faulty sensor (or safety switch) killing engine? Could it be crank position sensor fault? or camshaft sensor fault? or a sensor or safety switch effected by auto shifter position? Would appreciate guidance

 

I don't know.
Could you be side-stepping a neutral safety switch?

 

cam and crank position sensors would not be in play (besides, they'd throw a code if they failed to report to the ECU). I think you are on the right rack with the PNP switch in the shifter as that does loop into the start function to keep you from engaging the starter with the car in gear. The other thing I'd look into the brake pedal position sensor as that also plays into the shifter interlock.

 

Thanks for advice. Think I've found prob and it was none of the things I thought. It appears to have been the wire to the camshaft sensor picking up interference from another wire running near it. This was confusing the ecu and making it kill the motor. When I rerouted the wire so it was kept away from the camshaft sensor wire the motor stayed running. To double check I brought the two wires together again and it killed the motor each time the wires met. I've put a section of vacuum hose over the camshaft sensor wire to better insulate it and rerouted the other wire to keep the two well apart. Hopefully this will keep it from stalling again.