x69x442x

I have posted on here with no reply to my issue so I will try to give more info this time. 1991 z28 5.7 tpi 700r4.

As the title states, I cannot get power to my fp or injectors....engine turns over fine. Security light comes on then turns off. Had after market security system but I removed it which didn't help. Fuel pump runs fine if hot wired.

New cap/rotor/plug wires/coil/icm/fuel pump relay/ecm(used prom from original ecm)

Tried noid light on injectors...nothing. Cleaned every ground I could find. Maybe I am missing something...where are the main grounds for the ecm? Any insight will be greatly appreciated...I am going insane here

Tuned Performance

iTrader: (92)

Do you have spark ? have you checked for power on each injector bank or just with a noid light ?

x69x442x

I do have spark...it will run on starter fluid. I checked power on one injector and it did have 12v.

Tuned Performance

iTrader: (92)

Although the secerity light went off just to reule out that the passkey module is is sending a 30hz at 50-60% to the ecm you can check that when you cycle the key on pin f10 a blue wire on your ecm. Another thing to check is the resistance of all the injectors. if you have a injector grounding out it will shut off the injector drive. Just to verify power to the ecm you can turn your key on and jumper the aldl pin a to b if it enters field service mode with the mil blinking it has power. If the grounds behind the passenger cylinder head are good than at that point it sounds like a bad icm. Although the common side to go out is the controlling ignition coil. If the icm is not sending distributor reference pulses to the ecm the injectors will never fire. Although this does not rule out a faulty ecm but checking the voltage on the serial data line you may be able to detect a faulty ecm.

mcrandrz

Also if your oil pressure sender is bad it won't send voltage through to the pump


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