95_lq4_z28

I don't know where to put this thread because its half fuel and half wiring. I swapped in a 5.3 into a 95 z28, with a "swapped" harness from BP Automotive. Anyways the computer is telling the #3 injector to fire. First I changed some ground and power wires and got all my injectors to read 12 volts on the hot side. Then I ran a new ground from the injector #3 to the PCM, no fix. Swapped computers still no fix. The car runs, but gas gets into the oil if that injector is left plugged in. Any help or ideas would be appreciated.

oange ss

iTrader: (50)

Swap #3 injector with another, if the problem follows it's the injector

95_lq4_z28

I've tried that. It's not the injector itself.

Old Geezer

iTrader: (3)

"First I changed some ground and power wires and got all my injectors to read 12 volts on the hot side."
What wires did you change? Is this a new or a modded harness?
In what order did you change things? IE: pcm, ground wire to #3, etc.
Ohm test the inj.
Injs fresh, or have they been sitting in the new engine?

95_lq4_z28

We changed the hot wire from the injector fuses to connector that feeds the hot side. We changed the ground wire that runs from injector 3 to pcm. No idea on injectors. No way its an issue with them tho.

95_lq4_z28

Nobody has any ideas??

Old Geezer

iTrader: (3)

called BP Automotive??

95_lq4_z28

All he said is that there is nothing wrong with the engine harness he gave me. And to test signals with a noid light which didn't tell me anything.

joecar

If you swapped injector at #3 with another, and #3 still sprays continuously, then either wire harness may have a short to ground (including connectors at ends), or PCM may have internal short to ground.



You will need to test the harness for a short.

oange ss

iTrader: (50)

unplug #3 injector connector, unplug PCM connector, check continuity between injector connector ground signal terminal and circuit ground (frame, battery etc..) If you get continuity then there is a ground short in the harness. If you get an open circuit, then it's the PCM.

95_lq4_z28

We did that and there was no continuity.