I have cylinders 1 7 4 6 injectors not firing the noid lite has proven this they all run on the same circuit and ground according to the manuals...3 5 2 8 are loading up with fuel....so im slowly destoying all my spark plugs...where is the ground located at and where do i check for continuity i doubt the wires are bad coming from the pcm>injector since 4 of them are working and 4 of them arent? injectors are new along with new complete ignition system including the worst part GM has ever made the OPTI any help id love to hear from you expert tonight

 

You have (2) 7.5 amp fuses in the engine compartmet fuse block that contorl each bank. Check them ( I also had a wire at that fuse back out before and the fuse tested good and never found the problem untill I removed the fuse) Then the ground comes from the PCM. they are all on thier own driver curcit. I would be taking a testlight or multi meter and see which your lacking, the hot or ground feed

 

ok i checked the fuses and both are good replaced them anyway and nothng....do you know how to check with a mulitmeter if power is even going to the fuses.......and should i check the actuall injector harness wires...ya know the little pins in side...if so how do i with a multimeter.

 

Unhook all 8 harnnes's. Take your meter on volts scale. Turn the key to the on position. Put the black lead of the meter on the battery ground termonal and probe the small contacts of the injector harness. The one that leads to the pink wire. YOu should get battery voltage on every of them. Now put your red lead on the positive battery termonal and the black lead on the non pink wire. With someone cranking the motor you should see switching from ground to no ground (it might be heard to see and this step would be better when used with a test light) see what your missing

 

ok i went out and pulled the fuse block awa from the clips and to my surprise there are only 3 wires going betweeen the 2 fuses....not a surprise that the one missing goes to the fuse controling the injectors that arent firing......the other thing is that i dont see thuis wire anywhere is should be pink right.....my only those is that it could have backed up the plastic wiring roll but where to start any suggestions...and thanks for the good advice man

 

this also is a v6 to v8 swap do i need to change this body harness too

 

There is only ONE fuse on the v6's feeding all 6 injectors. you might simply need the harness/fuse block from a V8 or tie into the harnnes and suply power by tapping into the fuse.

 

see that would make sense but everything else works......if i did sway harnesses how do i take the old one out pull off the frnt clip ....wouldnt tapping into it somehow screw up the power feed....plus the wiring diagram in the manual shows that each fuse feeds 3 injectors? i think?

 

ok the fuse idea was a dead end street....i am not getting power to the fuel injectors but i have the ground on 1 7 4 6 and more ideas bro

 

any idea's anybody.....i not getting power to the injectors on 1 7 4 6......i am get a ground on them though for some reason.....is the harness bad....pcm????????????????

 

does anybody have a pcm for sale for 95 lt1 t56

 

No no, hot and ground are TOTALY seperate. ONLY ground comes from the PCM. hot comes from the fuses.. your problem is somewhere between the fuse and the injector.

 

i have power at both fuses but not at injector 1 7 4 6 does this mean i have a bad harness

 

has anyones car ever done this...do pcm's ever go bad im not throwin dtc's and ui think i should be

 

pull your fuse block apart and trace the wire from the fuse to the injectors.

one side of that fuse is 12V switched from the large pink wire, and the fuse joins it to a smaller pink wire, which then runs to a group of 4 small pink wires that power the 4 injectors.

even if you have power at the fuse only shows your 12V switched power is there, doesn't mean there is a wire on the other blade of the fuse to give power to the injectors.

also I would run a continuity test on your wires as well. put one end of your tester on the injector plugs pink connector and then the fuse socket.