Looks like it goes as followed...

On the blue PCM connector-

Injector 1 = pin 36
Injector 3 = pin 3
Injector 5 = pin 76
injector 7 = pin 43

so at the injector connector for continuity test pin for the following..

Injector 1 = Black wire
Injector 3 = Pink & Black Wire
Injector 5 = Black & White Wire
Injector 7 = Red & black wire

ANDDD...

There are 2 fuses labeled INJ in the same fuse box as the starter relay and what not. They are not label which is which, but i will check both.

anyone wanna double check my pin out assumption ?

Yes.

Yank a fuse, check for power at either bank. You have a 50/50 chance here

swung home on lunch and pulled the fuses. Both good.

Are injectors key on power? So id be able to test for power at the fuse

Should be. They are ground controlled so should have power with Key on engine off.

Okie, ill check that today as well.

Nothing to helpful but just make sure you have the correct pcm pinout info for your pcm. I believe GM changed them for 99-02.

Here is current plan.

https://farm1.staticflickr.com/833/2...3ce08a8c_z.jpg

1) Make sure you have a power at each injector.
2) Check resistance across each injector (actual value is moot, just make sure their balanced)
3) Check continuity back to PCM (Personally I would snag a noid light and just see if PCM signal is getting to injector while cranking/running)
4) Swap banks of injectors and see if problem follows.
5) Cry, drive car into swamp, buy a real LT1 car
6) Success

Wait, did you verify spark and compression on the questionable side yet? Fuel, air, and spark are needed obviously so we have to see what is missing.

The pink wire is hot with "Ignition Relay Energized" so if you have power on the one bank, you should have power on the other. As said, all the grounds run back to pcm. Post pics when you find they are all fukt

Compression and spark verified.



So the PCM grounds the injector to get them to fire?

Yes

^. Most if not all FIs are ground controlled. Some just fire 4 (or 1 bank) at a time (lol 93s fbodies with bank injection).

Noid light is a great idea too makes testing easy.

Here was my findings. Im not sure if i did it right so keep with me, but this is what made sense to me.

Do not currently have a noid light.

1. After verifying the 2 injector fuses were good, i checked to make sure the fuse itself was seeing power. Indeed it is. On to the next.

Everything from here on was done with battery cut off switch off...

2. Checked continuity between PCM connector and injector plug on all 8 injectors, good to go.

3. I wasnt sure how to check for power at each injector, since i was by myself i couldnt crank and watch meter. So with the PCM plugged back in, i stuck the positive pin of the ohm meter in the pink wire terminal, and black to a ground block and it has continuity.

EDIT: If the PCM causes the injector to fire by completing the ground when it is signaled, do the injectors constantly how power while keyed on?

Cranking has nothing to do with power at injectors.

Car on, and you should have 12v at each injector pink wire.

Will check today on lunch.

So lets say i do have power at all the injectors, that combined with the other info we've already compiled would point to a failed injector driver in the pcm?

Or a unplugged PCM connector.

:bertstare:

Not sure how possibru since it bolts in doe

Are you now doubting me doubting you?

Doubtful.

I actually made sure to check they slid into each other smoothly bc you had me paranoid.

Can test injector power with just test light right? Key on with test light clipped to ground, pin pink wire should result in dat light

Correct.

Results within next 2 hours

OKAY SO.

Conundrum.

Test light i grabbed from work was 1 with 2 leads on it. Since batt is in trunk and couldnt connect, connected neg to ground stud on driver shock tower, posi connected to stud on fuse box. Battery on.

Each pink injector wire, on all 8, light the light up green. According to the instructions for the test light, a green LED means they are grounded.


da fuq

You prob nicked the harness or something

As in theres a cut or something somewhere so it’s grounding itself?