Oh I see, that may be why you are not getting power to the PCM. Check out the diagram in his post. I don't see a power feed from PCM fuse to pcm...I think shbox would have to shed some light on this.

http://shbox.com/1/harness_connector_faces.htm

 

I think he means on the 95 Body harness..the wires are in different spots on the connectors.. and they just dont meet up with the 97 engine harness. I just dont know which wires to switch or how to switch them..Like the connectors will connect but the wires dont go to the same wires to make it flow..

 

Yeah, I edited my post.

 

lol @ obdI badoy harness with obdII engine/harness/pcm... been there done that. some things are just not possible. maybe it's doable, but the trouble and work you went through to make it happen wont be worth it. just do as i mentioned earlier

 

The actual fix itself it probably very very easy...just knowing exactly how to do it is what is probably difficult.

 

But dude.. why is Shbox saying not to go back to the 93 harness and pcm.. there must be faults there also. this car is ether one or the other.. why cant it just plug N play damnit! first time a Pontiac has pissed me off..

 

lol everyone rags on the 93's. it's funny how people who ctually own them are very happy with them. I've never had any problems. After my heads/cam swap - car fired right up on the first revolution of the starter. other cars of my friends that include 94-97 lt1s, after they do major upgrades like that, car will not hold idle until it is somewhat tuned

 

yeah but im just looking to get my car started, no mods no nothing.. all stock. just a car to fix and sell. maybe i will end up getting a 93 harness.. but i want shbox chime in on this once more.. cause i dont know what to do

 

Why are we talking about a '93 now? I thought the car was a '95.

 

If you're going to get another harness/pcm get a 95 to match the body harness. But if you don't find one get what you can as long as it's OBDI

 

Yeah, that's why I was like '93???

But you should be able to get your current set up to work if you study the wiring and route some wires differently. If you are not up to that, than a 95 harness should be fine, you shouldn't need a new PCM as far as I know, but I could be wrong.

 

IDK, all the **** im saying isnt me talking out of my *** - its from trial and error. me and my friends have tried different setups on different year cars and came to the conclusion that OBDII engine harness and PCM will not work with an OBDI body harness (because in an OBDII car (body harness), the second plug on the passenger side fender actually controls fuel pump and a fw other things while in an OBDI body harness (what the OP has), it only controls traction control... do you guys see my point?

I call it now - if he gets an OBDI engine harness/pcm he will not have these issues (yes even if it's a 93 because that too is OBDI).

 

Agreed. If you sell your harness/PCM and buy a new '95 harness/PCM, you should break even. But it will take time, and I would just get frustrated and rewire everything, but that's me.

 

The wiring wouldn't be worth it - you would have to re-wire the entire body harness. Anyways, OP, get an OBDI harness/pcm. Prefferably a 95 just for a match sake - but any OBDI setup will work. Good luck.

 

93 has a completely different computer and the harness plugs to it are not the same as 94-97s. That's why. Plus, it is speed density only and does not use a MAF (which is perfectly fine, but just more stuff you would have to consider if swapping). [I am not ragging on anyone with a 1993 ]

Look, there are people [95-97 types] that keep the same engine harness in their car and change their computer back and forth from OBD-I to II (slight programming issues need to be addressed). It will physically work. Nothing needs to be done to any of the other harnesses in the car. This thread has so many pages, now, I can't keep up with where we are, LOL. Maybe a summation as to what is now happening is in order.

 

I am not ragging on anyone.. putting anyone down.. i just need the best solution to my problem.. im just a little tense and this isnt going my way.. i dont mean to put anyone else down. im just frustrated.. and it seems like i just need a 95 harness..and possibly a pcm?

 

Summary (as far as I understand it):
He has a '95 car/body harness
Swapped in a '97 engine, engine wire harness, & PCM

He can turn the motor over, but has no power to the fuel pump and no spark.
Fuel pump turns on when he jumps it at the hot wire.
He can't read his PCM with a scanner.

 

correct

 

Fuel pump doesn't turn on because of the reason I posted lol

 

He would have a big problem with either 93 or 94 engine harness, since neither one of them even has a C105. There would be much rewiring to do.

Obviously a 95 harness matching his 95 car would be the best solution.

There is fuel injector power going through C100 and C105, but nothing to do with powering or running the fuel pump. Fuel pump relay control goes from the PCM to C220, cavity J on all 93-97s.

No spark was also mentioned. Remember that the opti must provide a signal to the PCM before it will allow fuel delivery as well as spark. Does the pump even prime when you turn the key to ON?