So I am almost complete my V6-V8 swap, and for some that have been following my posts I have a No Fuel AND No Spark issue. Here are the details:

1995 3.4L V6 Chasis
1994 5.7L V8 Motor, PCM, and Engine Harness

Everything in the engine bay hooks up perfectly. Motor is in the car, MAS and cooling system are not installed.

Where I am lost is the difference between wires from the PCM---> Harness---> Passenger Kick Panel. (i think...)

-Is there a difference in the V6 internal (inside the cab) wiring compaired to the V8 cab wires ? (internal/cab meaning passenger side kick panel the 3 connectors by the firewall rubber stopper)

-Is there a difference between 1994 Harness and the 1995 cab wires?

Some things to consider:
-When 12v is applied to the fuel prime the unit in the tank runs.
- I've got no signal from the dark green/white while cranking
- On the ICM A and D are continious 12v while B has no voltage while cranking.
- I have two PCMs, both in good condition, when ither are installed I still don't get fuel prime or spark.
- Fuel Relay when uninstalled and 12v is applied it clicks. All 12v wires have 12v (beside the drk green/white pulse when cranking)
- NO SES light, I don't even know if the ALDL is working (1994 and 1995 C105 are different (lol i think...), but I don't know what wires i need to move and to where)


If anyone can help i would really appreciate it. I would hate to have a shop look at it (but at this rate i don't think the would get involved).

I can't wait to get it started!

 

http://www.tacreationsusa.com/3_4_3_8_v6_to_lt1.htm

 

Lol, just as you posted I was reading it.

Seems the 1995 chasis has a different dash harness then the 1994 will accept. Anyway to bypass this (rewire) or do i need to tear one out of the 1994 thats hopefully still at the scrap yard...

 

Anyone know what dash wires i need to swap over to the connectors to make this work?

 

did u program the vats system out of pcm if not theres your no spark or fuel problem as far as dash is concerned the wiring is diff as the gauge panel is different i dont know what wires are what as i did a stand alone unit and auto meter gauges go to www.lt1wiring.comand they may be able to help ya

 

i have some write ups some were ,but have to many book marks it find them lol..

 

today was raining and nasty, but my *** still went to the scrap yard. (Im ***** to the wall on getting this car started.
I went out (the junk yard) to "my" donor car to find NO HARNESS! some guy got to it before I did. I checked but there were only 2 other f bodys... a friggin 93 and 95 ffs.

I called a yard about 1hr from me she has four 1994 3.4L's. I hope one has a harness.(a guy on this forum has one too from his 1994 formula i just need him to pm me lol)

I AM THRILLED to know that once this harness gets to me (or I go get it) I can end this swap, it should be a monster when it's done.