Hello! I am wanting to change out my 3.1L SD engine from a 92 firebird and put in a 350 TPI unit. If I stay with the SD set up, can I keep my existing wiring harness and just add two injector plugs?

thanks

 

Get the proper harness from a donor car. You'll need other things, anyway.

 

Well. I think that I've gotten everything that I'm supposed to get from the donor car, but it is a MAF and I'd like to go to MAP if possible.

 

Ok. if the 350 TPI uses the 730 ECM and the 3.1L uses the same 730 ECM , and the only difference is the Memcal, then why wouldn't the wiring harness hook up the same way? I don't know what the difference would be between the SD 3.1L harness and a SD 350 TPI harness. TPI uses the same type of two coil connector like the 3.1L, I think, so the only difference would be the connections? the 3.1 has these:

oil pressure
coolant temp
fan control (only 1 fan instead of 2)
iac
tps
injectors (only six instead of 8)
a/c compressor
alternator
knock sensor
egr
MAP sensor
distributor
incoming air temp sensor
brake
tranny connector

wouldn't all of these be the same on the 350 tpi system?

 

Those details would be better addressed on the TPI forum.

 

I'm trying there too. and a couple of other web sites with no luck yet.