I'm swapping out my 305 TPI to a 350 carb crate engine, and I am looking for some information on swapping the wiring and cleaning up the engine bay from someone who has done it before. The car is an 85 IROC Z.

Is there a wiring diagram for the EMS that I should stick to?

What is required for the TPI to carb swap (specifically with the electric fuel pump) in order for it to work properly?

Any other helpful advice would be greatly appreciated.

Thank you in advance.

 

Welcome aboard thirdgen.org.

In the Carburetor forum there is a sticky in the top section called "Welcome to the Carburetor forum". In it is a link to a tech article about converting from EFI to carb.

Not sure what you mean by "EMS". "ECM", perhaps? The computer? All of that wiring is contained in a bundle that goes to the passenger fender well. You can unhook everything that it goes to, unhook it from the ECM, and pull it out in one piece. Everything you need will still be in the engine compartment coming from the other side of the firewall. Unless you have an automatic transmission, in which case the torque converter lock-up harness just left the building with the ECM harness.

Why not just put the TPI on the crate engine?

 

Yeah, I meant ECM, been a long day =P

After reading your reply I see now that it may be unfortunate that I have an automatic transmission. So that being the case, is the torque converter lock-up harness the only part of the ECM harness that I need to salvage from it?

The reason I am going with carb is because every person I talked to about my "end game" dreams for this car suggested to go with carb, along with being able to get a lot more power in the long run, they also indicated that it is a lot cheaper, which is good because I'm a student.

Thanks for the help, and the carb info.

 

so what problems would occur from pulling an ecm? i pulled mine just for a day, drove without it and everything and it was all fine. would it be that somebody swapped both the engine and transmission from my camaro?

 

For one thing, when you start with an EFI engine, the ECM powers the fuel pump. There is an oil pressure switch in parallel, but it would require oil pressure (obviously) to turn on the fuel pump.

An '82 would have a TH200C (not TH350), which uses the ECM to lock up the torque converter. Not having functioning lock-up is not as critical with a TH200C as it is with a TH700R-4.

 

okay. but everything started up and ran fine.. almost better and healthier than it did with the ecm. i know that the tranny wouldnt have been the th350, but somebody swapped the old one out for that one.

 

Okay, just clarifying. Is it a TH350, or TH350C? If it is the latter, it will have an electrical connection above the pan rail close to the shifter shaft.

 

th350