PCM Protec Pro Boss EFI

Your links don't work.

I would take a look at the protec/tbi wiring diagram in the reference section as a good first step.

Jonny Quest wrote: I faced the same dilemma. I had the throttle-body TFI and ProTech. 1 of the 4 injectors had failed. I couldn't find parts (injectors). Rather than try to cobble something together that may or may not work, I pulled all the ProTech stuff off and threw it away. Next, I pulled off all the EFI related fuel system stuff and replaced with new carburetor system gear. Everything is now "old school" and fixable by me. DUI / HEI Distributor. Mechanical fuel pump. QuickFuel carb. The Ford H.O. engine runs great. Perhaps I lost 10 H.P. or so, but from my perspective, this was the only way to go. JQ

I went poking around with the multimeter and confirmed that there is only one wire that goes between the Protec module and the fuel injection module. This wire also shared continuity with one of the wires at the trigger connection (where the distributor would be on a normal engine). It seems to me that it is in fact just the wire for engine speed (or tach).

I have a fully functioning system right now, but knowing that at some point it will fail, I'd like to learn about the system while it is working.

My biggest question is why does everyone say the EFI won't work without Protec. "Because it won't" isn't an acceptable answer to me, I'd really like to understand why.

Any of you guys that have converted still have your non working ignition or tbi units? I'm interested in them to study them a little closer.

Gary S wrote: Rob- just curious,you had I assume a electric fuel pump which you had to replace. Was there a blanking plate where the mechanical pump normally was? So when you added the pump the eccentric use to run it on the end of the canshaft gear was already in place?

Gary: Yes, the TBI had low and high pressure fuel pumps. I removed both from the engine with the associated electrical feed and fuel lines from the fuel / water separator. I ran new fuel feed lines from the fuel / water separator up to the new block-mounted mechanical fuel pump. No big deal there.

Fuel Pump Block-Off Plate. Yes, my engine had a block-off plate common to the Ford small blocks I've seen. It is located on the port side of the engine block near the front and the fuel pump is mounted just below the alternator. The block-off plate had 2 bolts which were easily removed. I put a little dab of grease on the pump actuator arm and maneuvered it into position. I had to rotate the engine a bit to make the install easier by finding a place on the cam lobe where the the pump actuator arm did not need to be depressed . It seemed to be easier however than the old Chevy style where you had to hold the fuel pump push-rod up while inserting the pump actuator arm.

I'm fairly certain that the cam shaft for either a TBI or carb engine is the same. As such, the Carter mechanical fuel pump fit perfectly and mated-up with the stock cam shaft.

JQ