I picked up a donor 302 from a 96 f150 which is EEC-V. I am planing on swapping this into a cj5. Is swapping from the V to the IV as easy as getting a computer and wiring harness from an IV and using that?

 

So you want to use an EEC4 computer on this engine right? If so that's fine just get a complete harness and computer from an 92-95 truck and plug it in ignoring the extra EEC5 specific sensors.

 

Thanks. One more follow up question. Would using a mustang harness from rjm work as well?

 

Not quite. For one thing, Ford changed their connectors at the time of the change from IV to V, so you'd need the EEC-IV era sensors that plug into the EEC-IV harness. Those sensors may not all be one-for-one swaps - for example, your V uses a MAF input and the IV may be Speed Density.

Is the CJ a manual transmission? That eliminates any concern about auto transmission control.

 

Yea it's stick. I wouldn't worry about it anyhow because from what I have gathered if there are no inputs for the transmission wire the computer defaults to assume manual transmission and then puts out a code. I don't have to pass emissions here in NM so having codes is not a problem.

 

No.. if the computer doesn't see the transmission it goes into limp mode which can limit engine power output, so you'll be much better off using a computer that isn't designed for an electronic transmission.

 

Thanks for the clarification.

 

Yes.. with a mustang computer.

 

Using a mustang computer on an f150 won't cause issues with injector sequence or because of the different cams?

 

With the exception of some California vehicles, all EEC-IV applications are batch-fired (EFI) rather than sequential (SEFI), so no concern there. It shouldn't be a concern regardless I would think.

As for the cam differences, there may be some minor differences in ignition timing and fueling, but you're going to have that regardless due to a myriad of other factors. But the differences should be minor - something you could likely play with via base timing and fuel pressure changes, if not custom tuning.

As for the PCM, best to just get one from a 5-speed application - they should be just about as available as ones from an automatic. But, I'd advise inspecting it as you'll likely find leaking capacitors which should be replaced.

 

All 5.0 engines built after 1994 use the HO firing order so you're safe there, and all Ford MAF systems for V8s use sequential injection so you will need a sequential injector sub-harness to use a MAF computer, an aftermarket swap harness will include this or you could create it from a donor harness if you were doing an upgrade on an older SD EFI Ford pickup. Cam differences aren't as much of a concern with MAF either as it has greater capacity to adapt.

 

So it is as simple as getting eec4 manual transmission mustang computer, harness, and then any sensors that don't sirectly swap?

 

For the most part sensors are the same but the connectors may be slightly different and some devices are located in different places on the cars versus the trucks. If using a truck motor it makes sense to use a truck harness, if you pull one from a donor you can delete all the extra transmission wiring or OBD2 stuff, and a Mustang computer will plug into the truck harness no problem but some pins have to be moved around due to pinout differences. The big benefit of using a Mustang computer is compatability with aftermarket tuning systems, if you buildup this motor in the future you can buy relatively cheap tuner hardware that will allow just about any combination of parts to run like a stock motor, and you get away from the hastles associated with using a truck computer. You won't have any luck finding a MAF truck computer for a manual trans, I have never seen one and I'm not sure they even exist.

 

So this harness (RJM Injection Tech — 5.0L Universal Kit Harness) and mustang computer pre 93 for manual transmission and all the sensors should work then? Thanks for your patience.

 

I have a 1996 4.9(300i6), manual trans, EEC-V (that's MAF). The 302 of the same vintage was MAF as well and could be had with the manual transmisison.. I'm curious as to why he's converting back to the the speed density as it's not as friendly to cam swaps and other performance mods. I would think a pertronix dizzy and edlebrock intake and carb for a jeep.... Unless he want is to run upside down....