EFI,(my head is spinning, its starting to slow down.)

[beaux312]

I got a A9S off of Ebay for about 130

 

[fordtrucks4ever]

If you have access to an all ford bone yard, get a complete motor package with all wiring and ecm from one donor vehicle. You could use T-bird/Cougar, Mk VII, Exploder, Crown Vic, and any F-series if you change out intakes and fuel rails. The pinouts may be diffferent from the 88-93 Stang, but basic conversion is same. I prefer the Mk VII because they are not usually hammered like Mustangs and trucks. I have pulled 4 motor packages from donor cars at bone yards. They all averaged around $200 for everything you could possibly need for a conversion. Two were even complete with AOD's. I researched and then started digging under hoods of just about every car/truck that had distribution boxes. Finally settled on some Mk VIII, full size Lincolns, newer Exploders, and really liked what I found in the 95 and newer Dodge trucks. These have fusible links, small fuses and hold enough Bosch style relays to route everything thu the one box. By modifying the stock efi harness and running everything thru the distribution box, I eliminated all of the old fusible links in old efi loom and fused everything for the conversion. Then added relay for headlights and anything else that draws high amp load. The efi can be a stand alone system only needing a few wires from existing Bronco wiring to power up all of the relays. Auto electrical has always been one of my weak links, but after a lot of self educating, it makes sense now. Easy to diagnose an efi ailment now. A few years ago I would have been scratching my head and wondering how the thing even worked. Just throwing parts at it because someone told me they had a problem once and this fixed it...

If you want suggestions on what donors are best here is what I recommend. Any 5.0 HO motor with a roller cam from a car. This can include 88-93 Mustang, 88-91 Lincoln Mk VII, 91-93 Cougar/T-bird. There are others that will work equally well. Doesnt matter if speed density or maf, if all of the parts are from same donor to eliminate a bunch of mis-matched problems.

 

[stupidboy]

My guy has none with mass air and thats what I'm doing.. Is a tps a tps or do they have different values and the same with air bypass, are they all the same with a different plug? I am using a 97 explorer tb and want to just use the tps and air bypass thats on it, I have the plugs for them, can I do that using 88-93 stang ecm?

 

[markperry]

My guy has none with mass air and thats what I'm doing.. Is a tps a tps or do they have different values and the same with air bypass, are they all the same with a different plug? I am using a 97 explorer tb and want to just use the tps and air bypass thats on it, I have the plugs for them, can I do that using 88-93 stang ecm?

Did you check your e-mail I found a Mustang MAF ECM on e-bay for you, for 75.00

 

[Viperwolf1]

My guy has none with mass air and thats what I'm doing.. Is a tps a tps or do they have different values and the same with air bypass, are they all the same with a different plug? I am using a 97 explorer tb and want to just use the tps and air bypass thats on it, I have the plugs for them, can I do that using 88-93 stang ecm?

Yes you can.

 

[stupidboy]

Did you check your e-mail I found a Mustang MAF ECM on e-bay for you, for 75.00

I saw that, the #D3D was not in the list at rjm so I was not sure, is it one that I can use? RJM lists a D3D1??:?

 

[markperry]

I saw that, the #D3D was not in the list at rjm so I was not sure, is it one that I can use? RJM lists a D3D1??:?

Yes it was I double checked it before I sent it to you
– 1993 Mustang Computers
This is copied from Ryans website?
These are typically the most desirable Ford EFI computers. These computers can be identified by the following program codes; A9L, X3Z, A3M, A3M1, D3D1, S0Z, A9S, A9M, A9P, C3W, and C3W1

 

[tobyw]

Sooooo.... Is a complete running/driving '89 Crown Vic a good donor vehicle? Will the RJM harness plug right in or is the pin-out different than the Mustang?

 

[fordtrucks4ever]

Most of the Crown Vics were not HO motors and dont have roller cams. If a retired police car then going to be run into the ground. But its still a good efi motor and a lot of conversions done from them. I have one in a `65 F-100 with AOD. The pinouts will be different between just about every model of vehicle. There is no big advantage of using a Mustang ecm other than a large amount of conversions are based on these. A speed density ecm also has different pinouts from maf. Its not hard to move the pins to correct location, if you convert to maf or mustang ecm, but there are a lot of them and easy to make a mistake if not paying attention. The 88-93 Mustangs are most popilar swaps because of the large Mustang crowd and forums available. If you use a Mustang ecm, just about any efi motor can be used with the RJM harnass, but some sensors and injectors may need to be changed out to what fits the 88-93 Mustang.

 

[Viperwolf1]

Sooooo.... Is a complete running/driving '89 Crown Vic a good donor vehicle? Will the RJM harness plug right in or is the pin-out different than the Mustang?

According to the chart here, http://fordfuelinjection.com/5.0Lpinouts.html, the pinout the same as the mass air mustangs except for the MAF which isn't used on speed density. I don't see why you couldn't use the RJM harness with the crown vic ECM as long as you used the vic injectors. You would be able to upgrade later with a mustang ECM, 19 lb injectors and a mustang MAF also.

 

[tobyw]

According to the chart here, http://fordfuelinjection.com/5.0Lpinouts.html, the pinout the same as the mass air mustangs except for the MAF which isn't used on speed density. I don't see why you couldn't use the RJM harness with the crown vic ECM as long as you used the vic injectors. You would be able to upgrade later with a mustang ECM, 19 lb injectors and a mustang MAF also.

Plan A would be to swap the entire motor over to the Bronco. If I get into it and that doesn't appear to make sense, I would just pull the EFI stuff and swap it over to the Bronco 302. Either way, I would be using all of the stuff from the Vic, including the injectors and (hopefully) the computer... So according to that pinout diagram, I would be good to go?

 

[Viperwolf1]

Plan A would be to swap the entire motor over to the Bronco. If I get into it and that doesn't appear to make sense, I would just pull the EFI stuff and swap it over to the Bronco 302. Either way, I would be using all of the stuff from the Vic, including the injectors and (hopefully) the computer... So according to that pinout diagram, I would be good to go?

Yes. The only potential problem I can think of is the RJM harness is built assuming a passenger side throttle body. Most SD motors have a driver side throttle body. You can swap it by extending some wires or you can change the fuel rail and swap the upper intake around.

 

[tobyw]

So here are a couple dumb questions:

If I use the RJM harness on the SD motor, what happens to the MAF connector? It just lays there? And this doesn't cause anything to freak out?

I just so happen to have a 94-95 Mustang MAF, complete upper and lower intake, and a T4M0 computer. Would any combo of those parts and the Crown Vic parts make a simpler swap?

 

[Viperwolf1]

MAF connector is fine unplugged. It won't cause any problems.

'94-'95 MAF is good when you upgrade to mass air, Useless for speed density.

T4M0 is not usable with RJM harness unless you want to do a lot of ECM connector re-pinning.

Mustang fuel rail will allow you to swap the cv upper intake around. Mustang injectors are good for upgrade later. '94-'95 mustang intake can be used but it's more restrictive (shorter) and puts the throttle body at an angle. Throttle body bolt pattern may be different too.

 

[tobyw]

MAF connector is fine unplugged. It won't cause any problems.

'94-'95 MAF is good when you upgrade to mass air, Useless for speed density.

T4M0 is not usable with RJM harness unless you want to do a lot of ECM connector re-pinning.

Mustang fuel rail will allow you to swap the cv upper intake around. Mustang injectors are good for upgrade later. '94-'95 mustang intake can be used but it's more restrictive (shorter) and puts the throttle body at an angle. Throttle body bolt pattern may be different too.

Yep, I just read on another forum that the 94-95 TB has a different bolt pattern, so the upper I have is useless... But it sounds like I can rob the fuel rail off of the lower, keep the Vic injectors, swap the Vic upper to the passender side orientation, and run the RJM harness with the MAF unplugged and use the ECU from the Vic! Thanks for all your help this morning Viper!!

 

[68mutgt]

You should look at a Ford Racing catalog. Look at part number M-12071-A50. This is a complete harness from PCM to injectors. It's not cheap but it's new...and it's complete. Will fork well with any EFI 302/351w based motor. A 351w (or stroker) with a Trick Flow intake, cam and AFR heads will get you anywhere you want to go.