My son and I have been working on the 5.0 EFI swap for his 71 Maverick. I just posted a few pictures of it in the gallery. We are currently working our minds through the wire diet. We figured out today that the "91 MAF" wiring harness I purchased was actually an "88 MAP" harness. Now what to do? Regroup and continue on. We are hoping to go ahead and make use of the 88 harness and computer to get up and going till we come up with an honest salesman with the correct 91 parts. We are anxious to hear the progress.
No need to replace the harness, it can be converted to mass air pretty easily. Search around on Google and stuff and you'll find tutorials on it. But I agree with safado, no need for mass air on a stock or mildly modified engine.
as said no need to scrap that harness. the speed density system was faster that the maf system on stock and near stock (stock cam and heads) motors. later if you modify the motor you can then do the maf conversion. ive done it. you can get a maf plug with the wires and thats all you need to convert the wireing to maf. then you just need a computer and maf sensor. the speed density doesnt require a speed sensor or a fuel pump sensor.
I am using the harness from an '86 Grand Marquis in my car that I converted to mass air. It wasn't difficult to do. From what I remember, I had to take the EEC connector apart, swap a couple of pins and then add pins from the MAF harness. I bought a kit at the time that came with the EEC (basically from a '93 Mustang) and the harness and instructions on how to do the upgrade. By the time you get done with the EFI install you'll be really comfortable with wires, so adding a few more if you decide to go mass air will be a piece of cake.
Run What You Brung! Hey, thanks all. Good advice. We had decided to go ahead with the MAP system in that all is stock. This is all for my son and is his "shop class" for school and life. He will be experienced to tackle the upgrade to MAF in the future should he decide to up the ante in time. My problem is that all of my collection of wiring diagrams are for the MAF system and all wiring is not the same. We worked on it some yesterday and I believe I have sorted out some of the conflicting wires. Mainly - we have two 8 pin plugs (one black one white) that I have no idea where they go. It appears that they must be accessories that we do not have and can therefore be trimmed out. While on the subject - what about the electric fuel pump? My idea is to adapt an in tank Mustang pump to the Maverick fuel pickup, use the inertia switch, and wire it as normal. Anyone have experience with doing it that way? Tomorrow afternoon is our official work on the Maverick day for the week so neither one of us can wait to get at it again!
Steve On my EFI mav I used a mid 80 f150 frame mounted boost pump and mounted it in front of the tank on the right side just in front of the stock fuel pick up . As for fuel lines I bent all new steel lines 3/8 for deliver 5/16 for fuel return .. Jay
Steve Due a search EFI feul pump. Go to efi pump for a 306 mav . Go to post # 16 -17 you will see the pump I used and the fitting I made for the hard fuel lines . JAY
Jay - thanks for the help. I tried to do the search to look at your setup but I must not be site savy enough to locate it. So in essence you just hooked up a F-150 electric pump near the tank and that supplied both the volume and pressure that you needed? My son and I spent our afternoon today dropping the T-5 to put in the new correct block plate and hook up his e - brake. He has misplaced a few pieces (and we did not take before pictures to remind us) so we did not get that quite done. What about hooking up the alternator. Is it easy enought to splice the 5.0 alternator into the original harness or should we adapt the original Maverick alternator to the motor. The Maverick alternator looks as though it will swap in. Does the 5.0 alternator have a built in voltage regulator?
your beter off puting the 3g alt in. its found on 94 and newer fords. you have to grind the mustang bracket a little to make it fit. then to wire it check out the write up in the tech section
Steve I used the charge harness form my donner car a 88 mustang . If you use that one it is in the head light loom and you will need to remove it from the loom. JAY
I got sidetracked on the Tech ariticles and forgot to thank you all for the information. There is a lot of good information on those tech pages. Anyway, what would be the benefit of going with the latter 3G alternator instead of using the original? Does the 3G have a built in voltage regulator. if so that would clean up that part of the under hood picture.
Built in Voltage regulator and higher charge output. 130 amps versus 65 amps. Its a necessity once you go to an electric cooling fan and run EFI.
