hey guys. i'm new to these EFI gas burners, but i'm building a 5.0 right now to replace the 4.9L that was in my 1994 F150. the 5.0 is from a '92 f150. so far i have the engine torn down but it's going back together this week so i gotta get the MAF ready and all the wiring so i can get the engine started up. what all do i need to do??? the truck i'm putting the 5.0 in was a 4.9 so it still has all the 4.9 wiring harness and computer in it, but i have the complete 5.0 harness from the same '92 i took the engine from and the computer as well. does that make any sense? haha.

The engine has 9.08:1 flat top pistons, gt40p heads, E303 cam, and typhoon upper and lower intake. im going to go ahead and put 24lb injectors in it while everything is apart and i also have a smog pump eliminator also. So i saw on summit that they have the MAF sensors for different injector flow rates and everything and probably end up getting one of theirs, but if anyone could tell me what else i need to do to the MAF conversion and perhaps tell me what i need to do to hook it all up i would greatly appreciate it.

Thanks

 

You need a different computer. The one you have is for the MAP sensor.

 

https://www.ford-trucks.com/forums/8...onversion.html Do a search and you will find more threads like this one with some good links.

 

You will need a radiator for V-8. 6 Cylin. is different. You will need the computer an MAF sensor from V-8 donor truck. Also you will have to remove the brackets that the motor mounts attached to on your 6cyl. On crossmember. And then you will need the brackets outta a V-8 truck to bolt in directly behind the crossmember. Also make sure the truck your harness is from is for a MAF truck an not a speed density because the injectors are wired differently between a speed density an a MAF.

 

Is it a stick or auto ?? If its a stick you can use the computer from a 5.0 mustang , if its a electronic controlled auto you will need the computer out of a mass air auto truck & all the harnesses ... Lew

 

ok i will clear some things up here. haha

the truck i got was/is a '94 single cab short bed 4x4 5 speed. i pull the 4.9 out of it and putting the 5.0 in so i bought a complete donor truck that had been rolled that had a 5 speed and 5.0. so i got the radiator, engine stands that bolt to the crossmember, everything except the correct computer system to run the MAF.

Lew, with all this said you say i can run the stang computer. which stang computer and does the stang computer require any different injector wiring to hook up the MAF? i was reading somewhere someone switched to like HO or whatever and was having to change out the injector wiring for whatever reason. i will read that link now. hopefully its relatively easy to hook up the MAF!!! haha. thanks guys. i appreciate this. i can do everything to this truck but when it comes to this swapping to MAF i'm like WAYYY over my head so far and i'm confused. hopefully y'all clear up my confusion. LoL

 

Your using the E 303 roller cam so the firing order is the same as the HO ,. It should work fine with the upgraded mass air meter , most aftermarket meters are set for the mustang , but you may need a custom tune after ?? ....Lew

 

I would really check everthing out first & see what is the best way to do this . Theres going to be alot of wiring either way , the HO is ob 2 & your 92 is ob 1 but not MA , You could also get the comp & harness out of a 95 mass air truck thats ob 1 , might be easyer ???? ... Lew

 

As long as the harness came outta the with MAF already then the injectors will be wired correctly. And as far the wiring for the MAF meter, the wires for it are over near the air box. Should be able to see it comparing the 2 trucks harness.

 

If i get the '95 harness, computer, and the MAF would the injector wiring be the same as mine or would i have to change the injector wiring?? i'm so confused right now its not even funny expecially after reading the stuff in that link. guess i don't know enough about these little trucks yet.. haha

 

The injector wire in a 95 5.0 is SFI.

 

ok so pre '95 they were bank and then '95 and up were sequential.. got ya. now, what would i have to do to wire up the sequential? or would i just get a '95 harness with the injector wiring already done sequential with the factory MAF and computer. would all that directly swap over or would i need to do some major surgery? if it will swap i will call some JYs around here and look for a '95 computer and harness.

Also what would the difference be if i was to use a stang computer in the way i would wire it all up? use stang computer and maybe the '95 harness????

 

Yes the 95 harness & computer will be SFI & mass air with the 351 302 HO firing order . I have a 302 HO in my 95 with the e 303 cam & it was a direct swap . The 95 trucks are mass air roller cam motors with obd 1 computer...

 

No, 94 5.0 and up were sequential.

 

ok cool. my engine was factory roller cam non MAF OBD1 and didn't have SFI. i am learning more and more here. so my E303 will work with my engine. i just gotta get a '95 harness which is the HO firing order and put the '95 harness on here. so would i have to rewire the '95 harness at all??? it doesnt sound like i would have to do too much to it

im very sorry if i'm being a pain in the a$$, but i literally jumped on this project NEVER having worked with these EFI gassers before. haha. probably shouldn't have jumped into it, but i'm there now so i gotta get it done so the engine will run. haha