94' 5.3L into an 86' 302 EFI

[radzilla66]

Originally I was going with another 302 or the Bronco but I picked up 94' 351 instead. The engine is complete from the intake to oil pan and all the accessories up front. I still need to get the ECU and the second half of the engine harness that actually goes to the computer and the MAF sensor. Anybody out there done this before? If so, any advice would be very helpful. I really don't think I can use any of the old harness.? Thanks for any help.

 

[Seabronc]

Check out http://www.ronmorrisperformance.com . He has a good writeup on conversions.

Good luck,

>-

 

[radzilla66]

Check out http://www.ronmorrisperformance.com . He has a good writeup on conversions.
Good luck,

>-

From what I could see he deals mainly with 5.0s from Mustangs.......I know.....Same engine. What I need is someone who has has done this to tell me about the hidden demons.............I think if I use the whole 94 truck harness and get power to the computer I should be good to go, right? Eh, we'll see......

 

[Yardape]

No the best way to go would be to get all the parts from an 86 that had a 351 in it. Goto an auto wreckers and take evrything you can Off the 86. The computer, wiring harness, etc...

 

[BLADE262US]

You mean get everything out of the 94 right Yardape ? The 86 would have a very limited ECU in it and it was probably for a 5.0 that %.8 is going to take a different EEC . Your best bet would be to totally strip the 94 and put it all in your truck , every bit of wiring so that everything works when done . The firewall connector on your 86 is going to be round and the 94 is square so you will have to come up with something there , If your running a C6 you will have to make sure that the EEC you have is for a C6 one from an 87 / 88 / 89 will work fine . If your 94 EEC had an E4OD it looks for too many things from the tranny it will be a nightmare to get functional . You mentioned a mass air sensor , Can you verify that the motro you have is mass air ? There were a few but most all were speed density and finding an EEC that is set for a C6 with mass air WOW good luck . /emoticons/[email protected] 2x" width="20" height="20" />

 

[radzilla66]

You mean get everything out of the 94 right Yardape ? The 86 would have a very limited ECU in it and it was probably for a 5.0 that %.8 is going to take a different EEC . Your best bet would be to totally strip the 94 and put it all in your truck , every bit of wiring so that everything works when done . The firewall connector on your 86 is going to be round and the 94 is square so you will have to come up with something there , If your running a C6 you will have to make sure that the EEC you have is for a C6 one from an 87 / 88 / 89 will work fine . If your 94 EEC had an E4OD it looks for too many things from the tranny it will be a nightmare to get functional . You mentioned a mass air sensor , Can you verify that the motro you have is mass air ? There were a few but most all were speed density and finding an EEC that is set for a C6 with mass air WOW good luck . /emoticons/[email protected] 2x" width="20" height="20" />

The guy I got it from said that the motor came from a 94' F250. Not sure which tranny it had. Doesn't matter though, I have an AOD in the Bronco. Blade, are you saying that the ECU won't work if I don't hook up an E4OD? What about an ECU from a manual transmission truck? As far as Mass air, I think all California Fords had Mass Air in 94.

Is there a difference between the C-6 used in 80's Broncos and one in a 77' F-150 hooked to a 400.

 

[Yardape]

No in my opinion if hes putting it in an '86, get all the wiring for an '86. For me that would be the easiest swap, Your truck is already set up for an '86 engine so converting the 94 351 to 86 would be the most logical solution to me. If you switch the 86 to run with a 94 computer and wiring you are in for a wiring nightmare, but it can be done. Not saying my way is the only way but thats the way I would do it and I know I would be able to get it to work.

 

[BLADE262US]

What hes going to run into if he tries to use the 86 harness with that motor is that the 1986 was the first yr of the EFI things werent very refined at that point . You are correct about california and the mass air which is a very good thing if you have it all , With that system you can run close to whatever cam you want and do pretty much any mods you want . The ECU out of a manual truck would be fine if thats what you have if it had an E4OD it wont work without that tranny because the EEC looks for inputs back from that tranny and the AOD is a bit different too because of the OD the timing curves are a bit different , A C6 is a C6 no matter what yr only difference is its either for a big block or its for a small block the guts are the same but the bellhousing is part of the case ( one piece ) so its not like a C4 where you can just change the bellhousing . If I were doing it I would swap in the entire electrical system from the F250 , Its not going to be that easy to just put the 94 motor in the 86 and use the 86 harness especially with the mass air system . Also that should be sequential fire which is also a plus . /emoticons/[email protected] 2x" width="20" height="20" />

 

[Yardape]

Thats the point, they way I am suggesting you will not be using the mass air. Get everything that was on a 351 in 86 that is different. The engines are the same, the only things that are different are the bolt ons, strip it and re-install with '86 gear. Computer, wiring, PS pump, alternator, water pump (because the '86 uses v-belt) Upper intake if you have to, That to me would be the easiest most logical way. Installing all the 94 may sound easiest because you have most of the parts but I think that would be a wiring nightmare, Depends of course on your ability, my ability would not allow for what Blade is suggesting, I would be lost. But if you can do go for it, What I was suggesting makes sense to me because I can do it, you may not I do not know your ability. So those are your options anyway.

 

[Yardape]

The power steering pump may have different connections to what your Bronco has, the alternator may connect different. If you can figure those out and use the serpentine system that would be great

 

[BLADE262US]

I am not positive on this but being 86 was the first year of the EFI I think they only did it for the 302 every 351 Ive seen in that year has a carb on it and most were the 5.8 ** 4 barrel motor so finding EFI parts for a 5.8 in 86 may be an impossible feat . /emoticons/[email protected] 2x" width="20" height="20" />

 

[Yardape]

You are correct on the carb issue, That makes my point even firmer,switching to carb would be even easier to do than installing the '94 fuel injection components, but again that is up to your own ability and how much work you want to make for yourself.

 

[radzilla66]

You are correct on the carb issue, That makes my point even firmer,switching to carb would be even easier to do than installing the '94 fuel injection components, but again that is up to your own ability and how much work you want to make for yourself.

[/quote

The only problem I see with going carb is the CA emissons junk. I don't know how they hook up on carb models. I have all the emissions junk from the 94'. I am going to hunt down the rest of the wiring and computer and possibly a tranny this weekend. Is the vehicle speed sensor located in the E4OD or in the rear diff. I haven't looked to see if the 86 has one or not.?

 

[radzilla66]

Do you guys know if it is possible to use a Mustang 5.0L computer with a 5.8L? Seems to me the only problem would be the firing order.

Still trying to figure it all out. There are some harnesses out there I could buy to finish the swap, but they are pinned to fit the mustang computers. Any one know someone that has done this? Thanks.

 

[BLADE262US]

The firing order on most newer 5.0 ,s is the same as the 351W anyway so thats not that big of a deal what is a big deal is that unless its mass air ( I Havent messed with that one so I dont know ) The speed density EECIV is programmed with the motors air intake and timing events as constants , Being a 351 has more stroke therefore more air intake the 5.0 EEC would more than likely run too lean on a 351W . In other words dont try it just find the right one . /emoticons/[email protected] 2x" width="20" height="20" />

 

[radzilla66]

I am switching over to a MASS AIR system. (should have told you that, and I am not using the Bronco computer) As far as I can tell from reading fordfuelinjection.com, it shouldn't be any problem. Just have to get the harness, and a mustang computer w/ MASS sensor and of course the intake tubing to mount it. Thanks for telling me the firing order. That eases my mind some. Now, where to find the cash.......