Mass airflow conversion help
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Freshman User
Joined: Feb 2005
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From: Grantville, PA
Mass airflow conversion help
A friend of mine has an 89 F-150 with a 5.0 and a 5 sp 2 wheel drive. We are wanting to convert it to mass air for future upgrades such as a cam and intake. It already has headers and a cold air intake and ocassionally at idle it dies. I know you can buy a complete kit, an overlay harness, a wiring harness out of a newer mass air truck with a 302, or try to make your own harness using a mustang harness. I want to know the pros and cons of each setup including ease of installation. price is also a factor so the complete kit is out. Also will a wiring harness off of a newer truck work with a Mustang computer or will the injector firing order have to change? Or is the 94-95 truck harness still a batch or bankfire system? Love the truck just want more adaptability for future upgrades. any help would be greatly appreciated, also what would be a good cam for this truck, we want it to be a street/strip truck eventually but nothing drastic yet.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
It would be easier to use the mustang computer and engine wiring IMO.. and the cheapest route is pulling it from a wreck of course. You could add the mass air meter and sequential injector wires to the truck harness with the wiring pulled from the mustang harness. Another approach would be to just use the complete mustang engine harness, but some components like the throttle body will be in different locations. Of course if you use the mustang intake as well you'll solve that and other issues. There are cams available that will work with the ED EFI system(as well as mass air), and any of them are a large upgrade from the stock cam in that motor. Consider the Comp 31-255-5 for the truck as it is now, or the 35-255-5 once you add mass air and change the firing order. The cam in my sig is also a good choice for SD or MAF motors but it also has the HO firing order. And in case you didn't already know that motor has a flat tappet cam.
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From: Concord, NC
Another approach would be to just use the complete mustang engine harness, but some components like the throttle body will be in different locations.
FTE Legend
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From: Ottawa, Ontario
Originally Posted by EPNCSU2006
Nothing on a mustang harness is in the same location as the truck harness with very few exceptions.
Lead Driver
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From: Concord, NC
That part of the harness is similar enough to work, but the rest of the harness back to the computer is substantially different. The ECU is on the passenger side of the mustang and the harness will not reach to the drivers side kick panel location of the truck ECU. The coil is also mounted on the fender in a mustang, etc, etc. The injector harness is about all that can be used from a mustang harness. I've done the swap personally, and I don't see how just slapping in an entire mustang engine wiring harness is a viable solution to the mass air swap. Using parts of the mustang harness to add the necessary pieces to the truck harness is a much better idea.
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Joined: Jul 2006
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From: Central PA
Hello from a fellow PA . Get the complete harness engine and fire wall from a 94-95 302 truck with MAf they r sequential . Then remove wire not needed in fender harness. (i have done 3 swaps (1 on the 92 down using stock parts ) I hate to repin id rather remove all wire for the lights etc and separate harnesses (in cab and ecu to motor )
The only problem is the MAF is on auto only trucks outside of CAlifornia. So you can get a tweecer for the tranny and use the 302 auto ecu . Or repin and use the stang ECU . At least get a MAF engine harness (1 Air sensor was moved to air box. easy rewire) and you will have to add wires for the sequential injection to the ecu.
There is a really good write up if I find it I'll repost
The only problem is the MAF is on auto only trucks outside of CAlifornia. So you can get a tweecer for the tranny and use the 302 auto ecu . Or repin and use the stang ECU . At least get a MAF engine harness (1 Air sensor was moved to air box. easy rewire) and you will have to add wires for the sequential injection to the ecu.
There is a really good write up if I find it I'll repost
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Freshman User
Joined: Feb 2005
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From: Grantville, PA
Thanks I thought there was a good writeup on here before but I couldn't find it. I wasn't sure how old it was. I was hoping the truck harness from a 94-95 would work. That to me would be the easiest and cleanest looking. Maybe I can find one at our neighborhood junk yard. Thanks to all for the info.
