im looking to by a 86 4cyl mustang notch. i have a 91 mustang gt harness, efi 302, aod, 8.8, a9p computer, v8 ds, and a 255 fuel pump with a pick up brack. what else do i need to swap this into the 86? what 02 harness do i need? will thier be problems with the dash wiring i that i will have to adress? lmk thank you.
4cyl To 5.0 Swap Help
- Thread starter rustyruststang5
- Start date
Not sure about the dash wiring but you need to get a O2 harness from a car with the same A9L you are running using a o2 harness out of an Auto will fry the pcm. The reference return for the pcm runs through the harness and loops at the connector you can get one for an auto then repin it that is what i did.
you need the headlight, and o2 harness from the 91 as well. the dash harness is not compatible with the 91 harness either.
rd
Founding Member
Try the search function, there are bezillions of threads on this. At present, it would almost be easier to get a 5.0. But the changeover is common and theres lots of experience around.
IMHO since I have done this....the hard way. I wouldnt even attempt it without a complete v8 donor car. With the harnesses you are missing you are already looking at 200+ dollars. Not to mention you are going to want the V8 k-member, brakes, exhaust, and sway bars.
stangman11
Member
When I did my swap on my 92 a doner car really is the best way to do it especially in an 86 the dash harness wont work with the 91 engine harness.
You need a dash harness from a 91. I want to say 91 was a weird year as it's harness it's not compatible with another year.
ID89GT
10 Year Member
And a 91 dash harness won't plug into the 86 dash stuff.. so really you would have to swap the whole dash along with all the electronics.. Would be much easier just to find an 86 5.0 harness and swap that then to try and get the 91 stuff to work.
