Recheck everything i would suppose. A diagram of exactly what each pin would be useful.
Now you will know what these wires are
46 seems to be a common signal return. You you unplugged the MAP sensor vacuum and plugged the hose at the engine side right?
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif
Now you will know what these wires are
46 seems to be a common signal return. You you unplugged the MAP sensor vacuum and plugged the hose at the engine side right?
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif
I have an A9L in my '87 that was an original AOD car that I converted to a 5 speed manual. It is also mass air converted. Other than the pin swap for the mass air conversion, I did not need to do any other pin swapping to use either the A9L manual trans computer or the C3W Auto trans computer.
Yeah but the MAP sensor vacuum cannot be connected to the intake manifold after the swap.
O2 Sensor harness interchange and modification
Originally Posted by 302EFI
Revised 16-Oct-2011 to add O2 sensor harness warnings
The wires for the 02's and low oil did not change throughout the years, they are all in the same place.
The main ones you need to worry about are (on the harness end (ECU) that plugs into the 02 plug) is:
\- 1. Lightblue / yellow
- 2. White / Purple
- 3. Purple / Yellow
The White/Purple & Purple/Yellow gets looped for a automatic ECU
The Purple/Yellow & Lightblue/Yellow for a manual ECU
See http://forums.corral.net/forums/gen...manual-auto-differences-year-differences.html for more O2 sensor wiring harness info
Basic premise to use with transmission swaps:
Only run a 5 speed trans O2 harness with an A9L. Do not run an Auto O2 sensor harness with an A9L. Doing so will damage the computer’s internal signal ground.
Only run an Auto trans O2 sensor harness with an A9P in a car that has an Auto trans. Using a 5 speed trans O2 sensor harness with an Auto trans will cause no crank problems.
See http://www.stangnet.com/mustang-forums/749974-computer-issue.html#post7490537 for Joel5.0’s fix to the computer internal signal ground.
90 model year harness only works with 90 model cars without inspection/rework.
The 4 cylinder O2 harness uses 4 wire O2 sensors. It probably won’t work correctly without modifying it.
Originally Posted by 302EFI
Revised 16-Oct-2011 to add O2 sensor harness warnings
The wires for the 02's and low oil did not change throughout the years, they are all in the same place.
The main ones you need to worry about are (on the harness end (ECU) that plugs into the 02 plug) is:
\- 1. Lightblue / yellow
- 2. White / Purple
- 3. Purple / Yellow
The White/Purple & Purple/Yellow gets looped for a automatic ECU
The Purple/Yellow & Lightblue/Yellow for a manual ECU
See http://forums.corral.net/forums/gen...manual-auto-differences-year-differences.html for more O2 sensor wiring harness info
Basic premise to use with transmission swaps:
Only run a 5 speed trans O2 harness with an A9L. Do not run an Auto O2 sensor harness with an A9L. Doing so will damage the computer’s internal signal ground.
Only run an Auto trans O2 sensor harness with an A9P in a car that has an Auto trans. Using a 5 speed trans O2 sensor harness with an Auto trans will cause no crank problems.
See http://www.stangnet.com/mustang-forums/749974-computer-issue.html#post7490537 for Joel5.0’s fix to the computer internal signal ground.
90 model year harness only works with 90 model cars without inspection/rework.
The 4 cylinder O2 harness uses 4 wire O2 sensors. It probably won’t work correctly without modifying it.
x2, I run an A9P automatic computer in my car. It was factory Cali Mass Air automatic. Now is 5spd. No re-pin.
After I decided I wanted to try another ECU to correct some of my drivability issues I found this out. I ran the number on my old ECU and found it was a factory 88 Mass Air ECU for an automatic. Which made NO sense cause the car is a stick. I figured it had a mass air conversion up till this point. After some research I found it was indeed a California 88 mass air car with an automatic. Converted to 5spd. Not mass air converted. Anyhow, I couldn't find a A9L at the local swap meet so I bought the automatic one and threw it in. It runs 90000+ times better. Then I read afterwards that had I put the A9L in it I would have burned it up had I not repinned or replaced the O2 harness. Got Lucky