A9L computer

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glopez4433

Well-Known Member
#1
#1
anyone have a A9L computer for a foxbody? i need a computer for my fox she used to be automatic shes now stick supercharged and some other adders but my computer is SHOT doesnt really have to be A9L just anything that works with the fox? thank you all
 
dsblk93gt

dsblk93gt

5.0 Moderator
#5
#5
It could be a wiring issue as well, check Pin 1 on the ecu and make sure it is seeing 12 volts, if not it is a wiring issue. If it is getting 12 volts the computer might be toast.
 
dsblk93gt

dsblk93gt

5.0 Moderator
#6
#6
glopez4433 said:
when i get codes it says RAM and ROM memory Failed.... so i figured what else could it be? and my comp is an A9P
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You should stick with an A9P then as the o2 sensor harness is different from auto to 5spd. Most people have no clue about this. The o2 sensors will not work correctly and you will be stuck in open loop.
 
dsblk93gt

dsblk93gt

5.0 Moderator
#7
#7
Oxygen sensor Harnesses - Manual/Auto differences and year differences - Ford Mustang Forums : Corral.net Mustang Forum
AOD O2 harness and A9L/A3M computer = bad
5 speed O2 harness and A9P = will work (but again isnt correct)
If you are running O2's, you must match the o2 harness to the computer.
AOD harness/A9P
5 speed harness/A9L/A3M

DO NOT INSTALL ANY OLD O2 HARNESS ON A CAR WITH A A9L OR A3M COMPUTER. YOU WILL BURN THE BOARD. IF YOU ARENT SURE, THE YOU SHOULD CHECK YOUR O2 HARNESS CONNECTOR.
Just because things plug together doesnt mean all is well. As rednotch has stated over and over again. The o2 sensor harnesses are different because of the neutral start/safety circuitry that is part of them. If you do a trans swap such as AOD to 5 speed, then by all means just leave the AOD o2 harness and computer. Same with a 5 speed to automatic. Leave the 5 speed harness and computer. I am not sure who started the rumor that if you do a trans swap, you must swap the computer. I ran my current car with the A9P for a long long time after I did the 5 speed swap without issues. I have had quite a few others that were automatics with A9L's. Again no issues.
Click to expand...
 
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glopez4433

Well-Known Member
#8
#8
thank you so much for that very important information and relieving me off burning computers.... does anyone have an A9P computer please?
 
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