MASS AIR AND SPEED DENSITY ECU NUMBERS

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(THIS INFORMATION IS BROUGHT TO YOU BUY NEOMUSTANGS. ANY OTHER PUBLISHER CLAIMING CREDIT IS FRAUD)
HERES A LIST OF SOME OF THE COMPUTERS THAT I HAVE LISTED BELOW. MOST ALL THE COMPUTERS FOUND IN A FOX BODY MUSTANG ARE ON THAT LIST. THERE MIGHT BE A FEW THAT HAVENT BEEN ADDED BUT NONETHELESS I WILL ADD THEM AS I GO. IM PRETTY SURE ITS 99% ACCURATE AS IT SITS. PAY ATTENTION TO THE PARAGRAPH BELOW AS WELL. WHEN SWAPPING AROUND COMPUTERS ITS IMPORTANT TO READ THAT AT LEAST.


A9L - 89-93 5.0L 5-spd
A9P - 89-93 5.0L Mustang Auto
A3M - 93 5.0L Mustang 5-spd
A3M1 - 93 5.0L Mustang 5-spd
X3Z - 93 5.0L Cobra 5-spd (calibrated only will work on 24# injs and matching cobra maf)
A9S - 88-93 5.0L Mustang California (second? mass air ecu made in 88)
8LD- 88-93 5.0L 5Speed California (first mass air ecu made in 88)
A9M- 92-93 Convertible 5 speed (same as A9L honestly, when compared to a9L in the .bin department same ecu but A9L has a bit more spark)
C3W - 89-93 5.0L Mustang Auto
DA1 - 87-88 Speed Density 5.0L Mustang 5-spd
DC- 87-88 Speed Density Auto

one more very important thing i wanted to add to the thread. When converting an aod to a
5 speed car . Or when converting a 4cyl body to a v8 you have to pay attention to what harness you use along with the computers. Most of you already know the majority of mustangs used 2 computers. A9p (auto computer) and a9l (5 speed computer). A9p however can be used in a 5 speed car so it makes it sorta "universal". The a9l however can not be used with an aod. The A9P computer however has a more agressive timing curve making it a nice desireable computer for 5 speeds. Even the the A9P computer uses an older GUF system, it makes it really hard to tune with. The best way to tune if you do go that route is to tune with an A9L because the A9L has all the same logic + some and uses a different GUF system.
(THIS INFORMATION IS BROUGHT TO YOU BUY NEOMUSTANGS. ANY OTHER PUBLISHER CLAIMING CREDIT IS FRAUD)
With that being said lets take for instance you were converting that old tired aod car to a 5 speed. Figured why not get the a9l computer too right? If you were to put an a9l computer into an original aod car without repinning or replacing the 02 harness you would fry the computer. Hense sending the car limpmode if not worse not running at all. If you were to keep the a9p computer in the car with the aod 02 harness everything would be fine however you would have to make sure you unplugged the jumper for the neutral safety switch and pluged them into the pedals you installed! Keep in mind, a9p computer and 02 harness will work fine however people have reported problems with idle and stalling for no reason going this route. The A9P code is missing some idle control logic that the A9L has. And the settings in the code that's common between the two are fairly different. It's quite possible for someone to notice the difference between an A9P and A9L, but surprisingly MOST people with manual trannys don't. In fact, the only people that notice the difference are people with automatics that replace their A9P (tuned for automatics) with an A9L (tuned for manuals). What they notice is when they put the tranny in gear, the engine could stumble or completely conk out when the tranny loads up the engine in drive/reverse. With a tuning device, this is 100% tunable for in the A9L because the A9L has ALL the code the A9P has...just different settings/parameters.


Harness' for fox bodys are not created equal. As mentioned about 87-88 were speed density years. 88 did have a mass air harness and they were for mustangs that were sold to california only because thats when c.a.r.b was formed. The epa people. Thats why 88's have the provisions to be converted and not the 87's. 88 is still a good harness to convert to mass air to be like an 89 clone harness. All 89 mustangs were mass air so the harness will retroactively convert to any 87-88 car as well just keep in mind about the 02 harness's mentioned above when converting to 87. IN 1990 all bets were off. Thats kinda a bastard year as it only plugs and plays to itself for that year. For instance 90 couldnt be used in an 89 or a 91. In 1991 it was universal for all 91 and 92 cars up to a certain "production" date. Theres some reports of late year 92's having 93 harness's or being compatible with 93 mass air harness . Again im a little iffy on that one. Im sure lew will chime in somewhere and fix me on that. 93 was another bastard kinda year that was plug and play for itself.
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