Progress Thread C3W… A9L… A9P?

t1_5.0 · May 14, 2024

Hello everyone, I recently bought a 93 gt convertible. I noticed it used to be an automatic by the way it was modified to fit the manual shifter. Today I looked at the ECUand I have a C3W. I thought automatics were A9P and manuals were A9L. Is this something I should change? Is the C3W fully compatible with a manual if that’s what came with it as an automatic or is that something they might have swapped when they changed it to a manual or should I replace it with an A9L?

Thanks in advance everyone!

AeroCoupe · May 15, 2024

1988 MANUAL 8LD
1988 AUTO 8LF
1989 MANUAL A9L, A9S
1989 AUTO A9P, A9T
1990-92 MANUAL A9L
1990-92 AUTO A9P
1993 MANUAL A3M
1993 AUTO C3W
1993 COBRA X3Z

You can use the C3W ECU with a manual transmission as long as you use a manual trans O2 harness or rewire the auto trans O2 harness for a manual trans.

Good thread on it here:

Drivetrain - Can I Use A9p Ecu With A T5 Manual Trans

Doing a t5 swap in a 93 notch. Did a 5.0 swap on this car and used a AOD. Now I am collecting parts to do a t5 swap and I thought I read a while back you can use a a9p ecu on a 5 speed. I can pick up a a9l local for $75.00. Would it make sense to just change out the a9p to the a9l, what all is...

stangnet.com

Mustang5L5 · May 15, 2024

AeroCoupe said:
You can use the C3W ECU with a manual transmission as long as you use a manual trans O2 harness or rewire the auto trans O2 harness for a manual trans.

Actually, he can use the C3W as long as he doens't change any wiring and leaves it configured for the AOD ecu.

If he swapped to the A9L, he would need to repin the O2 sensor harness foe a 93 manual car, and swap to the manual trans harness (or just add the two NGS wires and tap into wiring in the driver's kick panel). That last harness is debatable in terms of how necessary it really is.

t1_5.0 · May 15, 2024

Mustang5L5 said:
Actually, he can use the C3W as long as he doens't change any wiring and leaves it configured for the AOD ecu.

If he swapped to the A9L, he would need to repin the O2 sensor harness foe a 93 manual car, and swap to the manual trans harness (or just add the two NGS wires and tap into wiring in the driver's kick panel). That last harness is debatable in terms of how necessary it really is.

Okay cool, so as long as I keep the automatic O2 sensor harness I shouldn’t have to swap the ECU.

Mustang5L5 · May 15, 2024

t1_5.0 said:
Okay cool, so as long as I keep the automatic O2 sensor harness I shouldn’t have to swap the ECU.

If the car is driving fine as is, don't change a thing.

Lets say the ECU fails down the road and you get your hands on a good A9L. That's when you need to pay attention to a few things.

AeroCoupe · May 15, 2024

For some reason I have had that in my head wrong for a few years then. Good to know for sure.

KRUISR · May 16, 2024

I think all I did was put a jumper in the trans harness because my trans didn't have a neutral safety switch. Otherwise left everything else alone.

90sickfox · May 16, 2024

AeroCoupe said:
1988 MANUAL 8LD
1988 AUTO 8LF
1989 MANUAL A9L, A9S
1989 AUTO A9P, A9T
1990-92 MANUAL A9L
1990-92 AUTO A9P
1993 MANUAL A3M
1993 AUTO C3W
1993 COBRA X3Z

You can use the C3W ECU with a manual transmission as long as you use a manual trans O2 harness or rewire the auto trans O2 harness for a manual trans.

Good thread on it here:

Drivetrain - Can I Use A9p Ecu With A T5 Manual Trans

Doing a t5 swap in a 93 notch. Did a 5.0 swap on this car and used a AOD. Now I am collecting parts to do a t5 swap and I thought I read a while back you can use a a9p ecu on a 5 speed. I can pick up a a9l local for $75.00. Would it make sense to just change out the a9p to the a9l, what all is...

stangnet.com

You left out the 89 manual convertible A9M. It's a weird one that comes up every once and a while.

t1_5.0 · May 22, 2024

Mustang5L5 said:
If the car is driving fine as is, don't change a thing.

Lets say the ECU fails down the road and you get your hands on a good A9L. That's when you need to pay attention to a few things.

Sounds good! Thank you

Progress Thread C3W… A9L… A9P?

t1_5.0

Member

AeroCoupe

lube between the nut and the face. I know my lubes

Drivetrain - Can I Use A9p Ecu With A T5 Manual Trans

Mustang5L5

That is…until I whipped out my Bissell

t1_5.0

Member

Mustang5L5

That is…until I whipped out my Bissell

AeroCoupe

lube between the nut and the face. I know my lubes

KRUISR

90sickfox

Wasn't a pretty sight...and I've got big hands

Drivetrain - Can I Use A9p Ecu With A T5 Manual Trans

t1_5.0

Member

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Progress Thread C3W… A9L… A9P?

Member

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

Member

That is…until I whipped out my Bissell

lube between the nut and the face. I know my lubes

Wasn't a pretty sight...and I've got big hands

Member

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