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Old 12-25-2008, 10:53 PM   #1 (permalink)
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Default ECU and TCU question

I'm gonna go snag an automatic 1991 blue stealth with the TCU nad ECU missing within the next couple of days.

Will the ECU and TCU from any 1st gen work?
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Old 12-26-2008, 12:11 AM   #2 (permalink)
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Default Re: ECU and TCU question

ECU and TCU both beat Boise St in bowl games the last two years
Sorry wrong area.
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Old 12-26-2008, 12:17 AM   #3 (permalink)
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Default Re: ECU and TCU question

Quote:
Originally Posted by 3kgt1734 View Post
I'm gonna go snag an automatic 1991 blue stealth with the TCU nad ECU missing within the next couple of days.

Will the ECU and TCU from any 1st gen work?
yea, double check the part numbers
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Old 12-26-2008, 06:56 AM   #4 (permalink)
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Default Re: ECU and TCU question

Quote:
Originally Posted by 3kgt1734 View Post
I'm gonna go snag an automatic 1991 blue stealth with the TCU nad ECU missing within the next couple of days.

Will the ECU and TCU from any 1st gen work?
The ecu from any 1st gen will work as long as the number of OHC's match. You want DOHC for DOHC and SOHC for SOHC. The TCU's should also work as long as it is a first gen and the tranny types match. Check the part numbers as stated.
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Old 12-26-2008, 10:53 AM   #5 (permalink)
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Default Re: ECU and TCU question

do all first gens use the same part number?
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Old 12-26-2008, 10:59 AM   #6 (permalink)
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Default Re: ECU and TCU question

I'd have to check CAPS for you later.
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Old 12-26-2008, 11:21 AM   #7 (permalink)
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Default Re: ECU and TCU question

Quote:
do all first gens use the same part number?
For the ECU? No.
From ECU Part Numbers...JOHN MONNIN'S PERSONAL 3000GT/STEALTH FAQ
(Thank John Monnin)
ECU Part Numbers for FWD DOHC Federal emmisions ONLY
9004.1 – 9205.3 : MD159963
9206.1 – 9305.3 : MD190662

Right now I'm running the ECU from a '93 Stealth ES in a '92ES.
Although the car seems to run just fine there is a bit of nagging weirdness that MIGHT be because the ECUs were different. For one thing the exhaust has a bit of a bassey rumble that reminds me of when the dealer screwed up my timing belt. Keep in mind that the cam and crank sensors were changed in '93, so there could be some subtle change in the ignition timing. This is a recent acquisition, and I haven't caught up on all the maintenance yet so it could be something else entirely but at this point all I can say is that it will work in a pinch but unless someone knows for sure I can't say that I'm 100% certain that the two ECUs are completely interchangeable.
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Old 12-26-2008, 11:27 AM   #8 (permalink)
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Default Re: ECU and TCU question

so to clearify, I can get an ECU from any first gen stealth/3000gt NA DOHC and it will work on a 1991 Stealth ES DOHC?

And as for the TCU just get one from an automatic?
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Old 12-26-2008, 11:50 AM   #9 (permalink)
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Default Re: ECU and TCU question

To clarify my clarification..
the ECU for model year '93 (built between June of '92 and May of '93).
is different from model years '91 and 92 (built between April of '90 and May of '92).
I can say from first hand experience that a '92 will start and run with the '93 ECU, but I cannot say that it is completely glitch free. Maybe they are, maybe they're not, I still have some cleaning up to do before I can say for sure.

Quote:
And as for the TCU just get one from an automatic?
The TCU is only used on automatics, you have no choice on that one.
I don't have a list for that but if you snag the VIN number we can look up the correct part number for you.
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Old 12-26-2008, 12:20 PM   #10 (permalink)
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Default Re: ECU and TCU question

Quote:
Originally Posted by Steve '93ES View Post
For the ECU? No.
From ECU Part Numbers...JOHN MONNIN'S PERSONAL 3000GT/STEALTH FAQ
(Thank John Monnin)
ECU Part Numbers for FWD DOHC Federal emmisions ONLY
9004.1 – 9205.3 : MD159963
9206.1 – 9305.3 : MD190662

Right now I'm running the ECU from a '93 Stealth ES in a '92ES.
Although the car seems to run just fine there is a bit of nagging weirdness that MIGHT be because the ECUs were different. For one thing the exhaust has a bit of a bassey rumble that reminds me of when the dealer screwed up my timing belt. Keep in mind that the cam and crank sensors were changed in '93, so there could be some subtle change in the ignition timing. This is a recent acquisition, and I haven't caught up on all the maintenance yet so it could be something else entirely but at this point all I can say is that it will work in a pinch but unless someone knows for sure I can't say that I'm 100% certain that the two ECUs are completely interchangeable.
Meh...all 1st gen ECU's will work in all first gen cars of the same model. I.E. a 93 ECU will work in a 91/92 and vice versa. How do I know it works? I've tried it..multiple times on multiple cars.. See Sig.

TCU's are similar..you want to stick to the same generation/year as the ECU. There are slight differences in the tcu after 92/93 iirc. Maybe Brian can clarify on that though. I remember the pita it was to hunt for a TCU for my stealth and my 93 VR4 because of matching the years up. I'd fine mismatch generations/years all the time, but never anything I could use.
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