Note for us going from A1-4 to A6 swap

[Bravo-man]

I will try that out tonight.

[reklipz]

I hope reviving a thread isn't taboo, but this notion of the engine holding RPM after I let off of the accelerator is something I'm experiencing as well.

I have a stock F22A1 w/ 5 speed manual transmission (H2A5 I believe; whatever comes stock with a 1991 Accord LX Coupe), and whenever I let up on the accelerator at shift time, the engine will hold RPM for a second or so. When I first got the car, the throttle plate was catching on the inside of the throttle body (causing me to have to give too much throttle to break it loose); I cleaned the TB, adjusted the stop screw so the plate is perfect, and I also properly adjusted the TPS. That thing is a clean as a whistle now, and seems to be in perfect working order. It has always held the RPM after release, however, even before I fixed the sticking plate.

If the ECU is indeed different from an Automatic and a Manual, how can I tell which ECU I have? I have a PT3 in there right now, but how do I know if it's for an automatic or a manual?

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I just took a look on Honda's eStore, and it looks like I found this out on my own. I'm sharing for you all:
The 1991 Accord LX Coupe w/ 5 speed manual transmission comes with:
37820-PT3-A03
37820-PT3-L03

And the 1991 Accord LX Coupe w/ 4 speed automatic transmission comes with:
37820-PT3-A53
37820-PT3-L53 (this part is discontinued when I checked at the time of posting; 6/25/2012)

The ECUs are listed twice each, once for "KA: US Market Spec", and once for "KL: California Spec". That is, the PT3-A03 is listed for both the "KA: US Market Spec" and the "KL: California Spec", as well as the PT3-L03 (and the automatic ECUs as well). I don't know if this is a typo or system error: One might assume that the A in A03 is supposed to be the "KA: US Market Spec" (both have As), and the L in L03 is supposed to be the "KL: California Spec" (both have Ls), which seems logical. But, if one was to trust the eStore, then one would have to conclude that both ECUs are suitable for both markets, like most of the other parts. I'm sure someone on this forum knows, and I am willing to bet that the A03 (and A53) are US Market Spec, and the L03 (and L53) are California Spec, meaning that the eStore is in error listing both as suitable for both.

I don't have access to my car right now to check which ECU I have, but I will post up once I find out tomorrow.

[reklipz]

I just checked; my ECU is part number 37820-PT3-A03, the manual transmission ECU. It's possible someone swapped the circuit board inside, but it's probably very unlikely, so I won't bother checking.