4.5l Allante engine (Page 4/6)
olejoedad OCT 17, 12:30 AM
The BCM isnt a big deal, the engine/trans dont need it.
You will need to have the MEMCAL in the ECU reprogrammed.
Pauljt OCT 18, 02:25 PM
Ran into a bit of a snag with the ecm . Talked to Ryan at Sinister and gave him my numbers. Serv #1227750 and chip ADBC 6501. Apparently these numbers are from a 1987 4.1l Allante. Doesn't make sense to me. It was included with the engine, tranny and wiring I got from the previous owner. Anyone know what should be the numbers for a 91 Allante?
Pauljt OCT 18, 08:34 PM
Never mind. I found and verified the 1991 numbers. (2240). I'm beginning to get a real bad feeling about the engine and tranny I bought. Are there any physical differences between the 4.1 and 4.5 Allante engines? I have various numbers from the engine but can't seem to find out how to interpret them.
Johns 4.9 OCT 18, 11:08 PM
Pauljt,
What are the part numbers on the heads and the part number on the lower intake manifold? I can tell from those number which engine it is.
Cheers,
John
Pauljt OCT 19, 10:36 AM
Head....645820. Intake....1645791. Block casting (I think).....1648452 cfd-1.
Pauljt OCT 20, 07:14 PM
Ok. I have verified those numbers as belonging to the 90-92 family of 4.5l Allantes. I have no idea why there is a discrepancy in the ecm numbers. I've spoken to the gentleman that removed it all and he verifies that it all came out of the same 91 Allante.
Spadesluck OCT 20, 07:47 PM
Could be the manufacturer just reused some stuff or it was replaced at some point with the wrong one.
Pauljt OCT 20, 09:29 PM

quote
Originally posted by Spadesluck:

Could be the manufacturer just reused some stuff or it was replaced at some point with the wrong one.



Could be. And it may have worked fine in the 91 Allante, but the problem is that when I checked with Ryan at Sinister he could do nothing with that ecm as far as re-programming goes. Which leaves me doing more research ,I guess, to see if another ecm might work in my 4.5 Fiero swap.
Raydar OCT 20, 09:56 PM

quote
Originally posted by Pauljt:

Could be. And it may have worked fine in the 91 Allante, but the problem is that when I checked with Ryan at Sinister he could do nothing with that ecm as far as re-programming goes. Which leaves me doing more research ,I guess, to see if another ecm might work in my 4.5 Fiero swap.



The 2240 was used in the Allante, as well as the 4.9 Devilles and etc. They are pretty common and not absurdly expensive. (At least mine wasn't.)
You should be able to start with the base Allante PROM, and run with it, from there.
If you need a copy of the stock Allante tune, for the 2240, please let me know. (Ryan probably already has it, however.)

Edit - the 1227750 is all over the internet as a replacement ECM for the Allante, including the later years, like yours. There is a good possibility that it is a Service Replacement part for the 2240.

Check this out. These are all the Cadillac definition files available for the Caddy 4.5 and 4.9, from Tunercat.
It does not list yours, but that doesn't surprise me. These files are just about always a work in progress, as they discover new combinations.

PROGRAM ID - ECM P/N - PLATFORM

CD1 - 16132240 - 90 Cadillac LW2, 4.5L, V8 (ATTL) 91 - 92 Allante LQ6 4.5L V8 (AUMF)

NS1 - 16132240 - 91 - 93 Cadillac L26, 4.9L, V8 (BWYA, BWYH, BWYJ, BWYN, BWXZ, BWYY, BWXX)

NS2 - 16132240 - 91 Cadillac L26, 4.9L, V8 (AYFD, AYFP)

NS3 - 16132240 or 16123860 - 91 -93 Cadillac L26, 4.9L, V8 (AZXF, BBWZ, BBXD, BBXF, BBXL)

NS4 - 16132240 - 91 - 92 Cadillac L26, 4.9L, V8 (AZPW, AZCP)

NS5 - 16196347 - 94 Cadillac L26, 4.9L, V8, Manual*** (BWYZ)

NS6 - 16196347 - 91 Cadillac L26, 4.9L, V8 (ATCX)

***This definition file lists "manual", but I believe that is an error. I looked at the PROM info, and there is no manual option. Not sure what that's about.

[This message has been edited by Raydar (edited 10-20-2019).]

Pauljt OCT 20, 10:34 PM
Thanks much for the info. The ECM serv number 1227750 is only part of the problem I have. Although I'm glad to hear it's being used in later year applications. The chip in the darn thing is ADBC 6501. Which apparently is from an 87 4.1 Allante. Ryan says he can't do anything with this or any other 4.1. Not sure if that means it can't be done or just that he doesn't do it.