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84 Eldorado, need original ECU#

Started by Rushdie, February 21, 2014, 04:49:56 AM

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Rushdie

Hi
I'm working on a -84 Eldorado that got a broken ECU. The calpak is busted (non removable) and when I connect it to a computer I can see that it's doing all kinds of funky stuff. It's constantly messing around with pretty much every actuator (IAC, AIR, cruise etc) it can. Sounds like a zoo under the hood...

The problem: This (broken) ECU isn't the original one. It's from a -85 Eldorado. Now cross checking the ECU# (1226930, DKF)  to some information sheet I found from GM, this ECU were never installed in a -84 Eldorado. The sheet displays like 25 different ECU# for a -84... :(

The car have never, according to the driver, been working as it should. Could be that it have always been running, in his care, with a broken calpak in the ECU.

So I need a new ECU. What ECU# should I choose? Using the ECU# from a -85, that it's atleast runs on... Or does anyone know how to find out what ECU# it actually was shipped with?

Why did Cadillac ship it with like 25 different ECU# for a single year....

76eldo

I could be wrong but I would think that the 84 and 85 ECU would be the same.
Even when you buy a new one the Prom chip gets swapped in from the old one. The Prom chip has the data for the car on it.

You need a used one out of a running parts car with the prom in it and from a car with the same dash type, analog or digital

Brian Rachlin
Huntingdon Valley, Pa
I prefer email's not PM's rachlin@comcast.net

1960 62 Series Conv with Factory Tri Power
1970 DeVille Conv
1970 Eldo
1970 Caribu (?) "The Cadmino"
1973 Eldorado Conv Pace Car
1976 Eldorado Conv
1980 Eldorado H & E Conv
1993 Allante with Hardtop (X2)
2008 DTS
2012 CTS Coupe
2017 XT
1956 Thunderbird
1966 Olds Toronado

Bill Hedge CLC 14424

#2
You might want to check out the post under the "For Sale" forum post entitled "Parts"  See: http://forums.cadillaclasalleclub.org/index.php?topic=129346.0