As I said before, I wanted to try the earlier ECU to see if it'd make the car any quicker..... it didn't. But I left it in to see if it would solve this high idle problem and unbelievably it has so far. It's been in since Sat. and I haven't had a visit from the high idle monster yet. It could be that the weather has turned colder or just plugging and unplugging the ECUs restored a good connection, who knows. So I'm leaving this ECU in there for a while and I'll report back again in about a month or so.

To anyone thinking of doing some ECU swapping of their own amongst M-103 W-124s, I would advise you to keep the 86-89s in one group and the 90-93s in the other group and don't cross those groups.

BTW, the car's best E/T of the day was a 16.969 @ 82.49 MPH uncorrected which is about a half second slower than it ought to be but what do we expect from a 21 year old car with 231,000 plus miles? I'm gonna try to tweak the EHA though.
Regards, Eric

__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.