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The ECU is behind the passenger side kick panel in front of the door.
I'm not sure where the ground is, do you have a copy of the Bentley manual? There are a couple grounds on the fuel rail (on the engine) that need to be cleaned periodically.
I'd ID which ECU you have, and look for a spare... not because I'm saying yours is bad, but rather it's just good to have a spare. The '89 and '90 240's usually have the trouble prone pink label -561. The preferred replacement is the white label -561 or -951 ECU.
-Ryan
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Athens, Ohio 1987 245 DL 324k, Dog-hauler 1990 245 DL 142k M47, E-codes, GT Sways/Braces, Dracos, A-cam 1990 744GLE 189K 16-valve 1991 745 GL 304k
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