Quote:
Originally Posted by geoffreymbrown
How interchangeable are the ECU's for the M103 300E's ? Looks like mine is failing and I need to find another, but I'm not sure whether I need to look for an exact match or if there is a degree of interchangeability.
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To answer the original question - that of interchangeability - look through the FSM to see the variations of the same theme.
Around 1988 and 1989 (if I remember correctly) the sensors and wiring changed a little bit. So I wouldn't get anything from 1988 onwards it is unlikely to be a plug and play solution.
The addition of a sensor on the back of the speedometer (road speed sensor) was something that happened towards the end of the CIS engines: If your car was newer I'd say that that might be worth checking but I don't think it was fitted to 1986 models. (Still thumb through the FSM and check)
So long story short - if you really want to swap ECUs it is probably best you get the same Bosch part number - this would limit the cocking about