964russ 0 Posted April 19, 2022 Report Share Posted April 19, 2022 How do I find out which ecu I need? Fitting a vr6 in a mk1, missing the ecu. How do find out which ecu to source? Engine is an obd1 with coil pack, mayb a 1994? I think I need 021 906 258 AF But that's an educated guess. Link to post Share on other sites
Philly-R6 28 Posted April 19, 2022 Report Share Posted April 19, 2022 Some variations of the engine electronics have big differences. For example, some have a six-pin MAF sensor, where later systems have a 4-pin MAF. So there could be loads of incompatibilities if you are to mix and match. If you just have the engine currently, I would recommend getting all the wiring, ECU and sensors from one car. Maybe as late a car as you can - the last of the MK3's was near OBD2 compliant and would fit the engine as-is. You would then get a better/faster ECU, too. You can even get the immobiliser transponder on the key (or have it mapped off at a cost). If you have everything apart from the ECU, your part number seems correct for a 1994 Golf: control unit for fully elec- tronic ignition; lam... - Golf(GO) [EUROPA 1994 year] (7zap.com) Link to post Share on other sites
964russ 0 Posted April 20, 2022 Author Report Share Posted April 20, 2022 Thanks for the reply. No way to id my engine? Might have to as you say, source a full loom and ecu, mayb buy a full car? Didn't really want to go down that route. Seams a waste, won't use any of the car really. Link to post Share on other sites
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