T25 camper with Golf mk3 AHU engine, project.

Bought a unfinished T25 (T3) with AHU Tdi fitted but not running.
Found previous owner had just bolted the engine to original gearbox/clutch so after thinking was seized due to standing was relieved to find was just interferance between bellhousing and pressure plate.

Now after buying correct diesel T25 flywheel and clutch have engine turning over, fitted wiring harness after pruning it down to engine only stuff but although had immobiliser deleated didnt start (bled filter using small pump to suck from container until diesel flowed out of return pipe), checked and didnt have 12v at fuel shut off valve, wire fed from ecu on pin 53 and continuity fine from socket to valve so think ecu (ecm) is faulty, have ordered another via E-Bay so when get it will try again (told even without immobiliser disabled should still start but will cut out after couple of seconds)

Hopefully on latter stages of project (engine running wise at least)

Peter.

Have fitted a good used ecu and have got engine to fire but as immobiliser isnt bypassed on it yet it only runs for couple of seconds so early days but at least looks promising.

The used ecu i got was from a Audi A4, same 68 pin layout as the Golf mk3 one but had plastic blocks in top corners that stopped plug going in (removed with soldering iron)
Had read that all 1.9 68 pin ecu's were compatable, it started and only code given was for immobiliser so are there any differences??