(PLEASE HELP) 1996 Golf GTI VR6 AAA, crank, no start.

Jumping in on this post again. I'm also going from OBD2 to OBD1. I've got a mk2 vr6 which has been running an OBD2 setup for years now. I've come across a OBD1 95 mk3 VR with low miles on it so have poached the engine to go into the mk2. Both cars ran fine before, however I've just put the OBD1 motor into the mk2 and I'm not getting any fuel at all. The ECUs have been swapped but all other wiring kept the same and everything marries up fine. The ECU relay has also been changed. Am I missing anything for this conversion to work? Want to know before I start diving into fault finding

 

So if I go for the preferred option (swapping my old engine parts over) will this be the entire engine loom and sensors along with the obvious stuff like the inlet manifold? I assume that the fact the plugs are all the same the sensors themselves differ? Thanks for the response btw

 

Correct, engine bay loom and car is OBD2 engine harness is OBD1 as is the ECU. Today I'm going to transfer the engine loom, all engine sensors and the manifold across to the new engine from the old one and try and fire her up.