sorry mods ive posted this under general before i seen this section, delete other if neccessary, cheers.

anyways,

I've just fitted another 1.8D engine into my escort van (like for like engine wise) but now the immobiliser seems to be kicking in and stopping it from even cranking. ive still got the full donor van so any bits can be taken out and used in mine.
ayone experienced this before or know how to solve it?