I am in the middle of fitting a Ford Zetec engine into a Ka.

The engine will not start with the Focus ECU in it but will start with the Ka ECU, so I was wondering if I could keep the KA ECU and get a chip or something to change the fuelling, etc.

I think it is something to do with PATS.

Is there anyway to disable this?

The engine turns over with the Focus ECU but doesnt start.