car not tickin over after engine swap

[gazcuprablk]

i have changed the engine on my cupra as it was easier than takin the old 1 out but now i have done this it will start and run for 2secs then cut out i have removed the charcoal filter and secondry air pump and the car is fitted with a scorpion alarm it seems as though the imobiliser is kickin in but any other ideas why would be helpfull and the car has the same ecu before the engine swap.

 

[pj1985]

You probably need to code/recode the ecu to the car with vag com. Theres a guide in the swapping ecus thread in the vag com or tech section. Just search for it.

 

[gazcuprablk]

the ecu is the same 1 that was in there b4 i swapped the engine would i need 2 re-code it? or could it be the alarm that was fitted to the car?

 

[pj1985]

Try recoding it first.

 

[m0rk]

if the ECU & clocks haven't changed, I'd say it'll be a missed connection

aftermarket alarms are fickle, but then if you've not touched that why would it fail