VT LS1 Stalling straight after ignition???

[VT5.7L]

Hey there
i have recently swapped my vt ls1 for a vu ute ls1, now my my vt stalls after half a second everytime after ignition.

What could be causing this?

ive been told the computers are interchangable
as far as im aware the wireing is complete

New motor + Boltons
old trans,
old ignition packs

the one thing i know isnt hooked up is a small hose going down to the trans on the right hand side. (vaccum hose i believe)
could this be causeing it to stall?
if not what else?

Thanks for the help, cars been off the road for a bit now, is mad shitty =[ want her going again...

 

[accentstencil]

I'm not sure of what you are saying but if you have swapped the computer (ECU) it won't start without being linked to the BCM.

 

[VT5.7L]

Thanks for the response
i havent changed the ecu/computer, i have been told i didnt need to from vt to vu. just wasnt sure if taht was true or not...

Well to word it better,
vt ls1 = dead. i put in a vu ls1 now stalls.
every part of the car besides the motor and boltons are from the vt

Just need to find out possible solutions =] cheers

 

[frankenstein]

my cousons wh stato did this and it turned out to be 1 i wire with a rusty clip im not sure where it was how ever. also my wh did this when i did the gen 3 conversion i needed to send it in and have the ecu and bcm matched

 

[VT5.7L]

when putting in the motor, all the wires looked clean.
i will check for error codes in the morning, hoping its a cheap fix, has already cost me near 2000 =[
how much did it cost to do that?
thanks mate

 

[accentstencil]

The engine will run for about half a second if the immobiliser isn't off. Is the security light in the mode switch flashing when you try to start it.

 

[VT5.7L]

yea the light is flashing, its an after market immobilzer, but i didnt swap the computer or key or anything, would it still affect it? and not sure if it matters but the stalling time varies, can stall straight away or after a second

 

[CHEETR]

sounds like something to do with your imobiliser.. you must have touched a wire or knocked it somewhere

 

[VTS5]

yea the light is flashing, its an after market immobilzer, but i didnt swap the computer or key or anything, would it still affect it? and not sure if it matters but the stalling time varies, can stall straight away or after a second

So,immobiliser's light is flashing,meaning,its armed and you trying to fire it up ???? Brilliant...The answer to your problem is flashing at you...

 

[VT5.7L]

may seem like a stupid question,
but how do i unarm it? normally if its alarmed and you open the door wouldnt it go off?
i was never given a key to the immobilser, are they easy to remove?