Hissing vr6

[bmotormad]

Hi all,
Just put a vr6 in my mk3 cabrio. went fine until i tried to run it !!!
when ignition was switched on the fuel pressure regulator was whistling dixie, luckily i just happen to have another vr6 so swapped it over and now it sounds like its venting somewhere else.
It will turn over and fire but then dies, leave it a few seconds and it will do the same.
any help would be great as im out of idea's
Thanks

Been doing more research and it seems the ecu has an immobiliser !!!

[Diamond Hell]

Sounds like an immobiliser fault.

Or if the fuel pump is running the whole time it's possible you've not earthed the ECU correctly and blown that.

[bmotormad]

pump is running all the time but wires were all in before i attempted to start.

[F17BAD]

ECU does not have immobiliser like on MK4s but you need transponder and chip from donor car .. just incase u not done that

[bmotormad]

thought i swapped everythin over, what does it look like ?

[Peej1981]

The transponder and chip are built into the key, did not not get a set of keys with the doner car?

[bmotormad]

havent swapped the barrel  :embarassed:

[topher]

no need to swap the whole barrel you can just take the immo pickup ring off the donor... which plugs into the immo box behind the dash which i reallllly hope you haven't sent to the scrapyard!

[Peej1981]

no need to swap the whole barrel you can just take the immo pickup ring off the donor... which plugs into the immo box behind the dash which i reallllly hope you haven't sent to the scrapyard!

As topher said and lets hope you havnt scarped the doner car 

[bmotormad]

nope still in my scrap yard aka the front garden!!!
so is it the brown ring that plugs into the brown box? i suppose that means i will have to pull the dash out