I Thought I'd do a little guide on the N249 bypass for the AMK and BAM engine which is different (and more simple) than the bypass on other engine codes.
The AMK/BAM engines dont have an N112 valve, which means there's no need to cut and t-piece anything. It's as simple as putting silicon vacuum hose from the DV to the inlet.
All that's needed is some 4mm internal diameter vacuum hose and new hose clips. I bought 2 meters on eBay for about 4 quid all in.
So remove engine cover to expose the mess that is this:
Vac chamber and N249 spaghetti junction...
This is what we will be removing:
So undo the bolts which attach the vac chamber to the metal bracket and release the valve from the catch.
Follow the pipe to the dump valve and disconnect:
Now remove the plastic cover down near the dipstick which is secured with 2 Phillips screws.
This reveals a metal plate underneath which is removed with 2 Allen key bolts.
Follow the vac pipe from the N249 down to the inlet and disconnect. This can be found on the left of the inlet manifold on the underside:
Dont forget to disconnect the electrical valve. Once disconnected pull out and keep aside:
Once out the car, disconnect the piping to salvage the valve:
Despite bypassing this valve, we still need to keep it electrically connect otherwise the ecu will throw up an error code.
I re connected the valve and tucked it away behind some heat proof to hide it.
Now disconnect the metal bracket which is bolted to the cam cover
The bay should now look like this (ignore the fact my coils are out, I changed my plugs whilst I was at it)
Now all that's left is to connect the dump valve to the inlet with the 4mm Vac hose. I used small cable ties to run the hose the route I wanted:
And that's it! Re assemble the bracket near the inlet and the plastic cover and it should look like this:
Since doing this my DV seems a bit more responsive, makes a slightly different noise and keeps the bay nice and neat!
Hopefully this will help some fellow AMK/BAM owners as this was a lot easier than first thought.