I am in the middle of a engine swap on a 12 valve afc engine on my 96 a4 2.8. We have the new engine in and we are getting ready to put the intake on. I have one plug i cant seem to figure out where it goes. In the picture it is the white plug beside the blue on on the left of the finger pointing. This set of plugs is on the drivers side of the firewall.

 

I have the top section you can see in the picture but i cant seem to locate the bottom piece that it connects to. Does anyone know what this connects to or where it runs once it leaves the firewall. This engine swap has been some what of a nightmare lol

 

Ill look at mine afterwork before she goes to the scrap yard and see if i can help

 

Thanks it's the last plug and I can't seem to find out where it goes. On my parts car it is cut.

 

The top half should come from the ECU and the bottom section snakes under the intake manifold and goes to the ignition coil pack. The other harness from the coil pack goes to the icm on the airbox.
Good luck with your engine swap.
Just out of curiosity, what took out your old 12v? Mines got 240k and still runs pretty good.

 

My 12V '96 is going on 248K and runs great too. It used 1 qt of 0W-40 in 3,000 miles since the last oil change, and that's with about 30 minutes of 80 mph cruising every day.

 

Headgasket went on her and just did timing service 20k ago and no i didnt over heat it was driving and on way to work just hit her hard barely made it rest of way to work stalling out sounding like a diesel from misfire on the leaking cylinder

 

Bad luck. That motor is known to leak oil externally from the head gaskets, but they rarely blow and loose compression.