I swapped in a s4 TII engine into my s4 n/a with all of the emissions removed. I set the TPS to 1KΩ and adjusted the idle screw on the throttle body to 750rpm. The car starts up just fine and will idle for about ten seconds then jump to 1200 rpms then die. I can start the car back up and the same thing will happen. My question is mainly how can I fix this? It would be nice to get the thing to idle but I may have to reinstall the bac valve. Where could I find the diagram for it?


Thanks

 

Bump. I know where the coolant lines for the bac valve run but I dont know where the air hose goes to from the bac valve. If there is a diagram that shows the routing of the bac valve that would be awsome.

 

It connects to the back of the stock bypass valve pipe. Just making sure in case you didnt know that coolant does not actually flow through the BAC.