ok ive been reading through posts and i keep seeing BAC valve... can somone tell me what it is?

 

A variable intake leak that adjusts itself according to engine load.

Nice sig...

 

You have an FD. You don't have one...

 

Don't let the name confuse you...he has an FC from what I remember...

The Bypass Air Control Valve is mounted to the throttle body on the driver's side and has a two conductor plug going to it (green) and two ~3/8" coolant hoses (one front & rear) to keep the solenoid at a constant temperature (per FSM). It is a linear pulse solenoid that varies the air bypass opening to account for engine load (i.e. power steering, A/C, hot start up idle up, etc.)

On the other hand, the Air Bypass Solenoid is different, and mounted to the right and when on takes the RPM's to 3000 at start up under certain temps. (and in neutral).

 

It wasn't the name that confused me, it was the fact that his profile says he has an FD, he quoted info from the FD FSM in another thread, and he hasn't once mentioned what car he actually has. And people wonder why they don't get help...

 

fc... 91 s5... YAY!!!

and thanks to all those who gave me info