I figured out over the weekend that the BAC on my '90 Vert isn't getting any voltage applied to it. If I test the plug, it reads 0 volts whether the A/C is on or not.

So, first I tested the BAC itself. It opens and closes just fine, then tested the Air Bypass Solenoid and it tested fine, then tested the Air Bypass Relay and it tested fine. So the only thing left that I can think of is that something is wrong in the ECU itself.

Anybody know how I would go about testing that? And lets say the ECU is bad on that lead, anybody know what to replace on the circuit board?

 

you should also check the continuity from the bac to the ecu. it should also have set a code

mike

 

Boostd,

Try this:

https://www.rx7club.com/forum/showth...threadid=79636

B

 

http://www.teamfc3s.org/info/articles/idle.html Down near the bottom is an item about the BAC. The link in the post above this seems to be what you need also.

 

Thanks for the linkage ...