To get the best signal to my BOV I'm using the vacuum fitting on the plenum where the purge control solenoid connects to the intake manifold. The purge control line is disconnected, but the system is still operational and I've had no CEL's. As I understand it, it only draws evaporation vapors back into the intake from the fuel tank, so it might add a little more fuel into the system. Placing the vacuum line on the #3 runner tap would give a little more fuel to that cylinder as opposed to the plenum which theoretically distributes the fuel vapor equally to each cylinder. Leaving the solenoid open to the air is just dumping that vapor to the atmosphere and shouldn't really cause too much of a concern...or does it? Thoughts, opinions, experiences?
BTW the reason I'm running the BOV off the plenum as opposed to the #3 runner is cause of surge I was getting with the long signal line to the runner. It seems much happier off the plenum.