I've noticed while I'm in low boost, or in very low vacuum, I hear a faint ticking side from the passenger side of the car.
It's not lifter tick, it's not piston slap, I'm not an idiot- I know what that sounds like. But, I've been told the boost solenoid ticks faintly in our cars? I have an 06 WRX TR with 41k miles on it. And I was just curious if that's what the sound probably was.
It only happens between -3 lbs vacuum and 5lbs boost on light throttle. It almost sounds like our loud valvetrain, but I highly doubt I can hear that through the firewall..