Bought one of these and didn't see any smoke at 1psi. Replaced the pressure regulator with a air hose barb then regulated the pressure with the compressor. The paint can lid will blow off around 7psi. Dialed it back to 5 psi and found my IACV leaking around the throttle adjustment screw. Been trying to find that rear leak for quite a while now, happy to finally find it.