Set welder for about 100 amps, press peddle fully & see if machine makes a hissing noise ?
Was trying to find reason for porosity all of a sudden.
Was adjusting gas flow & noticed this hissing noise, thought may be a leaking hose, so took side cover off.
Hose is fine, noise that sounds like a leak is coming from the center area of machine.
This may be a normal noise , but just was not noticed before.
Welder worked fine a couple days before, now all welds are full of porosity.
Still have 500psi of gas ?
Just dont know what problem is.