PSI sample line leaking caused Mass Calibration to Fail
I don't know if anyone else has had this happen but we had a problem with tuning failing yesterday at the Mass Calibration step. It looked like a gas leak somewhere in the front end, but it turned out that some of our tuning solution was not going through the inner silica portion of the PSI sample line and was instead going between the silica and the outer sleeve intermittently. Once we replaced the PSI line (after 4 hours of chasing a "gas leak") Tuning ran great.