I would seem that all of us could take a snippet from the GM TSB. One of the things it tells the tech to do is test for positive or negative air pressure at the clean side PCV orifice on top the valve cover as a way of determining if the internal PCV is clogged. Take the hose off the valve cover port, start the motor, rev to around 1500 RPM and see if it will hold a small sheet of paper up to the orifice. If so, then the PCV system internally is operating normally. If it won't hold it or pushes away, then the internal PCV is getting clogged or is already fully clogged.
A very simple test that could make someone aware of a problem before it becomes a $4000+ problem. Those that are not so inclined to do this sort of thing, if they take their vehicle into the dealer for oil changes, ask the tech to test the valve cover port for proper PCV flow according to the TSB. Would take only 15 min shop time to do.
Seems this is the only preventive measure available short of tearing things apart regularly and checking the internal orifice directly.
Also, the warranty extension I have seen on this particular issue does not lay out VIN numbers, but years of 2010-2013.... 2010-2014 on the Nox. And the warranty for this issue is extended for 10 years / 120,000 miles. So.... it would seem even a 1L law student could get a resolve on this one.
Freedom is not the ability to do what you want, but the ability to do what you ought.
2006 Cadillac CTS 3.6
2015 Silverado 2500HD 6.0
2017 Equinox 2.4
Last edited by Copperhead; 04-28-2019 at 08:47 AM.