djkaosone to the Courtesy Phone - Oil Catch Cans

[powershift]

Blowby that feeds oil directly back into your intake manifold and intake valves causing carbon build up.

Ah, yeah now that I think about it a lot of the C5/C6 guys ran them, but I didn't hear about the carbon build up. I was taught that if I run it hard then it cleans the carbon out lol. There was some build-up on the back of my valves when I first got it at 97k mi, but that isn't a big deal to me. If the valve doesn't shut then that's a problem, but high RPM's up a long grade in command mode is what mine likes now. Its a lot like exercise and it needs a workout. In fact, the owners manual says to run the AC once a week. Use it or lose it.

 

[scapistron]

It is a sad known problem with direct injection engines. I'd love to see a manufacturer employ a port fuel injector that supplies roughly 25% of the fuel demand to keep everything nice and clean.