Hey everyone, I have an experiment for us to try. For those of us that have the cold start valve clatter, I have discovered something interesting. If the truck is parked at say a 10 degree or even less incline (nose up), and it is started, the clatter, at least for me is very slight or mostly not at all. I would like for those who have this prob to give it a try (if where & how you park permits SAFELY) (should use the parking brake too!) & see what your results are. For some reason it works for me!