HI everyone, I'm new on this site and wanted to take your opinions and help regarding to my problem. I have a 2008 cx7 turbo with a 150K mileage on it. I did it the fist time changing my chain, vvt and its component and works fine but my second time it gave me a problem that when it starts it blows black smoke on the tail and will not rev up. Checked the timing, check the hoses for air leak but still doing the same. The only last thing I have to check is the cylinder pressure test. By the way it has a fault code P050B and P2138. Any opinion or help will be much appreciated.