When I got my marquis it smoked like a HEAD GASKET WAS OUT. But, no over heating or water in oil or vice versa. So I bought a complete gasket kit and changed all gaskets from heads to upper intake and throttle body. All but main seals and oil pan. then when I was finished it was still doing the same thing. Still to this day. After it warms up and my rpm's are climbing like on an incline to maintain its speed it will start to smoke. It leaks on the driver side on to the exhaust manifold but it is also on the brake cylinder and every thing else like it is spraying in a mist. I thought it might have been the space in the back of the intake for the pcv valve because I had it out for a while cause I couldn't figure out where it went because Haynes manuals suck and are extremely vague at times. but I figured it out and it is still doing it any ideas, anyone else had a problem like this with a 5.0. Willing to listen thanks!!!!

 

have you changed the grommet that the PCV valve sits in? If it's leaking like that, it's a good indication that the grommet is bad/cracked. You may also have some real oil paths clogged allowing oil to build up in the rear of the engine when on inclines. I've heard good things about autoRX from a friend of mine (it's a bit of a process, but it seems to work great).

 

Yeah I changed the grommet. what do you mean real oil path? Also how does Auto RX work and what is it.

 

I meant to type rear oil paths. The drain tubes through the heads and block. AutoRX is a cleaner of sorts. http://www.auto-rx.com/
You can also try stuff like seafoam that you can get almost anywhere.