GumpyJoeWV

They sent me another truck. It's identical to the other Mack. It has the same problem. I don't sleep in the truck. My problem is happening while driving. I crack a window and the fumes get intense. I'm going to try adding an elbow to the tailpipe and then run it out the side. If that doesn't work, I'll get the boss to put a stack on it or send me something else. I love the Mack though. Very comfortable. I'll keep y'all posted.

I've had the exhaust checked from front to back. No soot or smoke anywhere. I read on the net that having an underneath exhaust and a window open is possibly the problem. Not sure how difficult or expensive it'd be to put a stack on it, but I'm gonna run it by the boss. Thanks for the replies guys.

Hey folks. I just started driving an '07 Vision. It has serious exhaust fumes in the cab when the window is cracked. I suppose it's coming from the underneath the sleeper muffler. I found that some of it was coming thru the floor around the shifter boot. I put the boot back like it should be but I'm still getting major fumes. I've had the truck in the shop twice and no leaks were found in the system. Is this a common problem? Where else could the fumes be coming in? Please help. Thanks