I have a 04 3500 dully w/cummins I am getting a excessive amount of soot on my quarter rear panel im wandering if this is normal or am I running lean I thought about adding a exhaust tip?
Any suggestions I have 8500 miles so it should be broke in.


Ed Cloud

 

This is a very common problem. I think it is just the location of the end of the exhaust pipe, and the air flow over the body.

I put a Megs tip from Gino's on mine, which improved but did not quite solve the problem. I could probably scoot the tip out a bit, but what soot gets on the bumper now is so minimal that I haven't bothered.

There are some turndown tips out there that I'm sure would also totally cure the problem, but I went with the Megs for the clean look of no clamp... A turndown would probably look better on the dually than my srw.

 

That just means it's time to invest in some nice chrome 4" stacks! Diesels don't run lean. Unlike gas engines, diesels can run on a wide spectrum of air/fuel mixtures. Gassers need more air to produce more power first...diesels just need more fuel first, and then the air is in second place. So, the harder you step on the throttle, the more fuel that's injected. If you turbo isn't spooled up fast enough to supply the air all that fuel you just injected into the cylinder needs to burn it all, THAT'S when you get soot...from the unburned fuel.

 

Learn to love it because its a never ending battle. Just wait till you start bombing