2010 Western Star 4900

My 2010 Western Star with a DD15 is acting up when warmed up, I changed the fuel filter and still runs better when the engine is cold. When the engine warms up and I am at a light and start giving it fuel to go it falls dead on it’s face, I have to try to rev the engine up and then it will move. Also when I do it will send grayish black smoke out then it runs fine. Going down the highway it runs great I hate to stop because I know it will act up again. Any ideas?

 

I didn’t even think to check for air leaks. I will inspect it and let you know. Thanks!

 

I said I would get back about this, well I don’t think that was the problem. No bubbles in the tanks no fuel leaks nothing. The problem is still there.

 

The problem is low oil pressure at a stop. I took the truck to Detroit Diesel, they did a full diagnostic test on the engine and determined to be seals wearing out and need to be replaced underneath the engine. They have to remove the oil pan to replace the seals.