My first time here and I am in need of some help. My stock LLY will occasionly push out tons of but black smoke and will not move more then 5 mph when starting out from a dead stop. The only code the dealer can ever find is P0101 but no failure code. The check engine light has never come on. Does it when towing. Mileage has been going down. New air filter and fuel filter. Getting the deer in headlight look from the dealer. Has anyone ever had this happen to them or heard of it? Thanks for helping.

 

What all have you done to the truck??

 

sounds like a failing turbo

 

welcome to diesel bombers bet it wont take to long to get some input on your problem go to search at top of page and put in 05 duramax smoking problem it will take you to a site look on duramax lly turbo problem see if that helps with your problem

 

Try cleaning the Mass Air Flow sensor. It's the sensor on top of the intake tube, just past the airbox. Unscrew it, pull it out and squirt some carb cleaner or electrical cleaner on it to remove any debris. Let it dry then reinstall. See if that helps. It sounds very intermitant and with no real codes it will just make it diffecult.

Any mods to your truck?

 

usually if a MAF sensor has a problem it would come up with a code, Bank 1 and Bank 2 system too lean.

 

No mods to the truck. Totally stock. Has new air stock air filter and fuel filter. Has been to the dealer 5 times. Never a hard failure code just a soft code of P0101. They do not thing it is the MAF sensor but then they do not have a clue. Engine warranty expires this month so I have been trying to force their hand. 62k on the truck. Just frustrating because it is intermittent. Thanks for the input.

 

As long as you have started the issue with the dealer, they should warranty the issue even after the warranty runs out. Just do not let them close the warranty ticket on the issue.

On another note, remove the intake and check to see if it has something in it. I would also check to see if the intercooler is free flowing internally. If you purchased the truck second hand, one of the intercooler tubes may have been off and something found its way into the intercooler and causing blockage.

I know it sounds strange, but strange things happen. Read somewhere that there was a similar issue with a lly and the owner had stuck a rag in the intake while doing work. Long story short, the owner forgot to remove the rag and it was causing intake air restrictions.

 

p0101 is a MAF code. try cleaning it just for ha ha's and check the air system.

 

Welcome to yesterday morning DDB

And the MAF can nut up and not set any codes. Intermitant problems may not set a code, that's when you have to go back to good old fashioned diagnosing: watching data, snap shots, test, etc. It could be something like an incorrect turbo vein position too. It's possible that it's not bad enough to set a code, but off enough to cause a drivability problem. Don't know without looking at it. In your case johndeeresforever, the easiest thing to do is start small and work your way up or if possible try another dealer.

Do you hear any exhaust leaks or 'odd' sounds?