Recently I have been smelling exhaust fumes in the cab of my truck when at a stoplight or parked in the driveway. When driving, the smell tends to go away. This occurs with the windows up and the climate control on auto. I can also smell this when I shut down the truck and exit. Has anyone else come across this situation? I am looking for anything that may be causing this. Hoping not to have to take it to the dealer.

Thanks,
Bryan

 

Put the climate control on recirculate and see if that makes a difference? I catch a faint exhaust smell every once in a while if the wind is just right and I do not have the climate control on recirculate.

 

Bryan,

Sorry to say, but you're probably going to need to get that looked at by the dealer. Off-the-cuff guess, marmon flanges on the up-pipes that feed the turbo, egr feed tube or possibly exhaust manifold sealing at the head. These are high pressure joints, and could allow small amounts of leakage that would correlate with what you're observing. Nothing serious mind you for the most part, but needs to be looked at nonetheless.

-Paul

 

I took my truck in for its first service at the dealer since they had offered the first oil change and urea fill at no charge. I noticed just what you are talking about on the drive home and decided to investigate once I made it in my garage. Low and behold, my oil fill cap was not tightened completely, pretty much just sitting there, and it was emitting a small stream of exhaust under the hood that I believe was getting sucked into the cab. Thanks dealer, I will handle my own oil changes and standard service from now on. (I have to anyways, egr delete). Not saying this is your problem, but worth checking. Good luck.

 

Thanks Paul that I was thinking that it might have something with the connections at the turbo as on my '04 I had to tighten soon after purchase. I will take to the dealer and see what they say this week.

 

Did you sort this out? I just started having the same issue.

 

I have had this problem as well and took it to the dealer today. They could not find a reason. It has gotten so bad that it gives me a headache a couple of times. Im thinking that they left the cap loose but wont admit it, Guess I will wait and see if it does it again.

 

I wonder if they checked the connection of the exhaust pressure sensor. This seems to be the leak that most of us have been having. Crawl under your truck from the passenger side just behind the front right tire and follow the exhaust tube straight up. At the very top you will see the exhaust pressure sensor tube and the nut that connects to the exhaust down pipe. If you lean up on a shoulder you might be able to get your finger on it. Look for soot around the connection. Many have reported the nut completely loose. Mine was... it wasn't even connected... I could spin the nut with my finger. If that is where its leaking you can tighten it yourself. Its tough to reach. You might have to pull off the tire and remove the splash cover to get a little more room to reach it. Or... take it back to the dealer and let them futz with it. Somewhere here or on one of the other forums is a pic of the connection.

 

Supposedly there was a TSB about that particular leak... 11-6-22 dated June 27, 2011.

 

I re-checked mine last Saturday and found it still tightened properly. It is a LOOOOONG reach up in there but like others have said, it can be done pretty easily. The nut can be tightened with a 5/8ths wrench.

 

I'm going to check my oil cap as I've had this problem too. However I seem to notice it when the truck is in the exhaust cleaning cycle and am at a stop light.

 

Just to bring back up

 

Mine just started to do this a week or so ago, always during a regen. In fact, its one way I can tell if the truck is doing a regen in traffic. I'm going to take it to the dealer for a check and probablly coolant test soon.

 

Thanks for this thread. Mine was loose and I was able to get it tightened up this morning. Long reach even for my long ams. Knew I was due for a regen. Took it out and no fumes.

 

Holy mackerel, I need about 6" more length of arm. How did you get a wrench on this? Other than removing the wheel and liner, I don't see how you can tighten this, is there a trick I'm not coming up with?