2500HD Running rich smell 6.0

[Rich427]

Hello, I’ve had my 2016 2500HD 6.0 since about last June. It’s been great. Has about 45k on it now. I’ve noticed when it’s running a really strong rich fuel mixture smell. Is this normal? It’s not throwing any codes and it’s been like this since I’ve owned it. Thanks - Rich

 

i also (Just this afternoon) greased the upper and lower ball joints and outter tie rod. Can’t see where to grease inner tie rod. Did not climb underneath yet to do others. 

[CamGTP]

A live data scan tool could help you confirm if most things are working in correct order. What I'd want to view are the o2 sensors fuel trims. If the long term fuel trims are within about 3-5% of zero and the short term trims aren't going completely crazy, then it's likely running just fine.

 

If the LTFT were at something like -20%, then that could be a reason for the extra fuel smell from the exhaust but most would think you'd see a check engine light for a rich condition and possible loss in fuel mileage.

 

Past that you could just have catalytic converters that are working good enough to not set codes but still bad enough to present the exhaust smell. Or maybe you have no cats and a tuned truck, but I'd doubt that lol.

[Rich427]

truck is all stock with cats lol
Hooked up the scanner.
LTFT bank 1 and 2 both at 4.7 

STFT bank 1 is at 0.8 And not moving much

 

stft bank 2 is moving more but around 0.0-2.3

[CamGTP]

That stuff checks out then. At least we know the engine isn't running rich based on the information from oxygen sensors.

[Rich427]

Thanks for the info! Appreciate it.