In the first 4 months of owning this truck I've had it in the shop 3 times for the MIL light. Dealer says excessive soot on the 02 sensor due to idleing too much. I do not idle the truck long. The only time it idles is when I let the grid heaters cycle, or let the turbos cool down after a haul. Could the excess soot be a result of driving at 1800 RPMs? Is it better to run a little higher? causing the engine to work slightly harder, but creating enough heat to burn off soot in the filter?

 

sounds like your dealer is grasping for straws. your not doing anything that your truck shouldnt be able to handle. your fuel mileage would suffer if you run it at 2300

brett

 

I have a 2005 5.9 but I can't imagine that the 6.7 is much different. I live in Iowa and idle my truck 10 to 20 minutes each morning and my trip to work and back keeps my rpms at 1800. 41000 miles and no problems. Rustyshakelford has a point.

 

6.7 is a totally different animal. Dodge says no idle if it can be avoided. Sounds like you are doing fine and the dealer is playing the CYOA card. Don't let him!!!

Chris

 

Chris, what make the 6.7 so much different?

 

All the emissions stuff makes it really different and the 6.7 unlike our 5.9's have a o2 sensor.

 

I see. Emissions.

 

Im not the smartest and im sure someone else will chime in but its got some canister that is supposed to collect all the soot our trucks put out and recycle/burn it or something. Also from what ive heard, the canister gets cloged up from idleing and you have to clear it out by driving at a certain speed for a certain amount of time..

 

is this the same as the catalytic converter in the exhaust pipe. Mine has this, although not entirely complete, but no O2 sensor. I have a 2002 Z06 corvette and it is covered with them. Like ticks on a coon hound.

 

I can't help but think that in some cases, fueling stations may be selling LSD as ULSD. Idling for a few minutes each day is absolutely necessary. You can't just fire up a diesel and go like you can a gasser. If warmup is the only idling that is being done and the truck is being driven at 1800rpm or more, there is no way that excessive soot should be being formed... unless perhaps the diesel fuel itself is to blame. Of course it would be highly illegal to pass LSD off as ULSD but really... who actually checks the color or the ppm of the fuel going into the tank. Yes, some do but many more do not. If you are going to the same fueling station, even just for peace of mind it might be a good idea to take a fuel sample and get it tested by an independent analysis lab.

 

That sounds like good advice D-dude. I work for the Gov't in quality control and I can tell you from first hand experience that what is written is not always strictly followed. Fisherman, go to a different fuel station for a while. Sometime more expensive is better. sometimes not.

 

No the canister is WAY WAY different then our cats!

 

AH. You're talking about the evaporator canister. Great. Already messin up our rides. In about 20 years, these mods will definately help fuel mileage.

 

no its not an evap canister either...do a search on here for 6.7 problems and you should be able to find more. I believe it takes the place of the cat and is twice the size of it.

 

So it not only causes engine problems but reduces payload capacity. What's it for again? But getting back on subject, changing fuel might help. Fuel additives another possibility.