Question about the regen process
Laughing Gas
Joined: Jul 2010
Posts: 1,155
Likes: 31
From: Idaho
regen
Dealer most likely will do nothing without a CEL set. Even then, if they cant verify say a bad EGT sensor through testing, even though there may be a CEL code, they still wont replace. My dealer did not, anyway.
Not saying you have a bad EGT sensor, but your symptoms sound a lot like mine did before it set the CEL. Mine ended up being a bad EGT12 sensor that I ended up replacing myself because the dealer would not.
Not saying you have a bad EGT sensor, but your symptoms sound a lot like mine did before it set the CEL. Mine ended up being a bad EGT12 sensor that I ended up replacing myself because the dealer would not.
EGT 12, I don't monitor that one. Yeah the dealer say no code no problems. It been regen every 100 miles for the the last 11 thousand miles.
Lead Driver
Joined: Nov 2005
Posts: 5,247
Likes: 4,267
From: Kaysville Utah
The truck will do what the computer has been programmed to do. There is a lot of variation in how each of us drive, the fuel and oil each used etc.
Active Regen does not take place until your truck has fully warmed up. So if you are doing short drives, It may not even start a regen until you get close to your destination. At which point it doesn't get to finish since you shut down and go into work. So you have lots of small partial regens.
If you drive longer drives, It will do a complete regen and your mileage between my be much greater than average joe who does lots of short drives.
Couple this with Passive regens and you may really space out how often you see an active regen. Passive regen take place anytime your EGTS are above 572° A lot of folks rarely get above that temperature. Cruising down the freeway at 80 mph is only 500°. But towing a trailer on the hiway at 70 mph equals 800° So somebody towing may be in a constant state of passive regen vs a unloaded empty truck never seeing a passive regen.
This all gets confusing when we consider when soot is created. Diesel trucks throw off lots of soot when they are running rich.( look at any kid with a chip and big injectors rolling coal) So if you jump on your throttle a lot, You are throwing soot down the exhaust pipe but not keeping the EGT temps hot enough to passively burn it off.
I seriously think folks worry too much about regens and when they happen. Let the computer do it's thing.
Active Regen does not take place until your truck has fully warmed up. So if you are doing short drives, It may not even start a regen until you get close to your destination. At which point it doesn't get to finish since you shut down and go into work. So you have lots of small partial regens.
If you drive longer drives, It will do a complete regen and your mileage between my be much greater than average joe who does lots of short drives.
Couple this with Passive regens and you may really space out how often you see an active regen. Passive regen take place anytime your EGTS are above 572° A lot of folks rarely get above that temperature. Cruising down the freeway at 80 mph is only 500°. But towing a trailer on the hiway at 70 mph equals 800° So somebody towing may be in a constant state of passive regen vs a unloaded empty truck never seeing a passive regen.
This all gets confusing when we consider when soot is created. Diesel trucks throw off lots of soot when they are running rich.( look at any kid with a chip and big injectors rolling coal) So if you jump on your throttle a lot, You are throwing soot down the exhaust pipe but not keeping the EGT temps hot enough to passively burn it off.
I seriously think folks worry too much about regens and when they happen. Let the computer do it's thing.
Laughing Gas
Joined: Jul 2010
Posts: 1,155
Likes: 31
From: Idaho
regen need help.
My short drivers are 30 miles. I let the rengen finish in most cases. I drive 500 miles one way in one day and I will see 4 full regen's. Still no light no problems. Gotta love dealers.
Pressure soot load increase once the truck warms up. I think the SCR turns on and that when the level go up. Level go up most quickly when engine is warn and a slight down hill.
Oil level are good. I use 5 40 syn Valvoline
On the egt sensor I order new sensor. I will replace egt 12
When you say check function of EGR what do you mean? I think EGR shuts down when truck is warm and the SCR turns on.
On diesel I top tier diesel
Pressure soot load increase once the truck warms up. I think the SCR turns on and that when the level go up. Level go up most quickly when engine is warn and a slight down hill.
Oil level are good. I use 5 40 syn Valvoline
On the egt sensor I order new sensor. I will replace egt 12
When you say check function of EGR what do you mean? I think EGR shuts down when truck is warm and the SCR turns on.
On diesel I top tier diesel
Laughing Gas
Joined: Jul 2010
Posts: 1,155
Likes: 31
From: Idaho
regen need help.
My short drivers are 30 miles. I let the rengen finish in most cases. I drive 500 miles one way in one day and I will see 4 full regen's. Still no light no problems. Gotta love dealers.
Pressure soot load increase once the truck warms up. I think the SCR turns on and that when the level go up. Level go up most quickly when engine is warn and a slight down hill.
Oil level are good. I use 5 40 syn Valvoline
On the egt sensor I order new sensor. I will replace egt 12
When you say check function of EGR what do you mean? I think EGR shuts down when truck is warm and the SCR turns on.
On diesel I top tier diesel
Pressure soot load increase once the truck warms up. I think the SCR turns on and that when the level go up. Level go up most quickly when engine is warn and a slight down hill.
Oil level are good. I use 5 40 syn Valvoline
On the egt sensor I order new sensor. I will replace egt 12
When you say check function of EGR what do you mean? I think EGR shuts down when truck is warm and the SCR turns on.
On diesel I top tier diesel
Laughing Gas
Joined: Jul 2010
Posts: 1,155
Likes: 31
From: Idaho
EGT Sensor
I have only one on order I will order another. I will replace EGT14 and EGT13, Just verify. Someone recommend EGT 12 Which is next to the CAC.
Thank you for the help. I will update after replacement this weekend
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breeno
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