Simultaneous idle-up, turbo and exhaust brake activation

[TCDiesel]

Hmmmm .....

 

[TCDiesel]

I won't buy form any company that wines like Edge...

 

[robetha]

The newest flashes incorporate (IIRC "net zero")

I live in Fairbanks, AK and own a 2014 2500 Laramie mega-cab (2,900 miles). I have experienced the following random anomaly numerous times:

On occasion, the truck will automatically place the engine in idle-up and activate both the turbo-charger and exhaust brake. Coupled with this anomaly, the entire cab will fill with an overwhelming pre-treated diesel exhaust odor. This event has occurred at ambient temperatures as low as -36 and as high as 75, as well as an internal coolant temperature as low as 90 and as high as 194. There is no visual evidence of exhaust brake activation (ie, the indicator light), only audible cues. There are four conditions that, once met, will remove the anomaly; albeit only temporarily for three out of the four:

1. Step on the brake -- This removes the anomaly until you release the brake pedal, thereby returning to the previous condition.

2. Exceed 1800 rpm -- Like condition 1, this removes the anomaly until the RPMs drop below 1800.

3. Exceed 20 mph -- During the acceleration to 20 mph, the truck suffers a severe reduction in power coupled with an increase in boost pressure, regardless of throttle position/setting (low, med, high). Upon reaching 20mph, the turbo will wind-out (sometimes as high as 18psi boost pressure) before resuming normal operation. Subsequently dropping below 20 mph will resume the anomaly.

4. Shut off the engine and allow a complete electronics time-out -- This process requires approximately 10 minutes to execute. Simply restarting the engine is not enough to remove the anomaly. Upon restarting the engine after 10 minutes, the anomaly will usually be removed for at least the next driving cycle.

This anomaly has occurred during various stages of driving cycles ranging from initial start-up, remote start-up, and at various levels of operation during normal driving. I have tried to duplicate the anomaly with zero success (self-activation of both idle-up and the exhaust brake). Also, there does not appear to be a set duration for the anomaly's presence -- it goes away when it wants.

I read similar threads for earlier Rams that discussed a DPF regeneration. I do not think that is the case for my issue because there are ZERO EVIC messages indicating that anything is happening to the exhaust system; DPF, DEF or otherwise. In addition, there are ZERO maintenance or engine fault codes generated by this anomaly. The dealership has replaced the PCM and applied various software patches to no avail.

Thoughts?

The newest flashes incorporate (IIRC "net zero") mode that maintains or reduces the soot load in the DPF. What that means is the calibration will keep the soot load at an acceptable level and if it does climb too high (above about 47 grams on the scan tool) it will raise the idle, go into engine braking to build engine load, and possibly provide after injection to build heat to burn soot faster than it is generated. Extended idle after about 30 minutes should trigger a noticeable change in engine speed or exhaust tone indicating the soot reducing mode is active. Keep in mind every truck is going to be different because every truck has differing starting soot load at any point in time.

Also note this will keep the DPF from becoming full, but soot is being generated at all times the engine is running and EGR is active at idle, so soot is still entering and being deposited in the intake system and turbo before it gets to the DPF.

 

[Newsa]

I live in Fairbanks, AK and own a 2014 2500 Laramie mega-cab (2,900 miles). I have experienced the following random anomaly numerous times:

On occasion, the truck will automatically place the engine in idle-up and activate both the turbo-charger and exhaust brake. Coupled with this anomaly, the entire cab will fill with an overwhelming pre-treated diesel exhaust odor. This event has occurred at ambient temperatures as low as -36 and as high as 75, as well as an internal coolant temperature as low as 90 and as high as 194. There is no visual evidence of exhaust brake activation (ie, the indicator light), only audible cues. There are four conditions that, once met, will remove the anomaly; albeit only temporarily for three out of the four:

1. Step on the brake -- This removes the anomaly until you release the brake pedal, thereby returning to the previous condition.

2. Exceed 1800 rpm -- Like condition 1, this removes the anomaly until the RPMs drop below 1800.

3. Exceed 20 mph -- During the acceleration to 20 mph, the truck suffers a severe reduction in power coupled with an increase in boost pressure, regardless of throttle position/setting (low, med, high). Upon reaching 20mph, the turbo will wind-out (sometimes as high as 18psi boost pressure) before resuming normal operation. Subsequently dropping below 20 mph will resume the anomaly.

4. Shut off the engine and allow a complete electronics time-out -- This process requires approximately 10 minutes to execute. Simply restarting the engine is not enough to remove the anomaly. Upon restarting the engine after 10 minutes, the anomaly will usually be removed for at least the next driving cycle.

This anomaly has occurred during various stages of driving cycles ranging from initial start-up, remote start-up, and at various levels of operation during normal driving. I have tried to duplicate the anomaly with zero success (self-activation of both idle-up and the exhaust brake). Also, there does not appear to be a set duration for the anomaly's presence -- it goes away when it wants.

I read similar threads for earlier Rams that discussed a DPF regeneration. I do not think that is the case for my issue because there are ZERO EVIC messages indicating that anything is happening to the exhaust system; DPF, DEF or otherwise. In addition, there are ZERO maintenance or engine fault codes generated by this anomaly. The dealership has replaced the PCM and applied various software patches to no avail.

Thoughts?

These are the exact symptoms that i notice in my G56 truck when it goes into active regen.

Others who don't have the G56 tell me that i am completely wrong. Some have said that these symptoms should not be speed ot RPM dependent . This sounds like a g56 truck active regen.