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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis


Old 06-01-2011, 07:26 AM
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Originally Posted by aquaman View Post
I think the algorithm that runs the regens is not just based off a simple pressure differential across the DPF. It likely takes in account how much air mass is supposedly moving though the engine as well.

I once made a run with the back loaded up the I-5 Grapevine with 25psi boost most of the way just to be welcomed with a regen right after I got over the top and shortly after I let off the throttle. Nice... instead of squirting in a little more fuel on the way up on a hot engine, it chose to do it on light throttle on the way downhill. Similar thing happened on another trip up I80 leaving Reno going toward Sacramento.
That's happened to me also and it makes sense. If you think back to when we made soot before DPFs, it was on a hard wide open throttle run. That would put more soot in the DPF. So, while the wide open throttle is doing more in passive regens, it is also emitting more soot to filll the DPF. When we back off the throttle that reduces the level of passive regen so the computer calls for an active regen. Besides, at the rate this motor sucks down fuel the wide open throttle may not leave enough fuel capacity to fire on the exhaust stroke LOL.
Old 06-09-2011, 06:05 PM
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I got the updated flash, but prior to 5/18. Last Friday I had my first experience towing the RV; about 45 mile trip to RV dealer for Norcold recall. When I get on the Interstate I notice I have a continuous display of "Cleaning Exhaust Filter". It stays on for about 10 miles down I-35; I then exit and it was on another 4 miles; then it goes off. I double check manually and it is not in regen.

We went to a local lake for the weekend after the RV dealer finished. Sunday, on return trip, we had about 8-10 miles of hilly 45-50 mph two lane road; right as I am accelerating on the entrance ramp to I-40 it displays for about 5 seconds; "Cleaning Exhaust Filter". 5 minutes later the message comes back on continuously for about 20 minutes IIRC.

Never saw drive to clean. Prior to towing but since the flash; I have not seen "Cleaning Exhaust Filter" except when I checked manually.

Truck towed RV just fine. No codes, boost as high as 32 IIRC. I didn't really ever push it at full throttle though; maybe next time. 70 MPH on Interstate, could not tell any difference from prior to the flash; truck pulled like a champ.

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