My 2015 F350 has 150k on it. Just bought it a couple months ago. Had a friend whos a ford tech turn on the Filter % on instead of the ghost screen. Was on my way to dropping my dogs off at the boarder and it hit 100% full and the regen message came on. It dropped down to 90 by the time I got there and left it running for the 10 minutes or so while dropping them off. When I went to leave it was down to 60% but never dropped any lower. Never shut the truck off so it shouldn't of stopped. It possible it couldn't clean it to any lower or does it do better if your driving or possible I might need to replace the dpf soon? Thanks

 

once you shift to park the regen stops

 

Did not know that, thought Id seen others leave theres sit and idle when they got home until it was complete. They must of sat there in drive? Thanks for the information!

 

Shifting to neutral will do the same thing. When the regen starts there's enough fuel dumped into the system already to let the regen continue to clean the DPF for a while.

I really dislike interrupting a regen in progress, but I'm not going to sit there for 15 minutes with my foot on the brake. I have extended my drive a couple times to let it finish, but it always seems to start a regen when I'm a mile from my house with a trailer in tow.

 

Stationary regens (sitting in your driveway) are operator commanded regens and are done in PARK. That is separate from the active regens that occur in normal driving that do stop when you put the truck in PARK. Regens have a lot of complexity to them as to when they start, when they stop, and if they will resume after a stop. You don't have to run the DPF down to zero to have a successful regen. Regens are not something that actually require your participation. If your use is nothing but slow speed, lots of starts and stops such as would happen with a delivery vehicle, then eventually you would get a message telling you to drive the vehicle. What this means is that the DPF is full and your driving routing doesn't allow it to clean itself, so the computer is telling you to get out of the highway and let it run through a regeneration.

 

Or dropping below a certain speed. So, sitting at a stop with it in D won't complete it either.

 

Just one stop would kill the regen? I thought it had to be stationary for a certain amount of time.

 

It all depends on a lot of factors Jim. Sometimes it stops after a drop below a certain speed and restarts. Sometimes it doesn't. Although, what I was trying to say was, sitting stationary in drive won't get anything done.

 

It won't necessarily always cause the regen to stop when you're at a red light. Last summer I tried what I called my "regen loop" when i came up with doing a "loop" in my local area in which that loop had 7 signals (right turns). Speed varied from 45 mph to 55 mph in some spots. But the key was making sure EGT4 (after the DPF) got hot enough like in the 900s to 1000 degrees. Then it would cook down fairly well sitting at the lights but they were quick lights as well. I would also not have the truck in 6th. I drive in T/H mode so I'd lock out 6th... And 5th I believe to keep the RPMs up if I'm remembering correctly.

I usually do my regens on a 65 mph expressway here that as I drive south, altitude climbs so it gets the EGTs up pretty good. I lock out 6th as it seems the regens get down quicker instead when driving in 6th.

I also had a regen start when I was on a local road and speed was 55 mph then drops to 40 or 45 I believe. I didn't regen for many miles but it was enough to get the dash to say 75%. So it never went back back into regen again until at least 200 miles when DPF went back to 100%.

About the doing 5th gear regens, I read it here and for me, seems to work.

Always remember if you get to your destination while in an active regen, make sure after you place truck in park to shut it off, make sure you idle a bit to get the excess fuel out of the combustion chambers so it doesn't leak past the rings and get into your oil. Also make sure EGT1 gets down to 400 degrees to help prevent coking up of oil in the turbo.

 

The sweet spot for a regen is 2000 RPM not the speed. You will notice if the RPM's are not at or above 2000 the turbo will add boost to move the fuel into the exhaust. I have successfully completed an active regen in stop and go traffic by keeping the truck in a low enough gear to maintain 2000 RPM as much as possible.

On the other hand I was in stop and go traffic during a regen for far to long and the regen aborted due to the slow speeds.

 

My truck started a regen tonight, ignoring that I was under 50 miles to empty. Not a big deal this time, just an observation. I was driving around town at not more than 45 MPH, stopping for a few stoplights. I kept driving until the regen bottomed out at 25%.

 

Usually heavy towing keeps it from regen. Keeps the soot burnt off. That is the best thing.

A monitor to show the active regen is in progress helps, then you know where you stand. That monitor can show soot % and that gives an indication you are getting close.

As said above, locking out gears, keeping the rpms up helps with the efficiently of the process.

I have found that at 50-55 mph is the best regen speed it that helps.

 

Did you just figure that out yourself or read that somewhere dirt? Because now it makes sense to do my regens in 5th gear because the RPMs are at least 2k... and they also complete sooner.

I just had a regen, did in 5th, but was going northbound on the expressway which the altitude drops. When it shut off, the gauge said 40% but the next day when I started it, it said 35%. It usually gets lower than that but like I said, I contribute it to going downhill and EGT4 did not hit 1200 deg F like it does when I'm climbing the hills going southbound.

Do you guys ever wonder what the people smell as you pass them or the ones behind you while you're in a regen??

 

Personal observation is how I came to that conclusion. Also a stationary regen runs at 2000 so that RPM is what Ford engineers feel is necessary for a proper regen.

I also feel this is why people post about locking out the upper gears and achieve a faster regen just like you do.

 

good to know, I have had regens take up to 40 miles.