Hey all, 2015 F250 CC 4X4 with 66K on it.

Had the truck at the dealer for a P24A0 code and it would not regen. They decided it needed all 8 injectors replaced. Seems to have fixed the issue.

However, leaving work the other day, the "cleaning exhaust filter" message came on, so I went for a drive. It took forever to do its thing. After a little over 30 miles, the filter got down to 30% and terminated the regen on its own. Why does it take so long now?

Now, I have heard all the arguments for deleting, but, until I retire and move out of this heavily regulated state, thats not an option for me,,,,,,unless your brother, father, or friend owns a smog shop you can send me to.

 

How many active regenerations have you had (noticed) since the injector repair?

 

2 so far. My wife thinks I'm crazy, but to me the engine sounds a little different also.

 

Everything that I read regarding a P24A0 code pointed to a failing NOX sensor on the DPF. Which would explain why it wouldn’t regen. I’m assuming you’re out of warranty? I can’t see them replacing all 8 injectors unless it was on your own dime.

Do you have another way to monitor your DPF soot load? I’m assuming that you’re going off of the enabled ghost screen DPF % meter. I can tell you that the actual soot load and the % meter have quite a variation between the two. I hit DPF full the night before last. My soot load meter on my Banks Derringer iDash showed 119%. I set my cruise control at 75 mph and drove to let it do it’s thing. My DPF is only 6 months old btw. When my ghost screen showed 70%, my actual soot load was already at 31.2%. At 65%, it was down to 27.9%. At 50%, it was down to 13.7%. At 25%, it was down to 0.0%. That was when my regen went from Active to Off. By the time I got home, the ghost screen showed 15%. It did this all in 22 miles, running 75 mph. Without a monitor of some sort...you have no way of knowing when your regen kicks off.

The pictures below show my Derringer. These are my parameter readings that I set up to monitor:

1. Engine Coolant Temp 2. DPF soot load %
3. Regen On/Off Status. 4. Battery Voltage
5. EGT 1/1 6. EGT 1/2
7. EGT 1/3 8. EGT 1/4

EGT 1/X = Exhaust Gas Temperature sensors # ​​1-4

I like to monitor my EGT sensors in case one of them goes bad. A bad sensor will leave you stranded on the side of the highway. Thanks EPA! If you had a way to monitor them, you probably would’ve known if your P24A0 code was related to a bad sensor.

70% showing on ghost screen









Regen now Off



Ghost Screen still depleting 5 minutes after regen kicked off.

 

Forgot to mention...I also lockout 6th gear during a regen so it will really get the exhaust gas temps up. Heat makes the DPF works best!

 

I would get something like the idash too. That can help a lot.

 

​​​​​​ . The dealer checked the EGT's and were ok. They ran some other test and the Ford "Hotline" told them to replace all the injectors. The repair was covered under the 100K powertrain warranty.

I can usually tell when a regen stops by the way the turbo behaves while in regen. I am going to look online for one of those monitors mentioned above. I lock out 6th gear as well.

 

If you're not already doing so, I would advise you to start running Better Diesel FBC in every tank of fuel to help prolong the life of your DPF. It should also shorten the length of time it takes for your truck to complete a regen. I can't really do a before and after, as I started out with a new DPF in my truck right after I bought it. Perhaps others can chime in with their experience.

 

Others and myself have tested the locking out of 6th gear during regen and found it does not help as thought. The regen lasts is not any faster nor does it use any less fuel in my testing of this.

 

Although I have not done any scientific tests to prove one way or another, I believe Larry is right on the money with this. Basically, all one is doing is spinning the engine a little faster. I have tried it both ways, and it always takes about the same amount of tie.

 

Great info here. Thanks guys. As to my routine during a regen, I do them on the expressway I take to and from work. The MPH is 65. I'm usually doing 70 to 75 and it climbs in altitude as I head home. I run 6th gear and see 1100s when in REGEN with a slight chance EGT4 will hit 1200 as it's done some of the time.

 

Well, i am already up to 70% adter this weekends trip, so I'll wait to see what happens with this cycle.

 

I've played around with locking out upper gears during a regen and found that at 2000rpm the engine provides the highest EGT's with no help from the turbo. Anything less then 2k and the turbo will add boost to compensate. The trick is to keep the EGT's in the 1000's+ for the fastest regen.

I was in slow traffic on the highway during a regen once and I locked out all gears except 1st and maybe 2nd depending on the speed at the time. I was able to keep the EGTs up higher by continually rolling rather than stopping and idling then pulling forward and slowing down again.

 

That's good info to know right there! I was just going off of what the dealership told me to do. I was told to lock out 6th gear, and drive the **** out of it for the best and quickest results. I haven't felt the need to run it hard while on the interstate. Has anyone noticed a difference in regens while towing a significant load?

 

When towing, you will experience passive regen action. This is when the temps of the exhaust exceed approx 750*. This will keep the soot levels lower but even wth passice regen, you will still experience an active regen but it might start at a lower soot level and the % full might be well below 100%.