Regen too often

One of techs told me that cummins uses pressure washer to clean filter but you want to bake it and then wash out remaining ash residue. Not sure if that's the reason or not

 

We were told that we can pressure wash them by a tech as well, we're going to buy a new filter and try to wash the old one, best case we have a spare, worst case, old filter is garbage.

 

How many thousands is new filter?

 

Typical dpf clean is around 250-300k I agree with that.
Have had one very, very clean burning truck that made it to 400k before jumping Inhg pressures.

Dpf isn’t thousands, just A Thousand, give or take a couple dollars.
Your catalyst on the other hand...

First, If you don’t already, at least clean your air filter because it’s just good maintenance.
If you aren’t using water or oil that’s a good sign.

Good regen = air and fuel gets the whole dang truck hot starting with the dpf all the way to burning your hand on your door jams lol.
First off, you don’t have any wiring or voltage codes just pressure codes.

It could be a bad dpf itself if you’ve already had it replaced for some reason. An issue caused the other one to go bad to begin with. Maybe could’ve been a bad dpf? If you change it it’s going to more than likely temporarily fix with good numbers on your regen board but you have another underlying issue.
Dealership is supposed to weigh them after cleaning, and should be within weight spec and I do not know what that spec is or how much it is supposed to weigh, I’ve never had to ask, actually. No matter how they do it with a pressure washer, their baking machine, or blowing them out with an air hose. The last way is the way John Doe does this. This is the way John Doe has found to be very successful over the past 10 years and with over 100 Cummins isx 15.

1. Check for exhaust leaks, any black soot from your egr pipe (small leak here won’t cause all your problems) on the passenger side of the motor, or ANY spot what so ever from ANY PIPE after your turbo to the very end of your dpf. I have welded the end caps of doc where they were leaking significantly around the end cap where they start. I have seen flex pipes broken completely in two and still perform a good stationary regen, some won’t.
This is pretty important considering you had someone clean your dpf and I’d be afraid to say that 50% of work done by someone else isn’t done completely here. I have seen road work AND dealership work done upon arriving back, completely leaving the flex pipe unclamped....wtf?

2. Have you ever had any injectors replaced? If you have over 500k sometimes before, this is a major issue. Take it to someone who has Cummins Insite. You can perform an injector leak down test in 60 seconds, literally. With just a computer. If it is leaking down then it would be process of elimination by shutting injectors off.

I always start here because it’s just too simple not to and should be checked before they run out of warranty to save you a grand if not more if more than one is bad.

I will give every single person that is lucky enough to read what you’re about to a you’re welcome.
Any single mechanic that can’t tell you specifically which injector or injectors need to be replaced before you even pick up your 13mm socket and impact to remove your air intake is an absolute fool.
I am speaking for the isx 15.
Pressure leak down can then be determined if it actually is injectors if it is in fact leaking down. If it isn’t any of the 6, go to the fuel rail check valve, then with the older model you have which sometimes the “ceramic” pistons in the fuel pump head to crack and leak too. Just remove it and look at them.

A leaky injector will not code, not sure if there are others but only ones I ever see are for solenoid circuit voltage.

A leaky injector doser will not code, can only be unbolted and run the test and measure the fuel it produces. It can also not be dosing at all causing it not to even get hot to begin with.
A slightly leaky doser... you can get by with for a little while. A pouring doser... you WILL NOT make it 1000 miles.

3. Check your catalyst (Diesel Oxidation Catalyst) this will not do the burning needed to do the regen.

4. Check your turbo... air and fuel

5. Check your VGT Actuator. Again you don’t have circuit codes or out of calibration but sometimes it won’t code.


Please let us know how this turned out for you.
Blazen.

 

I really appreciate the reply Blazen, this is a company truck and we have an on-site mechanic, he has been banging his head against a wall trying to figure this out, I will print and give him a copy of your post as Peterbilt and Cummins has not made any progress on this. It tries to Regen at least twice a day, with only 200-400 a day out on the truck. I will keep this thread updated as it may help someone else in the future having these issues.

 

Time to update, thanks to Blazen03 response I did notice what seemed to be exhaust coming out from under the cab during a Regen episode, I showed the conversation to our mechanic and found the inlet pipe that goes into the DEF filter was worn through about halfway around where the flange is. We pulled and cleaned the filter, got a new inlet pipe and replaced the doser, and so far since 25th of April it's been running like brand new. It should be coming up time to do a regular Regen, and once it performs a Regen I will know if it will revert back to it's old ways or is actually fixed, I will update again as soon as it does this. This has been a pain for many years driving like this, it's a local truck, never more than a few counties away from home any work day, so all local miles. I really appreciate all of the help from everyone.

 

My truck does exactly what you are describing. Have you been able to resolve it? I replaced the Delta P sensor amd still acting the same way. The many mini regens are killing fuel economy and forcing full regens far too frequently.

 

Yeah I went to cummins and they said they're too busy...had a line of motorcoaches to work on. F owner op.
Guy came out "its probably your turbo" I said no turbo is brand new...oh then its dpf...basically started listing all most expensive parts he could think of.
I thought its plugged 7th injector.
I went and got permanent fix for it. Haven't had issues since.

 

Where could I get a permanent fix for mine.