Active Jake acts like regen lowers soot and pressure

[Rawze]

(05-28-2021 )dhafuje Wrote:  ...
After the turbo replaced for no reason because Cummins said it, they suspected the turbo rpm was
...

$35000 parts and labor in 1 year, last week Kenworth said bring in the tests fuel systems $650 diagnostic snap test again checked dpf and doc restriction test dpf, they said we cannot find anything
...

Well, first and foremost... you went to the stealers$its to have that type of work done. They are going to rape you over and over until their expensive guessing finally fixes it .. or you will go broke paying them endlessly to throw the most expensive parts at that they can come up with.. those OEM repair shops are only trained to sell you parts and not solve anything properly. - THAT is why you spent $35,000+ and got nowhere with it so far. Your letting them get you for all that you are worth. <- that seems to be problem #1.

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As far as your problem goes... start by posting a pic or 2 of the regen history. That will let everyone on here know what it is doing overall.

You also did not mention how many hours/miles is on this engine, etc. that may help too. ALso when was the last time the software was updated?

What is the engine ser#, and what software is Insite reporting is installed into the engine?

- Those would be good places to start so that others can see more of what is going on.

Also, when did this problem start?

- Has anyone replaced the exhaust back-pressure sensor?... and verified the circuit for it was clear?.. The small pipe that feeds it and the channel for it through the thermostat likes to plug up, make it have bad readings... a all while never throwing a fault.

- Lastly,.... if it has been a month or 2, and is throwing faults all over again for excessive pressures... pull the DPF/DOC and take pictures of their faces. Have then baked, de-ashed, and flow-tested again... make sure they are still good. Post pics of the faces on here for some opinions ... See how clogged up they really are. - It is a filter, it does not make soot or get face plugged that quickly without the engine causing it. Find out what the DPF is getting plugged up with and is complaining about.

- Also.. are these after-market units? or are they reman? or are they OEM?

Also, how old is the SCR element? and has anyone inspected its face? to see if it is starting to plug up?


* Has anyone bothered to pressurize the whole engine (front and back of turbo plated off) to 30-psi and looked for boost, exhaust, and EGR leaks? .. I am betting they have not.

* Will it pass a rail leak.down test?.... if so, then what is the leak rate after 1 minute?

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just some thoughts that come to mind so far.

If you don't start grabbing a wrench and taking your problems into your own hands then that stealers$it is going to run you out of business... because they are not trained to solve the problems.. they are trained to follow software that is about 30% accurate on its best day, they blindly do what it sais to do, and replace expensive parts until it magically goes away.

- Personally, I cannot imagine giving someone $35,000 of my hard earned $$$ for issues like that, and having no long term solution. That kind of wasted expense in trucking these days vs. knuckling down and figuring out how to solve at least the medium problems on your own is exactly why a lot of O/O's go out of business. I am guessing that you are learning this the hard way.