Cummins X15 after treatment issues

[Rawze]

The aftertreatment systems collects soot.. not generates it.

Attacking clogged up filters (The DOC and DPF) only temporarily reduces the accumulation, and does not solve the problems of the engine making excessive soot.

An EGR/engine tune-up needs to happen to bring the truck, its engine, and its emissions systems to their former glory.. and no repair shop is going to do that.

Its like your calling the fire department because the whole forest behind your house is on fire, and all they do is put out the one tree next to your house, and tell you to call them back over and over (so they can milk you for all the moneys you are worth, charging you a fee each time), instead of taking care of the bigger picture.

Sad part is that it is not their fault. They are not trained to deal with an engine that is causing the excessive soot, yet has no immediate faults for it. They are only trained to attack the cans under the truck over and over and sell you expensive parts when you complain.


ALSO: If your old-school mechanic does not have the skills to actually troubleshoot modern equipment + use modern diag. tools on engines that have now been the norm for 15+ years these days ... then that person needs to GO!!> FIRE THEM, or tell them to get with the times and bring themselves up to speed REAL FAST!. or find someone else that actually knows how to use a computer and troubleshoot.

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START by performing EGR tune-up work.

STOP GUESSING AND TAKING YOUR TRUCKS to the typical repair shops that have the training and brains of a squirrel.

I also noticed that you are accusing the engine of revving up its turbo at idle. THIS IS ACTUALLY SUPPOSED TO HAPPEN for rapid warm-up of the DPF, DOC canisters ... although it is not supposed to be excessive. Again .. if it is excessive.. then that points right back to the ENGINE having issues with its EGR system due to excessive soot buildup in the egr cooler, piping, sensors, etc.. covered and clogged with soot, and not reading right. -> and NOT the cans under the truck.

HOW OFTEN is the engine's EGR system taken apart and cleaned all out?.... HOW OFTEN is the IMAP and other egr sensors cleaned or replaced?. -- Again, that is almost always where the culprit is and not those exhaust cans alone.

There are exceptions to this. If the engine is bleeding fuel, coolant, and/or oil into its exhaust, it will clog the systems quickly. However this is easily observed by taking pictures of the clogged faces of the components + posting them here.. and analyzing any buildup to see if it is coolant, oil, etc. ... this will tell someone this right away.

Your descriptions so far however, seem to point towards engine neglect most of all though.

AND: When is the last time the guts of the fuel pump were replaced on the engine with more than 400k miles?. - The fuel pump guts need replacing (plungers, rollers, tappets) every 400,000 miles or 8,000 run hours.. regardless of condition to prevent catastrophic engine failures and metal shavings (without warning) getting into the oil and eating everything up.

Also, if you had a premature overhead cam failure.. THAT IS YET ANOTHER SIGN ON NEGLECT!. perhaps your guru old-school mechanic has no idea how to do all of the preventative maintenance, required tune-up work, etc. on modern engines?.. this sounds to me like your biggest issue at this point. #1 cause of overhead cam failures is neglect of the crank case filter.. allowing too much crank case pressure to build up in the engine for one reason or another. Another is overhead valve adjustments not done every 2 years or 250k miles. = neglect.

more info on EGR tune-up;;;
http://rawze.com/forums/showthread.php?tid=7&pid=9#pid9

Checking the fuel rail and the injectors to ensure they are not bleeding excessive fuel and making excessive soot...
: http://rawze.com/forums/showthread.php?t...3#pid75483

Then following this up with CAC leak tests, EGR system leak tests.. DPF, SCR, DOC sensors cleaning, inspections, and replacement as needed,. etc.etc.etc.

followed by checking the DEF system and the decomp tube to ensure it is not clogging up too...
ref: http://rawze.com/forums/showthread.php?t...07#pid1807

Last but not least.. also posting the regen history on here, + maybe the graph of engine usage etc. from one of the trucks,. etc. for further discussions on how healthy the systems really are. Maybe some history on how much these things are idled, what type of truck operations & how much stop/go driving, etc.etc. rear end ratios and rpm's typically driven, etc., too.