Truck Issue

Topic 18004 | Page 2

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Fatsquatch 's Comment
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I had a similar problem several years ago, and it did eventually leave me sitting on the side of the road. It turned out to be a faulty regen sensor not allowing the truck to run either passive or manual regen, and the DPF filter got clogged.

OWI:

Operating While Intoxicated

Rick S.'s Comment
member avatar

I had a similar problem several years ago, and it did eventually leave me sitting on the side of the road. It turned out to be a faulty regen sensor not allowing the truck to run either passive or manual regen, and the DPF filter got clogged.

Did you get a check engine light or warning? These things are all supposed to be monitored by the ECM, and let you know BEFORE you end up getting towed in.

DPF's essentially hold all the "black soot" solid particles you (used to) see coming out of truck exhausts. Every once in awhile - diesel fuel is injected into the DPF to "cook off" the trapped soot and ReGENERATE the filter element. When the regens fail - the particulate builds up to the point where exhaust can no longer flow through the filter. Since an engine is essentially an "air pump" - clog the hose and the pump can't run.

Rick

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.

OWI:

Operating While Intoxicated

Fatsquatch 's Comment
member avatar

double-quotes-start.png

I had a similar problem several years ago, and it did eventually leave me sitting on the side of the road. It turned out to be a faulty regen sensor not allowing the truck to run either passive or manual regen, and the DPF filter got clogged.

double-quotes-end.png

Did you get a check engine light or warning? These things are all supposed to be monitored by the ECM, and let you know BEFORE you end up getting towed in.

DPF's essentially hold all the "black soot" solid particles you (used to) see coming out of truck exhausts. Every once in awhile - diesel fuel is injected into the DPF to "cook off" the trapped soot and ReGENERATE the filter element. When the regens fail - the particulate builds up to the point where exhaust can no longer flow through the filter. Since an engine is essentially an "air pump" - clog the hose and the pump can't run.

Rick

Yep, got a check engine light...about 45 seconds before all the idiot lights came on and I lost power and had to coast onto the shoulder. The way it was explained to me was the sensor wasn't reading the DPF particulate levels correctly and was telling the ECM everything was fine, so the ECM wouldn't let the truck run any kind of regen cycles, and when the filter became completely blocked the truck would immediately derate. The most aggravating part of all that was Central's breakdown team wouldn't send me to a shop to have it looked at, so what I ended up having to do was sit on the shoulder for 20 minutes with the truck shut off and wait for the gunk in the filter to settle, then bunny-hop my way from Arkansas back to the main terminal in WVC about 250-400 miles at a time. That's as far as the truck would go before the filter would clog up again.

Terminal:

A facility where trucking companies operate out of, or their "home base" if you will. A lot of major companies have multiple terminals around the country which usually consist of the main office building, a drop lot for trailers, and sometimes a repair shop and wash facilities.

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.

OWI:

Operating While Intoxicated

Earl J.'s Comment
member avatar

Correct me if I'm wrong but as far as I know on my Freightliner the only way you can manually Re gen is if the Re gen light is on. I had a Re gen issue with mine and the only way the tech could initiate a manual Re gen was by hooking up his laptop to the truck.

LDRSHIP's Comment
member avatar

I am kinda leaning to something temporarily clogging up the air inlet filter or even the air inlet. The mechanic did mention an air filter code but... nothing excessive. When the computer was hooked up at the second TA she ran fine. Particle content in the DPF filter was low, no issues.

I am not up to speed on reciprocating engines, but I do know on a turbine engine when airflow gets restricted TGT/EGT skyrocket..

murderspolywog's Comment
member avatar

Your EGT will shoot up running to lean, you will also have a loss of power. I have had this problem a few times with my fuel water separator getting clogged. No codes on this anytime it's happend. On the air filter getting clogged I have had my inlet ice up in really bad snow storm. Resulting in reduced airflow and and loss of power but that put out codes

Seminole Wind's Comment
member avatar

Patrick . . Hope whatever it was/is didnt leave u stranded. Got on here to see if everything was ok but dont see anything (Hope we dont see it) smile.gif

LDRSHIP's Comment
member avatar

The truck is still chugging along. She seems a little shy on power, but still running.

Seminole Wind's Comment
member avatar

Hopefully u can get to where u need to be & get her fixed before she takes a crap !

's Comment
member avatar

Did you get to do a regen? 1 mechanic said we needed to be towed in, the second mechanic said pull the brakes then set them again. Then the 7 seconds regen proceedure worked.

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