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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old August 15th, 2019, 03:23   #61
oilhammer
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Mack refuse trucks had constant issues. They never ran down the highway unless one of us mechanics took them out. On and off the throttle and they never properly regened because they would get shut down. Worst part there is the ecu would derate the engine and the operators generally didn't bring them in until it was too late. Once past a certain point a regen could not be forced without dealer specific software.
Point being, a diesel with DPf's need to stretch there legs on a regular basis. Tough on manufactures also as the government mandated a 5yr warranty. Backhoes were especially troublesome also.
Don't most of those types of applications just have a manual regen method? I lamp that comes on telling the operator one is required, and then a switch that starts the process? I know John Deere does. They use two modes: Auto and Parked. In either case, the light will flash and then come on steady during. Which is something I think would/could be useful in passenger cars and light duty trucks.

Technically, the DPF light coming on is supposed to tell you a regen NEEDS to occur, as it has failed X many attempts. However a lamp that comes on telling you when the process has started would be helpful, because then you would KNOW and, if at all possible, you could slightly change your current driving to allow it to complete.

But the way Volkswagen (and I assume MB and the rest?) have it, once the light comes on, you've already failed any passive attempts.
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Old August 15th, 2019, 05:40   #62
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Yes they do. However, municipal management priorities are not inline with common sense and can be extremely frustrating. Operators of refuse trucks get pushed hard.GPS systems and tracking systems on cart tippers. The videos provided some entertaining moments for us. Philosophy went from PM maintenance to damage repair.
But yes, the warning system is very good thing to have.
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Old August 15th, 2019, 06:31   #63
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Philosophy went from PM maintenance to damage repair.
....
Boy isn't that the truth?
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Old August 15th, 2019, 07:02   #64
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They ended up with a revolving door on the shop. An open job posting for mechanics. People used to claw at the door to get in there, now they go the other way. Quite sad actually because it was a great job except for about the last two years I was there.
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Old August 15th, 2019, 07:16   #65
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I think most decent professionals would rather maintain than repair. I know I certainly would. Stuff breaks no matter what, but on vehicles that get regular proper PM it is FAR less frequent, and many things can be done proactively if it gets seen regularly.
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Old August 15th, 2019, 09:04   #66
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When I started PM’s were performed monthly with oil changes at 150 hours. Even if a vehicle didn’t need oil changed it got looked over and greased. It was rare to have a vehicle break down in the field. Then oil got pushed beyond 350, fuel filters often past 1200, break in oil on roots blowers that should have been changed at 100 was going nearly 2000. Mechanics were bored and disgusted and the ones who weren’t lifers in the defined pension system left. Quite depressing change to a job that was once fun and highly sought after. Once I was vested in the pension I no longer had a desire to work there and simply walked off. Nothing to take pride in.
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