jwmcgregor

I have a US7 MP8 in t 2010 CHU. Not spark assisted DPF setup. I've taken care of and have now got no fault codes showing up on the engine. Soot level showed 90%. When I force a regen through TEXA I get a slow clime to about 600 deg on the front side and the back side stays 50 to 55 deg cooler through the process. I am seeing the dosing module status at 100% but no increase in temp. I tested the DRV supply pressure with my thumb at the DRV valve and It builds plenty of pressure rapidly once regen is initiated. I supplied pressure to the DRV valve when i had it removed and it operates smoothly. I find no sigh of leaks. I removed the dosing module, cleaned the tip and initiated a regen. The nozzle immediately puts out three bursts of fuel then nothing so I cancel the regen. The system completes the regen process without any errors but never reaches temps over 600 deg and soot level is higher at the end of the process. I run VGT test and I can hear the actuator traveling through it's stroke and back. EGR position says zero when truck is idling but i can't see it's position while running the regen. Pressure to the dosing module shows similar to pump pressure when the truck is idling but I can't see where it's at while running a regen. Don't know what to do next...Trying to avoid taking it in to the dealer for what seems to be a $2000 minimum fix. I purchased four of these trucks and I'm working through issues with each of them. Love the trucks and the way they are set up...struggling with the emissions stuff. Any Ideas or dirrection? Thanks

Well.. I’m in need of a doner engine for a 2010 chu613 with MP8 415C. DPF not SCR. Can anyone tell me if this 2011is a compatable donor? It is DPF and SCR family ABPTH12.8SOI Serial 938209 Thanks

I’m in need of a doner engine for a 2010 chu613 with MP8 415C. DPF not SCR. Can anyone tell me if this 2011is a compatable donor? It is DPF and SCR family ABPTH12.8SOI Serial 938209 Thanks

MacPro...is dealer level support required to put a new/used/different power plant into service on the truck?

They say “it’s never worked out. There’s always something wrong wit a sensor or something on the salvage engine”. Rediculous..I have three other matching units with 450k miles...if a 250k mile take out is not worth putting in a truck does that mean that my other three units are due for rebuild? I should hope not..

Any idea on the dealer level support needed in putting in a new short block or complete power plant? Do all the new/used sensors need calibrating to communicate with my control modules or is it “plug and play” stuff? I’m concerned about the support I’ll get if I load it up and take it out of there shop in order to install a used power plant as they will only install the Mack ReMan engine which is 4x the price of the 200k mile MP8 complete engines that I am finding available.

I'm new here and new to Mack trucks. I purchased some CHU's out of a fleet. They have MP8 415's. DPF 2009-2010 trucks. I like them as they are spec'd out perfect for what we do. However...right now one of them is at my local mack dealer with a broken crankshaft. It took the block out with it so the whole lower end is toast. Is this an issue with MP8? The trucks had rev limits at 2250 when they where delivered. I set them to 1950 shortly after they went into service. My dealer is telling me they will not install anything but a Genuine Mack rebuild engine. Is this a common practice? I can buy a low mile MP8 that's been taken out of a truck for one reason or another from multiple sources for about 25% the price of the "Genuine mack rebuilt". Does putting in a short block or another MP8 in that truck require flashing and programming at the dealer level? How tight a grip do they have on my nuts here? Thanks!