I am currently traveling with “The Dominic” (2010 BB Vision; 6.7 Cummins ISB; Allison 2500). Changed both fuel filters on Wednesday, prefilling both before installing and took it out for a 20 min drive to get it up to temp - ran fine.
Drove from Houston to Kerrville Friday - 260 miles, no problems, except for one issue where the bus stalled when started (after a rest break) and put into Drive. After arriving, had the same issue when the bus was started after being shut down - i.e., stalled when shifted from N to D….both of these cases the bus was still warm…in both cases, I hit the manual prime pump at the low pressure filter and managed to get it started/moving, in the latter, I let it sit for a couple hours before doing this.
My initial thought was that maybe there was some air still in the fuel system, and that when the engine was warm, perhaps this exacerbated the issue. However, this afternoon I took it out to fill the tank and run by the store, leaving it running while I was in the store (maybe 10 min). After pulling onto the main road, the bus lurched as if it was stalling again, so pulled over, shut down, pulled error codes: FMI 2 / SPN 101 (fault code 1942 - Crankcase Pressure - Data Erratic, Intermittent, or Incorrect) and FMI 2 / SPN 627 (fault code 4429 - Power Supply Lost With Ignition On - Data Erratic, Intermittent, or Incorrect) both Historical, not Active … did the fuel pump thing and was on the way again in 5 min…back on the main road, it did the same thing again and the power was severely lowered as I limped back to the hotel.
Let the bus sit til after dinner, then went and looked again at fault codes…had one active at “key on” FMI 7 / SPN 2633 (fault code 3616 - Engine VGT Nozzle Position - Mechanical System Not Responding or Out of Adjustment)…started the bus and idled for several minutes, and on starting the code went to Historical… (As a side note, I did get this same code about a month back, but not accompanied by the loss of power that I got this afternoon.)
So now here’s the question: is it possible that a dirty crankcase filter could be causing the 1942 and 3616 fault codes?? ….or something else….
I’m planning to change the crankcase filter tomorrow (have a new filter and not entirely sure how long ago it was changed - not since I’ve had the bus, so 4-1/2 years min). Will also try to check the connectors for the turbo actuator and crankcase pressure sensor (if I can get them apart), but would appreciate any input…
Drove from Houston to Kerrville Friday - 260 miles, no problems, except for one issue where the bus stalled when started (after a rest break) and put into Drive. After arriving, had the same issue when the bus was started after being shut down - i.e., stalled when shifted from N to D….both of these cases the bus was still warm…in both cases, I hit the manual prime pump at the low pressure filter and managed to get it started/moving, in the latter, I let it sit for a couple hours before doing this.
My initial thought was that maybe there was some air still in the fuel system, and that when the engine was warm, perhaps this exacerbated the issue. However, this afternoon I took it out to fill the tank and run by the store, leaving it running while I was in the store (maybe 10 min). After pulling onto the main road, the bus lurched as if it was stalling again, so pulled over, shut down, pulled error codes: FMI 2 / SPN 101 (fault code 1942 - Crankcase Pressure - Data Erratic, Intermittent, or Incorrect) and FMI 2 / SPN 627 (fault code 4429 - Power Supply Lost With Ignition On - Data Erratic, Intermittent, or Incorrect) both Historical, not Active … did the fuel pump thing and was on the way again in 5 min…back on the main road, it did the same thing again and the power was severely lowered as I limped back to the hotel.
Let the bus sit til after dinner, then went and looked again at fault codes…had one active at “key on” FMI 7 / SPN 2633 (fault code 3616 - Engine VGT Nozzle Position - Mechanical System Not Responding or Out of Adjustment)…started the bus and idled for several minutes, and on starting the code went to Historical… (As a side note, I did get this same code about a month back, but not accompanied by the loss of power that I got this afternoon.)
So now here’s the question: is it possible that a dirty crankcase filter could be causing the 1942 and 3616 fault codes?? ….or something else….
I’m planning to change the crankcase filter tomorrow (have a new filter and not entirely sure how long ago it was changed - not since I’ve had the bus, so 4-1/2 years min). Will also try to check the connectors for the turbo actuator and crankcase pressure sensor (if I can get them apart), but would appreciate any input…