‘15 Peterbilt 579 with newly installed low mileage 180k ISX15 CM 2350. Truck is in an almost constant “halfway”(for lack of a better term) regen. It does it’s active regen every 9 to 11 hours on the regen history but this “halfway” is going on for 5 to 7 hours between those. While in active the idle fuel is 3 to 3.5 GPH, the hot exhaust is on, idle is at 750 and I can disable it with the switch. This “halfway” the idle fuel is 2 to 2.2 GPH, No hot exhaust light, throttle responds like it’s in regen, idle at 750 and cannot disable it with the switch but can stop it with the cruise set button but if I tap the brake or clutch or rev it at all, it’s back on. Has anyone seen this before? Some background……The truck was also doing this with the old engine to a point as a company truck for a couple months but my write-ups were mostly ignored. The engine sank a liner and was parked for a year before I bought it and installed the new one. Most of the accessories except the turbo, EGR cooler and ECM are off the old engine with 677k. In the last few weeks it’s been to a dealer three times with one or two tier 2, then to Cummins. Both the dealer and I have replaced many things…..complete wiring harness from the DPF to the engine, DEF doser, DPF pressure sensor, two NOX sensors, turbo actuator, cleaned and flowed the DPF, removed and cleaned other sensors. The visit to Cummins produced a report that it failed the turbo speed test and I should “START WITH”$$$$$ installing a new turbo and DPF. Got a deal on a new DPF and installed it and went to the local dealer to reset the ECM yesterday. I have a hard time believing I need a new turbo with 180k on the engine and as many times as it’s been plugged in, nobody mentioned it. The dealer installed the new actuator and I’m SURE if that arm didn’t move properly THEY would have showed it to me to sell me a new turbo. With the new DPF I have not gone anywhere yet so there’s a slight chance it may be fixed but I doubt it. Anyone have any suggestions?
No Codes! No Lights!
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by One Bad Apple, Jun 26, 2021.
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He has already tried that. Mostly just got kicked around.
One Bad Apple and spsauerland Thank this. -
Was it the same CPL, do injectors match pistons?
One Bad Apple Thanks this. -
p608, Goodysnap and One Bad Apple Thank this.
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Was it a complete new engine or what was swapped from old engine? Did you go from 2250 to 2350? Do injectors match original engine? What are two ESN?
One Bad Apple Thanks this. -
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The CPL's don't match, different pistons and injectors.
So does the software in ECM match the current engine?Rideandrepair, Goodysnap and BoxCarKidd Thank this. -
spsauerland Thanks this.
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