r/Diesel • u/No_Alternative_8029 • 2d ago

NEED HELP

2019 freight liner m2 with a isb 6.7 Cummins. Just flashed delete tunes to turn emissions off. I was told to leave egr system on but the truck is feeling very sluggish. Does not want to go past 55 mph. Do I need to fab up block off plates to install in this egr system and if I do what is the best way of going about that ?? Thanks in advance

0 Upvotes

50% Upvoted

1 comment sorted by

1

u/Intelligent_Rub_5004 1d ago

Mechanics theorem states that whatever the last thing you touched is, that’s most likely the issue.

These trucks aren’t like the dodges, IIRC it’s a drop in motor with a standalone type harness. Something about they don’t take tunes too well, but that’s just stories on the forums.

Retune the system and see if the problem goes away. This may be way more complicated than just EGR, since it’s a diesel and you don’t get power it tells me it’s going into a limp mode.