Spent 4 hours diagnosing an air leak that was just a loose fitting

I was chasing a low power issue on a 2015 Freightliner Cascadia and swore it was the turbo actuator throwing codes. Turned out a banjo bolt on the charge air cooler line was barely hand tight, took me all afternoon to find it. Anyone else ever waste a whole day on a simple loose connection?

3 comments

3 Comments

zaranelson17d ago

Four hours for a loose fitting? That's a bit much. A banjo bolt is pretty obvious once you're actually looking at the charge air cooler. Could've saved time by checking the simple stuff first. Turbo actuator codes would point to something else entirely, not a loose connection. Sounds like a diagnostic rabbit hole you dug yourself into. Sometimes people overcomplicate things and blame the truck.

lee.cora17d ago

Man, @zaranelson, I used to roll my eyes at people saying stuff like this. Thought they were just making excuses for bad diagnosing. But you're right that you can stare at a schematic for an hour and miss a loose banjo bolt staring you in the face. Had a buddy spend two days chasing a ghost in his F-350, swapped the whole turbo actuator, only for a loose charge pipe fitting to be the problem. Dead simple fix, felt like a total idiot after. Kinda changed how I look at these jobs now.

carr.luna17d ago

Lost a whole Saturday to a loose clamp on my old Volvo once, felt like the universe was playing a prank on me.