1
Found out last week that a single loose injector can cost you 2 mpg on a Cummins ISX
I was digging through some old fleet maintenance reports from a shop in Nebraska and saw a pattern I'd never noticed before - they tracked fuel economy before and after injector replacement and the gain was almost exactly 2 mpg every time. Has anyone else seen that kind of jump or was this just a freak case?
3 comments
Log in to join the discussion
Log In3 Comments
ramirez.caleb26d ago
Man, I used to be one of those guys who thought injectors were either working or they weren't. Like a light switch. Then I had a buddy's Pete with a Detroit 60 series, and it was getting 5.8 mpg no matter what he did. He swapped out one injector that tested just barely out of spec, and it jumped to 7.2. I wrote it off as a fluke till I saw a similar thing on a old Cat C15 where a loose injector was dumping raw fuel into the cylinder at idle and just burning it off. Numbers dont lie, and your shop's data backs it up. 2 mpg is real, and it's probably happening way more than people want to admit.
3
fiona_webb1mo ago
Woah, that's a huge jump... 2 mpg from just one injector is wild. It makes me think about how small, broken parts can quietly eat away at efficiency in so many things. You see it with everything like a fridge door not sealing right or a tire a little low on air... these tiny failures just compound over time. It's like your body with a slow infection or something, you don't notice the energy drain until you fix it and feel brand new again. Probably a lot of fleets are running around with a few loose injectors and no idea they're leaving money on the table.
1