Question about a weird injector knock on a 6.7 Powerstroke

Had this truck with a knock that sounded like a rod but only at idle. After checking everything, I tried backing off each injector line nut one at a time with the engine running. The noise stopped when I cracked the line on cylinder 3, so I swapped that injector with a spare. Fixed it in twenty minutes, saved the guy a teardown. Anyone else used that old school trick lately?

3 comments

3 Comments

shaneb161mo ago

Ever think about what makes an injector start knocking like that in the first place. Was it a bad internal part or maybe some trash in the fuel that wrecked it. Could the guy have a bigger fuel system problem that killed that injector.

garcia.laura1mo ago

My old truck had a knock I swore was a bad injector. Turned out to be a tiny piece of the fuel filter media that broke loose and got stuck in the line. @shaneb16 is right to ask about trash in the fuel, because that's exactly what got me. I used to just swap parts first, but that mess taught me to check the whole system. Now I always look for the root cause, or you'll just kill the new part too. It's usually something simple that gets overlooked.

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riley_west1mo ago

Classic case of fixing the symptom and not the cause. People jump straight to the worst case scenario now instead of doing the basic checks first.