Vent: Spent a whole shift chasing a phantom misfire on a 6.7 Powerstroke

Turns out the issue was a tiny crack in the wiring harness behind the valve cover, something you'd never spot without pulling it. Anyone have a good method for testing those injector circuits before you start tearing things apart?

3 comments

3 Comments

west.jade29d ago

Feel your pain, that's the worst kind of hunt. Honestly, it's like a rule of modern life now, the real problem is always hiding behind the one piece you didn't want to remove. For testing, a good breakout box and watching the power balance with a scan tool is my go-to before pulling covers. Still, sometimes the harness just gives up in the worst spot and you're stuck doing the tear down anyway.

richard_ross28d ago

What kind of breakout box are you using these days? I've had a few that just don't hold up to constant use. It sounds like you've got a solid method, but I still hate that moment when you know the test is going to tell you to take apart the whole dash.

sage_schmidt612d agoTop Commenter

My old Snap-on box from 2018 is still kicking without issues. Sometimes you just get a good one that lasts, and constant use doesn't always mean it will fail. I've seen cheaper units die fast, but a well built tool can handle the daily grind.