Appreciation post: My $400 scan tool saved a job I almost walked away from

Had a 2018 Ford F-150 in the bay with a rough idle and a P0300 random misfire code. I was about to start the usual swap of coils and plugs, which would have been a big time sink. On a hunch, I hooked up my newish scan tool and looked at the mode 6 data for the cam phasers. Found one was way out of spec while the engine was hot, something my old basic reader would have missed. Replaced the phaser and the truck runs smooth now. Anyone have a go-to test for phasers before you pull the valve cover?

2 comments

2 Comments

campbell.mary2d ago

That 3-degree spec from @the_emma seems pretty tight for a hot engine.

the_emma2d agoMost Upvoted

What's the spec you're looking for on the mode 6 data? I usually check for a difference over 3 degrees between the two banks.