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My cheap OBD2 scanner kept losing the code, so I tried pulling up live data on the drive home instead, and that is how I found my misfire
A $22 scanner from a pawn shop in Reno saved me from throwing parts at a P0302 for a week straight. Anyone else skip reading freeze frame data and just guess?
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holly89810h ago
Freeze frame told me my P0304 only happened at 47 mph under light throttle, never at idle. Turned out to be a weak coil on cylinder 4 that tested fine cold. I parked it overnight at a shop with a scope and watched it break down once it got hot. That five minute scan beat the two weekends I wasted swapping plugs and wires on my old Ranger.
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