Spent 6 hours hunting a no-start on my $900 Civic and it was a $4 ground strap
I chased spark, fuel, and a new main relay in my driveway in Tucson before I finally found the corroded ground bolt behind the thermostat housing. What dumb little thing has eaten a full day of your wrenching time?
It's always the cheap dumb stuff too. Same thing happens with house repairs, you tear apart the whole bathroom looking for a leak and it's a 50 cent gasket. We're wired to expect the fix to match the size of the headache, so we skip right past the simple answer. Six hours for a $4 part is the most expensive cheap repair there is.