Random Misfire troubleshooting
I don't usually see P1133 called that - it's about
insufficient sensor switching and the cause is not so
often an actual fueling shift, as sensor aging or
sensor environment (here, the long tubes are making
it too hard for the heater to keep the element at
working temp).
The misfires could simply be following a poor-mixture
raggedy running. They also come up when you have
lightweight torque converter or flywheel/clutch, that
let the crank shake more, or are aggressively cammed
(-making- it shake more). Usually about the time you
go down these paths, it's time to turn off misfire
detection (though simply raising the bar until it quits
bitching, for now, could leave warning ability for
something worse happening in place)
insufficient sensor switching and the cause is not so
often an actual fueling shift, as sensor aging or
sensor environment (here, the long tubes are making
it too hard for the heater to keep the element at
working temp).
The misfires could simply be following a poor-mixture
raggedy running. They also come up when you have
lightweight torque converter or flywheel/clutch, that
let the crank shake more, or are aggressively cammed
(-making- it shake more). Usually about the time you
go down these paths, it's time to turn off misfire
detection (though simply raising the bar until it quits
bitching, for now, could leave warning ability for
something worse happening in place)
