Mercury HP 500 EFI Bravo XR/XZ/III - Engine Runs Rough, Misses, And;Or Backfires

130 500 EFI Bravo
TROUBLESHOOTING
Engine Will Not Start, or Is Hard to Start (con’t)
Lanyard Stop activated. Reset.
Clogged fuel filters. Replace filters.
Stale or contaminated fuel.
If contaminated, drain tank. Fill
with fresh fuel.
Fuel line or tank vent line
kinked or clogged.
Replace kinked lines or blow
out lines with compressed air
to remove obstruction.
Engine Runs Rough, Misses, and/or Backfires
Possible Cause Remedy
Idle speed too low.
Have adjustments checked by
an Authorized MerCruiser
Dealer.
Faulty ignition system
component.
Service ignition system.
Clogged fuel filters. Replace filters.
Stale or contaminated fuel.
If contaminated, drain tank. Fill
with fresh fuel.
Kinked or clogged fuel line or
fuel tank vent line.
Replace kinked lines or blow
out lines with compressed air
to remove obstruction.
Flame Arrestor plugged with
foreign material.
Clean Flame Arrestor.
Rev Limiter engaging at
wide-open-throttle.
Change to propeller with more
pitch.