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

Engine Will Not Start, or Is Hard to Start (con't)
Lanyard Stop activated.
Clogged fuel filters.
Stale or contaminated fuel.
Fuel line or tank vent line
kinked or clogged.

Engine Runs Rough, Misses, and/or Backfires

Possible Cause
Idle speed too low.
Faulty ignition system
component.
Clogged fuel filters.
Stale or contaminated fuel.
Kinked or clogged fuel line or
fuel tank vent line.
Flame Arrestor plugged with
foreign material.
Rev Limiter engaging at
wide-open-throttle.
130
TROUBLESHOOTING
Reset.
Replace filters.
If contaminated, drain tank. Fill
with fresh fuel.
Replace kinked lines or blow
out lines with compressed air
to remove obstruction.
Remedy
Have adjustments checked by
an Authorized MerCruiser
Dealer.
Service ignition system.
Replace filters.
If contaminated, drain tank. Fill
with fresh fuel.
Replace kinked lines or blow
out lines with compressed air
to remove obstruction.
Clean Flame Arrestor.
Change to propeller with more
pitch.
500 EFI Bravo