166
CA900
Engine Runs Rough, Misses And/Or Backfires
Possible Cause Remedy
Idle speed too low.
EFI Models: Have EFI system
checked by an Authorized
Mercury MerCruiser Dealer.
Choke not operating properly.
Carburetor Models: Check
choke linkages for binding or
an obstruction.
Faulty ignition system
component.
Service ignition system.
Clogged fuel filter. Replace filter.
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.
EFI System fault (If Equipped). Have EFI System checked.
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