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CH25
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.
Ignition System fault. 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.
Have EFI System checked by an Authorized
Mercury MerCruiser Dealer.
Low on fuel. Fill tank.
Engine timing off. Check timing.
CH47
Poor Performance
Possible Cause Remedy
Throttle not fully open.
Inspect throttle cable and linkages for proper
operation.
Damaged or improper propeller. Replace propeller.
Excessive bilge water. Drain and check for cause of entry.
Boat overloaded or load improperly distributed. Reduce load or redistribute load more evenly.
Boat bottom fouled or damaged. Clean or repair as necessary.
Flame Arrestor dirty. Clean Flame Arrestor.
Ignition Problem See Engine Runs Rough, Misses or Backfires.
Engine overheating. See Excessive Engine Temperature.
EFI System fault (If Equipped).
Have EFI System checked by an Authorized
Mercury MerCruiser Dealer.
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