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Engine Runs Rough, Misses And/Or Backfires
Possible Cause Remedy
• Throttle not operating properly • Check throttle linkages for binding or an obstruction.
• Idle speed too low • Check idle speed and adjust, if necessary.
• Clogged fuel or air 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 line or blow out line with com-
pressed air to remove obstruction.
• Air in fuel injection system • Purge fuel injection system.
• EDI System fault.
• Have EDI System checked by an Authorized
MerCruiser Dealer.
Poor Performance
Possible Cause Remedy
• Throttle not fully open • Inspect throttle cable and linkages for operation.
• Damaged or improper propeller • Replace.
• Excessive bilge water • Drain and check for cause of entry.
• Boat overloaded or load improperly dis-
tributed
• Reduce load or redistribute load more evenly.
• Boat bottom fouled or damaged • Clean or repair as necessary.
• EDI System fault.
• Have EDI System checked by an Authorized
MerCruiser Dealer.
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