98
CD819
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.
Cracked, kinked or clogged fuel line or fuel tank vent
line
Replace line, or remove line and blow out line with
compressed air to remove obstruction.
Air in fuel injection system Purge fuel injection system.
Injector / injector nozzle malfunction Have inspected by an Authorized Mercury
MerCruiser Dealer.
Injection pump governor malfunction Have inspected by an Authorized Mercury
MerCruiser Dealer.
CD820
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 distributed Reduce load or redistribute load more evenly.
Boat bottom fouled or damaged Clean or repair as necessary.
Air in fuel injection system Purge fuel injection system.
Clogged fuel or air filters Replace filters.
Fuel leakage from overflow valve Have inspected by an Authorized Mercury
MerCruiser Dealer.
Incorrect valve clearance adjustment. Inspect and adjust valve clearance.
Deteriorated injection pump governor spring Have inspected by an Authorized Mercury
MerCruiser Dealer.
Uneven fuel injection amount between plungers. Have inspected by an Authorized Mercury
MerCruiser Dealer.
Cylinder compression pressure leakage Have inspected by an Authorized Mercury
MerCruiser Dealer.
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