Starter Motor Will Not Crank Engine, Or Cranks Slow; Engine Will Not Start Or Is Hard To Start; Engine Runs Rough, Misses And/Or Backfires; Poor Performance - Mercury Inboard 5.7L Manual

Troubleshooting

Starter Motor Will Not Crank Engine, Or Cranks Slow

Battery switch turned off.
Remote control not in neutral position.
Open circuit breaker or blown fuse.
Loose or dirty electrical connections or damaged
wiring.
Bad battery or low battery voltage.
Lanyard stop switch activated.

Engine Will Not Start Or Is Hard To Start

Lanyard stop switch activated.
Improper starting procedure.
Insufficient fuel supply.
Engine flooded.
Faulty ignition system component.
Clogged fuel filter.
Stale or contaminated fuel.
Fuel line or tank vent line kinked or clogged.
Faulty wire connections.
TKS fuse blown.

Engine Runs Rough, Misses And/Or Backfires

Clogged fuel filter.
Stale or contaminated fuel.
Kinked or clogged fuel line or fuel tank vent line.
Flame Arrestor dirty.
Faulty ignition system component.

Poor Performance

Throttle not fully open.
Damaged or improper propeller.
Excessive bilge water.
Boat overloaded or load improperly distributed. Reduce load or redistribute load more evenly.
Flame arrestor dirty.
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Possible Cause
Possible Cause
Possible Cause
Possible Cause
Turn the switch on.
Position the control lever in neutral.
Check and reset the circuit breaker or replace fuse.
Check all electrical connections and wires (especially
battery cables). Clean and tighten all faulty
connections.
Test the battery and charge if necessary; replace if
bad.
Check the lanyard stop switch.
Remedy
Check the lanyard stop switch.
Read the starting procedure.
Fill fuel tank or open valve.
Turn the key switch off and wait 5 minutes. Push the throttle
only button, push the remote control handle/throttle lever to the
1/4 throttle position, and attempt to restart.
Service the ignition system.
Replace fuel filter.
Drain fuel tank. Fill with fresh fuel.
Replace kinked lines or blow out lines with compressed air to
remove obstruction.
Check wire connections.
Check TKS fuse. Replace the fuse if blown.
Replace filter.
If contaminated, drain tank. Fill with fresh fuel.
Replace kinked lines or blow out lines with compressed air
to remove obstruction.
Clean Flame Arrestor.
Service ignition system.
Inspect the throttle cable and linkages for proper operation.
Replace the propeller.
Drain and check for cause of entry.
Clean the flame arrestor.
Remedy
Remedy
Remedy
90-860174050 JUNE 2005