Mercury 4.3 TKS series User Manual

Section 6 - Troubleshooting
Page 86 90-8M0113857 eng DECEMBER 2015
Starter Motor Will Not Crank Engine, or Cranks Slow
Possible Cause Remedy
Battery switch turned off. Turn the switch on.
Remote control not in the neutral position. Position the control lever in neutral.
Open circuit breaker or blown fuse. Check and reset the circuit breaker or replace fuse.
Loose or dirty electrical connections or damaged
wiring.
Check all electrical connections and wires (especially battery cables).
Clean and tighten all faulty connections.
Bad battery or low battery voltage. Test the battery and charge if necessary; replace if bad.
Lanyard stop switch activated. Check the lanyard stop switch.
Engine Will Not Start or Is Hard to Start
Possible Cause
Remedy
Lanyard stop switch activated. Check the lanyard stop switch.
Improper starting procedure. Read the starting procedure.
Insufficient fuel supply. Fill fuel tank or open valve.
Engine flooded.
Turn the key switch off and wait five minutes. Push the throttle only button, push
the remote control handle/throttle lever to the 1/4 throttle position, and attempt to
restart.
Faulty ignition system component. Service the ignition system.
Clogged fuel filter. Replace fuel filter.
Stale or contaminated fuel. Drain fuel tank. Fill with fresh fuel.
Fuel line or tank vent line kinked or clogged.
Replace kinked lines or blow out lines with compressed air to remove
obstruction.
Faulty wire connections. Check wire connections.
TKS fuse blown. Check TKS fuse. Replace the fuse if blown.
Engine Runs Rough, Misses, or Backfires
Possible Cause Remedy
Clogged fuel filter. Replace filter.
Stale or contaminated fuel. Drain fuel 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 dirty. Clean flame arrestor.
Faulty ignition system component. Service ignition system.
Poor Performance
Possible Cause
Remedy
Throttle not fully open. Inspect the throttle cable and linkages for proper operation.
Damaged or improper propeller. Replace the propeller.
Excessive bilge water. Drain and check for cause of entry.
Boat overloaded or load improperly distributed. Reduce load or redistribute load more evenly.
Flame arrestor dirty. Clean the flame arrestor.
Boat bottom fouled or damaged. Clean or repair as necessary.
Ignition problem.
See Engine Runs Rough, Misses, or Backfires.
Engine overheating.
See Excessive Engine Temperature.
Running rich. Have authorized Mercury MerCruiser dealer check and repair.

Mercury 4.3 TKS series Specifications

General

Brand	Mercury
Model	4.3 TKS series
Category	Engine
Language	English