Section 7 - Troubleshooting
90-8M0050539
eng
MAY 2011
Page 151
Engine Runs Rough, Misses, or Backfires
Possible Cause
Remedy
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 dirty.
Clean Flame Arrestor.
Faulty ignition system component.
Service ignition system.
Idle speed too low.
Have EFI system checked by an authorized Mercury MerCruiser dealer.
EFI System fault.
Have EFI System checked by an authorized Mercury MerCruiser dealer.
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
.
EFI System fault
Have EFI System checked by an authorized Mercury MerCruiser dealer.
Excessive Engine Temperature
Possible Cause
Remedy
Water inlet or seacock closed.
Open.
Drive belt loose or in poor condition.
Replace or adjust belt.
Seawater pickups or sea strainer obstructed.
Remove obstruction.
Faulty thermostat.
Replace.
Coolant level (if equipped) low in closed cooling section.
Check for cause of low coolant level and repair. Fill system with
proper coolant solution.
Heat Exchanger or Fluid Cooler plugged with foreign material Clean Heat Exchanger, Engine Oil Cooler, and Transmission
Oil Cooler (if equipped).
Loss of pressure in closed cooling section.
Check for leaks. Clean, inspect and test pressure cap.
Faulty seawater pickup pump.
Repair.
Seawater discharge restricted or plugged.
Clean exhaust elbows.
Insufficient Engine Temperature
Possible Cause
Remedy
Faulty thermostat.
Replace.
Summary of Contents for MerCruiser Axius SeaCore 350 MAG
Page 28: ...Section 1 Warranty Notes Page 20 90 8M0050539 eng MAY 2011...
Page 56: ...Section 2 Getting to Know Your Power Package Notes Page 48 90 8M0050539 eng MAY 2011...
Page 70: ...Section 3 On the Water Notes Page 62 90 8M0050539 eng MAY 2011...
Page 162: ...Section 7 Troubleshooting Notes Page 154 90 8M0050539 eng MAY 2011...
