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| Home / Outboard Engines / Mercury Engines / Mercury 60 EFI |
Mercury 60 EFI Troubleshooting
| Engine won't start or difficult to start |
Empty fuel tank - Fill gasoline up.
Improper fuel grade - Use correct fuel grade.
Air in fuel tank - Bleed fuel tank.
Faulty spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Faulty spark plug - Spark plug need to be replaced.
Fuel filter is clogged - Replace or clean fuel filter.
Dirt in the fuel lines - Fuel lines need to be cleaned.
Discharged or defective battery - Recharge or change battery.
Wiring harness connections are damaged - Check electrical wire harness connections.
Ignition system failure - Replace defective components.
Defective pulse fuel pump - Pulse fuel pump need to be replaced.
Electric fuel pump failure - Replace electric fuel pump.
ECM failure - Replace ECM.
| Engine stops after starting |
Faulty spark plug - Install new spark plug.
Damaged ignition coil - Ignition coil should be replaced.
Pulse fuel pump is faulty - Change pulse fuel pump as required.
Fuel system is clogged - Fuel system need to be cleaned.
Dirty final fuel filter - Final filter needs to be replaced.
Electric fuel pump failure - Electric fuel pump need to be replaced.
| Rough engine running |
Ignition system malfunction - Check ignition system and replace faulty parts.
Fuel pump is faulty or clogged - Check fuel pump and replace if necessary.
Fuel lines are dirty - Fuel lines need to be cleaned.
Clogged fuel filter - Install new filter.
| Engine keeps overheating |
Engine overload - Reduce load.
Ignition timing is improper - Ignition timing needs to be set properly.
Faulty thermostat - Change thermostat as required.
Damaged water pump - Water pump need to be replaced.
| Abnormal engine knocking or noise |
Low octane fuel - Use proper fuel.
Engine overload - Reduce load.
Too low idle RPM - Test and adjust.
Dirty or faulty fuel pump - Check fuel pump and change if required.
Main bearings or crankshaft failure - Worn parts replacement required.
Piston rings or cylinder bore are damaged - Replace faulty parts.
| Engine power is too low |
Fuel pump is clogged or faulty - Service or replace fuel pump.
Ignition system malfunction - Inspect ignition system and change failed components.
Powerhead parts are faulty - Change defective parts.
Stator, coil, or switch box defective - Replace damaged components.
Compression is insufficient - Correct.
Fuel supply problem - Check fuel system.
Manifold is leaking - Leak must be repaired.
Vapor separator is flooded - Check and correct malfunction.
| Engine using too much gasoline |
Faulty or loose spark plug - Spark plug need to be replaced or tightened.
Worn piston, rings, or sleeve - Replace faulty parts.
Engine is overloaded - Load reducing is recommended.
Dirty or damaged fuel injectors - Clean or change fuel injectors.
| Trim motor is running but system can't move |
Oil level is low - Check and refill oil.
Pump assembly is defective - Check pump and change if required.
Manual shut-off valve leaks - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Replace worn component.
| Trim does not fully up or down |
Pump assembly is defective - Change pump.
Tilt ram piston ball is displaced - Clean or repair.
Worn tilt ram piston O-ring - Change O-ring.
Insufficient oil - Check and refill oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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