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| Home / Outboard Engines / Mercury Engines / Mercury 150 EFI |
Mercury EFI 150 Troubleshooting
| Engine Model: Mercury EFI 150 Hp |
| Engine Type: 2-cycle 6-cylinder gasoline outboard engine |
| Total Displacement: 153 cu.in (2507 cc) |
| Rated Engine Power: 150 Hp (111.8 kW) at 5750 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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- Mercury 150 EFI Engine Specifications
- Mercury 150 EFI Engine Maintenance
- Mercury 150 EFI Engine Troubleshooting
| Engine hard starting or not starting |
Empty fuel tank - Fill fuel up.
Low-quality gasoline - Change fuel.
Clogged fuel system - Remove clogging.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Spark plug is damaged - Spark plug need to be replaced.
Fuel filter is clogged - Fuel filter needs changing.
Dirty fuel lines - Clean fuel system lines.
Drained or defective battery - Recharge or replace battery.
Damaged electrical wire harness - Check wiring harness connections.
Ignition system is damaged - Change defective parts.
Pulse fuel pump is defective - Change pulse fuel pump as required.
Electric fuel pump failure - Change electric fuel pump as required.
ECM failure - Replace ECM.
| Engine starts but then shuts off |
Damaged spark plug - Spark plug need to be replaced.
Damaged ignition coil - Install a new ignition coil.
Defective pulse fuel pump - Change pulse fuel pump.
Fuel system is clogged - Service fuel system.
Final fuel filter is plugged - Replace or clean final filter.
Defective electric fuel pump - Change electric fuel pump as required.
| Irregular engine running |
Defective ignition system - Inspect ignition system and change failed components.
Clogged or defective fuel pump - Clean or replace fuel pump.
Fuel lines are clogged - Fuel lines need to be cleaned.
Dirty fuel filter - Replace fuel filter.
| Engine overheats |
Excessive engine load - Reduce engine load.
Incorrect ignition timing - Set the ignition timing properly.
Defective thermostat - Thermostat need to be replaced.
Water pump malfunction - Replace water pump.
| Engine knocking or noise |
Stale gasoline - Use proper gasoline.
Excessive engine load - Reduce the load.
Low idle speed setting is incorrect - Adjustment required.
Fuel pump is damaged or dirty - Check fuel pump and change if required.
Main bearings or crankshaft failure - Need to install new components.
Cylinder bore or piston rings are damaged - Replace faulty parts.
| Low engine power |
Dirty or damaged fuel pump - Check fuel pump and replace if necessary.
Ignition system problems - Check ignition system and replace faulty parts.
Worn powerhead components - Replace defective parts as required.
Failed switch box, stator, or coil - Replace faulty parts.
Bad compression - Normalize compression.
Fuel delivery problem - Check and repair.
Manifold fuel leak - Leak must be repaired.
Vapor separator is flooded - Normalize vapor separator functions.
| Engine uses too much fuel |
Spark plug is faulty or loose - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Change defective parts.
Excessive engine load - Reduce the load.
Dirty or defective fuel injectors - Clean or replace fuel injectors.
| Trim motor is running but system can't move |
Oil level is low - Fill up oil to required level.
Pump assembly faulty - Inspect pump and change as required.
Manual release valve leaking - Valve need to be closed or changed.
Pump driveshaft or motor damaged - Change defective component.
| Trim does not fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Low oil level - Fill up oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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| Engines Technical Specifications |