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| Home / Outboard Engines / Mercury Engines / Mercury 15 ELH |
Mercury 15 ELH Troubleshooting
| Engine doesn't start or difficult to start |
Empty gas tank - Fill fuel up.
Incorrect fuel grade - Use quality fuel.
Air in the fuel pipes - Bleed the fuel pipes.
Defective wiring connection of spark plug - Check spark plug wiring connection, repair or change.
Spark plug is defective - Change spark plug as required.
Dirty fuel filter - Fuel filter needs to be replaced.
Dirty fuel lines - Fuel lines need to be cleaned.
Drained or defective battery - Battery needs to be recharged or replaced.
Bad harness connections - Inspect harness connections.
Ignition system failure - Check ignition system components and change if necessary.
Defective pulse fuel pump - Replace pulse fuel pump.
Electric fuel pump is defective - Install new electric fuel pump.
Electronic control modul failure - Install new ECM.
| Engine starts and stops suddenly |
Spark plug is damaged - Spark plug need to be replaced.
Ignition coil is damaged - Ignition coil must be replaced.
Defective pulse fuel pump - Install new pulse fuel pump.
Restrictions in fuel system - Clean fuel system.
Final fuel filter is dirty - Replace or clean final filter.
Defective electric fuel pump - Electric fuel pump need to be replaced.
| Rough engine running |
Ignition system malfunction - Inspect ignition system and change faulty parts.
Fuel pump is damaged or dirty - Clean or replace fuel pump.
Fuel lines are clogged - Fuel lines need to be cleaned.
Fuel filter is plugged - Change fuel filter.
| Engine overheated |
Excessive engine load - Reduce the load.
Ignition timing is wrong - Set the ignition timing correctly.
Thermostat is faulty - Change thermostat.
Water pump is defective - Change water pump.
| Abnormal engine knocking or noise |
Low octane gasoline - Change gasoline.
Engine is overloaded - Reduce the load.
Low idle speed set incorrectly - Test and adjust.
Fuel pump is dirty or defective - Clean or change fuel pump.
Main bearings or crankshaft wear - Crankshaft or bearings need to be replaced.
Piston rings or cylinder bore are damaged - Replace faulty parts.
| Loss of engine power |
Clogged or damaged fuel pump - Check fuel pump and replace if necessary.
Defective ignition system - Check ignition and replace faulty components.
Powerhead parts are worn out - Replace defective components.
Stator, coil, or switch box defective - Replace faulty parts.
Compression is insufficient - Normalize compression.
Fuel supply problem - Check fuel system.
Manifold is leaking - Leak must be repaired.
Vapor separator is flooded - Normalize vapor separator functions.
| Engine uses too much fuel |
Loose or faulty spark plug - Tighten or replace spark plug.
Rings, sleeve, or piston are damaged - Replace faulty components as required.
Engine overload - Load reducing is recommended.
Fuel injectors are defective or dirty - Inspect fuel injectors and change as required.
| Trim motor is running but system can't move |
Not enough oil - Need to add the oil.
Pump assembly is defective - Check pump and replace if necessary.
Manual release valve leaking - Close the valve or change it.
Pump driveshaft or motor damaged - Replace worn component.
| Trim cannot be fully up or down |
Pump assembly faulty - Change pump as required.
Tilt ram piston ball is displaced - Service or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Oil insufficient - Fill up oil to required level.
Lower check valve not seating in port side trim ram - Secure valve properly.
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| Engines Technical Specifications |