Mercury 75 ELPT Troubleshooting
| Engine Model: Mercury 75 ELPT |
| Engine Type: 4-stroke inline 4-cylinder gasoline outboard engine |
| Total Displacement: 126 cu.in (2.1 L) |
| Rated Engine Power: 75 Hp (56 kW) at 5500 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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| Engine will not start or starts up hard |
Gas tank is empty - Fill gasoline up.
Wrong fuel grade - Change gasoline.
Water or air in fuel system - Remove air or water from system.
Spark plug wire connection are damaged - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Install new spark plug.
Fuel filter is clogged - Fuel filter needs changing.
Worn or damaged vapor separator needle valve - Replace needle valve.
Fuel lines are dirty - Fuel lines need to be cleaned.
Fuel tank air vent restricted or closed - Open or clean air vent.
Damaged fuel feed pump - Replace or rebuild fuel feed pump.
Choke cable is unadjusted or damaged - Change cable or adjust properly.
Valve clearance is wrong - Check and adjust.
Incorrect valve timing - Set the valve timing correctly.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Fuel injector is clogged or malfunction - Replace or clean if necessary.
Fuel regulator is defective - Replace fuel regulator.
ECM failure - Replace ECM.
| Engine starts and stops suddenly |
Damaged spark plug - Replace spark plug.
Vapor separator needle valve is worn or defective - Install new needle valve.
Ignition coil is faulty - Change ignition coil as required.
Fuel tank air vent restricted or closed - Open or service air vent.
Fuel pump malfunction - Install new pump or repair it.
Choke system malfunction - Inspect and replace choke system components.
Valve clearance is improper - Adjust valve clearance according to specifications.
Valve timing is incorrect - Set the valve timing correctly.
Valve springs are broken or bad - Install new valve springs.
Valves sticking - Service the valves.
Weak cylinder compression - Inspect and replace defective parts.
Dirty fuel filter - Install new filter.
Fuel injector is dirty or worn - Replace or clean as required.
Not enough engine oil - Fill the crankcase with engine oil.
Oil pump failure - Install new oil pump.
Water intake is clogged - Need to clean or wash.
Thermostat failure - Change thermostat.
Defective water pump - Change water pump as required.
Ignition failure - Test ignition and replace failed parts.
Clogged or damaged fuel pump - Inspect fuel pump and change as required.
Worn or defective vapor separator needle valve - Replace needle valve.
Dirt in the fuel lines - Clean fuel lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel filter is plugged - Fuel filter needs to be replaced.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake is clogged - Need to wash or clean.
Throttle valve and throttle link are damaged or worn - Replace faulty components.
Damaged or clogged fuel injector - Clean or replace as required.
Engine is overloaded - Load reducing required.
Fuel injector or fuel pump is dirty - Clean or replace if necessary.
Wrong ignition timing - Set the ignition timing correctly.
Defective thermostat - Change thermostat.
Defective water pump - Change water pump as required.
Propeller selection improperly - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Outboard engine is mounted too high or too low - Mount the motor as required.
Insufficient engine oil - Fill the crankcase with engine oil.
Oil pump failure - Change oil pump as required.
Water intake is clogged - Need to clean or wash.
Improper valve setting - Valves needs to be set correctly.
| Engine knocking sound or abnormal noise |
Low octane gasoline - Change fuel.
Engine is running overloaded - Reduce the load.
Wrong adjustment of low idle speed - Correct idle settings.
Clogged or damaged fuel pump - Inspect fuel pump and change as required.
Main bearings or crankshaft are worn out - Crankshaft or bearings need to be replaced.
Damaged piston rings or cylinder bore - Change defective components.
Dirt in the fuel lines - Service fuel lines.
Faulty fuel injector - Change fuel injector.
Fuel pump is damaged or dirty - Check fuel pump and replace if necessary.
Defective ignition system - Inspect ignition system and change faulty parts.
Defective cylinder head gasket - Install new head gasket.
Damaged powerhead parts - Replace defective components.
Valves are stuck or burned - Clean or replace valves.
Propeller selection improperly - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Check the outboard engine mounting height.
Trim angle is incorrect - Adjust trim angle.
Damaged or clogged fuel injector - Replace or clean as required.
Loose or defective spark plug - Change or re-tighten spark plug.
Worn rings, piston, or sleeve - Replace faulty components.
ECU is faulty - Replace ECU.
| Excessive engine vibration |
Damaged or improper size of propeller - Replace propeller.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds clogs the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten bolt.
Steering pivot is faulty or loose Tighten or replace.
| Starter motor is not working |
Low battery capacity - Battery needs to be recharged.
Battery won’t hold charge - Service battery or replace it.
Wires are disconnected or battery terminals are corroded - Connect cables correctly or replace terminals.
Defective starter motor - Repair or change starter.
| Trim motor is running but trim system cannot move up or down |
Not enough oil - Need to add the oil.
Defective pump assembly - Check pump and change if required.
Manual release valve leaking - Valve need to be closed or changed.
Motor or pump driveshaft faulty - Change defective component.
| Trim does not fully up or down |
Pump assembly is defective - Change pump as required.
Tilt ram piston ball is in wrong position - Clean or repair.
Worn tilt ram piston O-ring - Change O-ring.
Not enough oil - Check and refill oil.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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