Mercury 9.9 ELHPT Troubleshooting
| Engine Model: Mercury 9.9ELHPT |
| Engine Type: 4-stroke 2-cylinder SOHC gasoline outboard engine |
| Total Displacement: 12.8 cu.in (209 cc) |
| Rated Engine Power: 9.9 Hp (7.3 kW) at 6200 rpm |
| Fuel System: Electronic fuel fnjection (EFI) |
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| Engine starts up hard or doesn't start |
No gasoline in tank - Add gasoline.
Improper fuel grade - Use correct gasoline grade.
Water or air in fuel system - Remove air or water from system.
Spark plug wire is disconnected or loose - Check spark plug wiring connection, repair or change.
Defective spark plug - Change spark plug.
Plugged fuel filter - Fuel filter needs to be replaced.
Worn or defective vapor separator needle valve - Replace needle valve.
Restricted fuel lines - Clean fuel system lines.
Closed or restricted fuel tank air vent - Open or service air vent.
Fuel feed pump failure - Repair or change fuel feed pump.
Improperly adjusted or worn throttle cable - Adjust correctly or change the cable.
Valve clearance is not correct - Adjustment procedure required.
Valve timing is improper - Set the valve timing properly.
Low fuel pressure - Check low pressure fuel pump or check system for fuel leaks.
Fuel injector is clogged or malfunction - Clean or replace as required.
Fuel regulator is defective - Install new fuel regulator.
ECM failure - Replace ECM.
| Engine starts but stops suddenly |
Damaged spark plug - Install new spark plug.
Damaged or wear vapor separator needle valve - Change vapor separator needle valve.
Ignition coil is faulty - Ignition coil should be replaced.
Fuel tank air vent clogged or closed - Open or service air vent.
Faulty fuel pump - Install new pump or repair it.
Choke system malfunction - Change choke system components as required.
Valve clearance is improper - Adjustment procedure required.
Wrong valve timing - Adjust valve timing as required.
Valve springs are loose or broken - Install new valve springs.
Valves sticking - Service the valves.
Low compression - Check and repair damaged parts.
Fuel filter is plugged - Replace fuel filter.
Damaged or clogged fuel injector - Replace or clean if necessary.
Not enough engine oil - Checking oil level and add if necessary.
Defective oil pump - Install new oil pump.
Water intake screen is dirty - Need to wash or clean.
Defective thermostat - Replace thermostat.
Water pump failure - Change water pump as required.
Ignition failure - Test ignition and replace failed parts.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Damaged or wear vapor separator needle valve - Replace needle valve.
Fuel lines clogging - Fuel lines need to be cleaned.
Fuel tank air vent closed or restricted - Open or service air vent.
Fuel filter is plugged - Fuel filter needs to be replaced.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake is blocked - Need to clean or wash.
Throttle link and throttle valve are wear or damaged - Replace faulty parts.
Damaged or clogged fuel injector - Replace or clean if necessary.
Engine is under excessive load - Reduce engine load.
Fuel injector or fuel pump is clogged - Clean or replace as required.
Improper ignition timing - Set the ignition timing correctly.
Thermostat failure - Install new thermostat.
Water pump failure - Install new water pump.
Propeller pitch or diameter incorrect - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Lack of engine oil - Checking oil level and add if necessary.
Faulty oil pump - Replace oil pump.
Dirty water intake screen - Clean and wash as required.
Incorrect valve setting - Valves needs to be set correctly.
| Abnormal engine knocking or noise |
Low octane fuel - Use proper gasoline.
Excessive engine load - Reduce load.
Low idle speed setting is incorrect - Adjust idle speed.
Clogged or damaged fuel pump - Check fuel pump and change if required.
Crankshaft or main bearings are worn out - Change or repair worn components.
Cylinder bore or piston rings are worn - Change defective parts.
Fuel lines are dirty - Service fuel lines.
Fuel injector malfunction - Inspect fuel injector and change as required.
Dirty or defective fuel pump - Service or change fuel pump.
Defective ignition system - Check ignition and replace faulty components.
Defective cylinder head gasket - Replace the head gasket.
Damaged powerhead components - Change defective components.
Valves are burned or stuck - Replace or service valves.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Engine mounted at wrong transom height - Have motor adjusted to proper transom height.
Trim angle is incorrect - Make the correct trim angle adjustment.
| Engine using too much gasoline |
Fuel injector is dirty or worn - Clean or install new injector.
Loose or defective spark plug - Spark plug need to be tightened or replaced.
Worn rings, piston, or sleeve - Change defective parts.
ECU is faulty - Change electronic control unit.
| Excessive motor vibration |
Damaged or bent propeller - Have propeller repaired or replaced.
Propeller shaft malfunction - Replace propeller shaft.
Weeds clogs the propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Loose or faulty steering pivot Tighten or replace.
Low battery output - Recharge the battery.
Battery is not holding charge - Service or replace the battery.
Disconnected battery cables or bad terminals - Check cables and service or change terminals.
Starter motor is faulty - Starter needs to be replaced.
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