Mercury 150 Verado Troubleshooting
| Engine Model: Mercury Verado 150 |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 106 cu.in (1.7 L) |
| Rated Engine Power: 150 Hp (110.3 kW) at 6400 rpm |
| Fuel System: Sequential multi-point electronic fuel injection (EFI) |
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| Engine starts hard or won't start |
Fuel tank is empty - Add gasoline.
Wrong fuel grade - Use correct gasoline grade.
Air in the fuel lines - Bleed the fuel lines.
Defective wiring connection of spark plug - Check spark plug wiring connection, repair or change.
Spark plug is faulty - Install new spark plug.
Plugged fuel filter - Change fuel filter.
Vapor separator needle valve is worn or defective - Replace needle valve.
Fuel lines clogging - Fuel lines need to be cleaned.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel feed pump malfunction - Replace or repair fuel pump.
Incorrectly adjusted or damaged throttle cable - Change cable or adjust correctly.
Valve clearance is not correct - Adjustment procedure required.
Improper valve timing - Set the valve timing properly.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Fuel injector is clogged or malfunction - Replace or clean as required.
Fuel regulator is not operating - Install new fuel regulator.
ECM is not functioning - Change electronic control modul.
| Engine starts but then stalls |
Spark plug is defective - Change spark plug as required.
Vapor separator needle valve is worn or defective - Change vapor separator needle valve.
Defective ignition coil - Ignition coil must be replaced.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump defective - Install new pump or repair it.
Damaged choke system - Inspect and replace choke system components.
Excessive valve clearance - Adjust to proper valve clearance.
Improper valve timing - Set the valve timing properly.
Valve springs are loose or broken - Valve springs need to be changed.
Valves are stuck - Clean the valves.
Poor cylinder compression - Check and repair damaged parts.
Plugged fuel filter - Replace fuel filter.
Fuel injector is damaged or dirty - Clean or replace if necessary.
Engine oil level is insufficient - Fill up the engine oil.
Defective oil pump - Change oil pump as required.
Water intake is blocked - Need to clean or wash.
Defective thermostat - Thermostat need to be replaced.
Damaged water pump - Change water pump as required.
Defective ignition system - Check ignition and replace faulty components.
Fuel pump is faulty or clogged - Clean or replace fuel pump.
Vapor separator needle valve is worn or defective - Change vapor separator needle valve.
Fuel lines clogging - Clean fuel lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Plugged fuel filter - Replace or clean fuel filter.
Intake manifold is air leaking - Install new gasket.
Water intake is blocked - Need to clean or wash.
Throttle link and throttle valve are worn or damaged - Change faulty components.
Damaged or clogged fuel injector - Replace or clean as required.
Engine is overloaded - Reduce engine load.
Fuel injector or fuel pump is dirty - Replace or clean if necessary.
Bad ignition timing - Adjust ignition timing correctly.
Damaged thermostat - Thermostat need to be replaced.
Water pump malfunction - Change water pump.
Incorrect propeller selection - Replace propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard motor is mounted too high or too low - Position the engine correctly.
Not enough engine oil - Checking oil level and add if necessary.
Faulty oil pump - Replace oil pump.
Dirty water intake screen - Wash or clean as required.
Valve setting is incorrect - Set the valves properly.
Low octane gasoline - Change gasoline.
Excessive engine load - Load reducing required.
Improperly adjusted low idle speed - Need to adjust idle speed.
Dirty or damaged fuel pump - Clean or change fuel pump.
Crankshaft or main bearings wear - Change or repair worn components.
Piston rings or cylinder bore are damaged - Change defective parts.
Clogged fuel lines - Clean fuel system lines.
Fuel injector failure - Check fuel injector and replace if necessary.
Dirty or faulty fuel pump - Test fuel pump and replace if necessary.
Defective ignition system - Test ignition and replace failed parts.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Powerhead components are worn - Defective components need to be replaced.
Stuck or burned valves - Service or replace valves.
Propeller selection improperly - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Motor mounted at incorrect height on transom - Check the outboard engine mounting height.
Trim angle is incorrect - Adjust trim angle correctly.
| Engine uses too much fuel |
Fuel injector is faulty or clogged - Replace or clean as required.
Defective or loose spark plug - Replace or tighten spark plug.
Worn sleeve, rings, or piston - Replace faulty components as required.
ECU is not functioning - Change electronic control unit.
| Motor vibrates excessively |
Damaged or bent propeller - Replace propeller.
Propeller shaft damaged - Have propeller shaft replaced.
Weeds clogs the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Steering pivot is loose or damaged Tighten or replace.
| Starter motor is not working |
Low battery voltage - Low battery charging, charge as required.
Battery runs out quickly - Service charging system or install new battery.
Bad terminals or disconnected battery cables - Check cable connections and replace or service terminals.
Faulty starter motor - Starter needs to be changed.
| Trim motor is running but trim system cannot move up or down |
Oil insufficient - Need to add the oil.
Pump assembly is defective - Inspect pump and change as required.
Manual release valve leaking - Close the valve fully or replace it.
Motor or pump driveshaft faulty - Replace worn component.
| Trim cannot be fully up or down |
Pump assembly is damaged - Replace pump.
Tilt ram piston ball is not positioned correctly - Service or repair.
Tilt ram piston O-ring damaged - Install new O-ring.
Insufficient oil - Check oil level and add oil as required.
Lower check valve not seating in port side trim ram - Secure valve properly.
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