Mercury Verado 450R Troubleshooting
| Engine Model: Mercury Verado 450R |
| Engine Type: 4-stroke 8-cylinder DOHC 32-valve supercharged gasoline outboard engine |
| Total Displacement: 279 cu.in (4.6 L) |
| Rated Engine Power: 450 Hp (334 kW) at 6400 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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| Engine won't start or hard to start |
Empty gas tank - Add fuel.
Low-quality gasoline - Use correct gasoline grade.
Air in fuel tank - Bleed fuel tank.
Spark plug wire is disconnected or loose - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Change spark plug as required.
Fuel filter is clogged - Fuel filter needs to be replaced.
Worn or damaged vapor separator needle valve - Install new needle valve.
Dirty fuel lines - Clean fuel lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel feed pump malfunction - Fuel feed pump need to be replaced.
Choke cable is unadjusted or damaged - Adjust properly or change the cable.
Valve clearance is not correct - Check and adjust.
Valve timing is improper - Adjust valve timing correctly.
Low fuel pressure - Inspect fuel system for leaks or inspect low pressure fuel pump.
Dirty or faulty fuel injector - Clean or replace if necessary.
Fuel regulator is faulty - Change fuel regulator.
ECM is not functioning - Replace ECM.
| Engine starts but then shuts off |
Defective spark plug - Install new spark plug.
Worn or damaged vapor separator needle valve - Install new needle valve.
Faulty ignition coil - Ignition coil should be replaced.
Fuel tank air vent clogged or closed - Open or service air vent.
Fuel pump defective - Replace or rebuild fuel pump.
Choke system is damaged - Check and repair choke system.
Valve clearance is incorrect - Adjustment procedure required.
Valve timing is improper - Set the valve timing properly.
Weak or damaged valve springs - Install new valve springs.
Valves sticking - Service the valves.
Poor compression - Check and replace worn parts.
Fuel filter is dirty - Change fuel filter.
Dirty or faulty fuel injector - Clean or replace if necessary.
Engine oil level low - Need to add engine oil.
Oil pump failure - Change oil pump as required.
Clogged water intake - Wash or clean as required.
Damaged thermostat - Replace thermostat.
Water pump failure - Install new water pump.
Ignition system failure - Check ignition system and replace faulty parts.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Damaged or wear vapor separator needle valve - Install new needle valve.
Fuel lines are clogged - Service fuel lines.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Fuel filter is plugged - Fuel filter needs changing.
Intake manifold is air leaking - Install new gasket.
Dirty water intake screen - Clean and wash as required.
Throttle link and throttle valve are worn or damaged - Replace faulty parts.
Clogged or worn fuel injector - Replace or clean as required.
Excessive engine load - Reduce the load.
Fuel injector or fuel pump is clogged - Clean or replace if necessary.
Incorrect ignition timing - Adjust ignition timing as required.
Thermostat is defective - Thermostat need to be replaced.
Defective water pump - Change water pump as required.
Propeller selection improperly - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine is mounted too high or too low - Position the engine correctly.
Lack of engine oil - Add oil to the engine crankcase.
Defective oil pump - Oil pump need to be replaced.
Water intake is blocked - Need to clean or wash.
Valve setting is improper - Adjust valves as required.
Low octane gasoline - Use proper gasoline.
Excessive engine load - Load reducing required.
Low idle speed setting is not correct - Correct idle adjustment.
Clogged or damaged fuel pump - Test fuel pump and change if necessary.
Crankshaft or main bearings are worn out - Have bearings or crankshaft replaced.
Damaged cylinder bore or piston rings - Replace defective components.
Fuel lines clogging - Clean fuel lines.
Fuel injector is fault - Test fuel injector and replace if necessary.
Clogged or damaged fuel pump - Check fuel pump and replace if necessary.
Defective ignition system - Inspect ignition system and change faulty parts.
Damaged cylinder head gasket - Install new cylinder head gasket.
Powerhead components are worn - Defective parts need to be replaced.
Valves are stuck or burned - Clean or replace valves.
Incorrect propeller selection - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard motor mounting height is set incorrectly - Adjust the engine to correct transom height.
Improper trim angle - Adjust trim angle correctly.
| Engine uses too much fuel |
Fuel injector is faulty or clogged - Clean or replace as required.
Spark plug is loose or defective - Tighten or replace spark plug.
Worn sleeve, rings, or piston - Change defective parts.
Electronic control unit failure - Change electronic control unit.
| Excessive engine vibration |
Damaged or improper size of propeller - Have propeller repaired or replaced.
Propeller shaft damaged - Replace propeller shaft.
Weeds in the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is loose or damaged Tighten correctly or replace.
Low battery capacity - Low battery charging, charge as required.
Battery will not hold charge - Battery needs service or replacement.
Terminals are faulty or battery cables are disconnected - Check battery wires and service or replace terminals.
Faulty starter motor - Starter should be changed.
| Trim motor runs but trim system does not move up or down |
Oil insufficient - Checking oil level and add if necessary.
Pump assembly is damaged - Test pump and change if necessary.
Leakage of manual release valve - Close the valve fully or replace it.
Broken motor or pump driveshaft - Replace worn component.
| Trim cannot be fully up or down |
Pump assembly is faulty - Replace pump.
Tilt ram piston ball is not positioned correctly - Service or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Low oil level - Check oil level and add oil as required.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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