Mercury 350 V10 Verado Problems
| Engine Model: Mercury Verado 350 V10 |
| Engine Type: 4-stroke 10-cylinder DOHC 40-valve gasoline outboard engine |
| Total Displacement: 349 cu.in (5.7 L) |
| Rated Engine Power: 350 Hp (257 kW) at 6400 rpm |
| Fuel System: Electronic Fuel Injection (EFI) |
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| Engine doesn't start or difficult to start |
Empty gas tank - Fill fuel up.
Incorrect fuel grade - Change fuel.
Clogged fuel system - Remove clogging.
Disconnected or loose spark plug wire - Inspect spark plug wiring connection, change or repair.
Spark plug is damaged - Change spark plug as required.
Dirty fuel filter - Fuel filter needs changing.
Worn or damaged vapor separator needle valve - Install new needle valve.
Fuel lines are clogged - Clean fuel lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Defective fuel feed pump - Install new feed pump or repair it.
Improperly adjusted or worn throttle cable - Replace cable or adjust properly.
Valve clearance is wrong - Adjust to proper valve clearance.
Valve timing is incorrect - Set the valve timing properly.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is faulty or clogged - Clean or install new injector.
Fuel regulator failure - Change fuel regulator.
Electronic control modul failure - Install new ECM.
| Engine starts but stalls immediately |
Faulty spark plug - Spark plug need to be replaced.
Damaged or wear vapor separator needle valve - Replace needle valve.
Ignition coil is faulty - Ignition coil must be replaced.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump defective - Replace or rebuild fuel pump.
Choke system is damaged - Inspect and replace choke system components.
Valve clearance is not correct - Adjustment procedure required.
Valve timing is improper - Set the valve timing properly.
Loose or broken valve springs - Replace valve springs.
Valves sticking - Clean the valves.
Low compression - Check and replace worn parts.
Plugged fuel filter - Replace fuel filter.
Dirty or faulty fuel injector - Replace or clean if necessary.
Lack of engine oil - Fill up the engine oil.
Faulty oil pump - Install new oil pump.
Water intake is clogged - Wash or clean as required.
Faulty thermostat - Replace thermostat.
Damaged water pump - Water pump need to be replaced.
| Engine runs intermittently |
Defective ignition system - Check ignition and replace faulty components.
Dirty or faulty fuel pump - Service or replace fuel pump.
Vapor separator needle valve is damaged or worn - Replace needle valve.
Fuel lines clogging - Fuel lines need to be cleaned.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel filter is dirty - Change fuel filter.
Intake manifold is air leaking - Install new gasket.
Water intake screen is dirty - Wash or clean as required.
Throttle valve and throttle link are defective or worn - Replace faulty components.
Fuel injector is damaged or dirty - Clean or install new injector.
Excessive engine load - Reduce engine load.
Clogged fuel pump or fuel injector - Clean or replace if necessary.
Improper ignition timing - Ignition timing needs to be adjusted correctly.
Damaged thermostat - Change thermostat.
Water pump is defective - Water pump need to be replaced.
Improper propeller diameter or pitch - Replace propeller.
Damaged or bent propeller - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Lack of engine oil - Fill up the oil to required level.
Defective oil pump - Change oil pump.
Water intake screen is dirty - Wash or clean as required.
Valve setting is wrong - Set the valves correctly.
Low octane fuel - Use correct gasoline.
Engine is under excessive load - Load reducing required.
Improperly adjusted low idle speed - Adjustment required.
Clogged or defective fuel pump - Service or replace fuel pump.
Worn crankshaft or main bearings - Change or repair worn components.
Piston rings or cylinder bore are worn - Replace faulty parts.
Fuel lines clogging - Clean fuel system lines.
Fuel injector is damaged - Change fuel injector.
Clogged or damaged fuel pump - Check fuel pump and change if required.
Ignition system malfunction - Check ignition system and replace faulty parts.
Cylinder head gasket is damaged - Install new head gasket.
Faulty powerhead parts - Change defective components.
Burned or stuck valves - Clean or replace valves.
Improper propeller diameter or pitch - Replace propeller.
Damaged or bent propeller - Replace propeller.
Engine mounted at wrong transom height - Adjust the engine to correct transom height.
Improper trim angle - Adjust trim angle.
| Engine uses too much fuel |
Fuel injector is dirty or worn - Replace or clean as required.
Spark plug is defective or loose - Tighten or change the spark plug.
Sleeve, rings, or piston are damaged - Replace faulty components as required.
Electronic control unit is not operating - Change electronic control unit.
| Engine vibrates excessively |
Propeller bent or damaged - Replace propeller.
Propeller shaft damaged - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
Battery power is low - Battery is drained, recharge it.
Battery discharges quickly - Service charging system or replace battery.
Disconnected cables or faulty battery terminals - Connect cables correctly or replace terminals.
Starter motor is faulty - Starter needs to be replaced.
| Trim motor is running but trim system cannot move up or down |
Oil level low - Check and refill oil.
Defective pump assembly - Test pump and change if necessary.
Leakage of manual release valve - Close the valve or change it.
Broken motor or pump driveshaft - Change defective component.
| Trim does not fully up or down |
Damaged pump assembly - Change pump.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Tilt ram piston O-ring damaged - Replace O-ring.
Oil level is insufficient - Need to add the oil.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
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