Mercury 175 Verado Troubleshooting
| Engine Model: Mercury Verado 175 |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 105.7 cu.in (1.7 L) |
| Rated Engine Power: 175 Hp (130 kW) at 6400 rpm |
| Fuel System: Sequential Multi-Point Electronic Fuel Injection (EFI) |
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| Engine is not starting or hard starting |
No gasoline in tank - Fill fuel up.
Improper fuel grade - Use quality fuel.
Air in the fuel pipes - Bleed the fuel pipes.
Loose or disconnected spark plug wire - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Spark plug need to be replaced.
Fuel filter is dirty - Fuel filter needs changing.
Vapor separator needle valve is worn or defective - Change vapor separator needle valve.
Fuel lines are clogged - Service fuel lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Damaged fuel feed pump - Replace or repair fuel pump.
Damaged or not adjusted choke cable - Change cable or adjust properly.
Improper valve clearance - Need to adjust valve clearance.
Valve timing is incorrect - Set the valve timing properly.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Fuel injector is damaged or dirty - Replace or clean if necessary.
Fuel regulator failure - Change fuel regulator.
ECM is not functioning - Change electronic control modul.
| Engine stalls after starting |
Spark plug is damaged - Change spark plug as required.
Vapor separator needle valve is bend or wear - Change vapor separator needle valve.
Ignition coil is damaged - Ignition coil must be replaced.
Fuel tank air vent restricted or closed - Open or clean air vent.
Fuel pump is faulty - Install new pump or repair it.
Choke system is damaged - Inspect and replace choke system components.
Incorrect valve clearance - Adjust valve clearance according to specifications.
Wrong valve timing - Set the valve timing properly.
Broken or bad valve springs - Replace valve springs.
Valves are stuck - Clean the valves.
Bad compression - Check and change damaged parts.
Fuel filter is plugged - Install new filter.
Damaged or clogged fuel injector - Replace or clean as required.
Insufficient engine oil - Check oil level and add oil as required.
Oil pump malfunction - Install new oil pump.
Water intake screen is dirty - Need to clean or wash.
Defective thermostat - Thermostat need to be replaced.
Water pump malfunction - Change water pump.
Ignition system failure - Test ignition and replace failed parts.
Dirty or faulty fuel pump - Inspect fuel pump and change as required.
Worn or damaged vapor separator needle valve - Replace needle valve.
Fuel lines are clogged - Clean fuel system lines.
Fuel tank air vent restricted or closed - Open or service air vent.
Dirty fuel filter - Fuel filter needs to be replaced.
Intake manifold is air leaking - Replace intake manifold gasket.
Water intake screen is dirty - Need to wash or clean.
Throttle valve and throttle link are damaged or worn - Change faulty components.
Damaged or clogged fuel injector - Clean or install new injector.
Engine is running overloaded - Reduce the load.
Fuel injector or fuel pump is clogged - Replace or clean if necessary.
Improper ignition timing - Set the ignition timing correctly.
Defective thermostat - Change thermostat.
Damaged water pump - Change water pump as required.
Improper propeller diameter or pitch - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard motor is positioned too low or too high - Mount the motor as required.
Engine oil level is low - Fill the crankcase with engine oil.
Oil pump failure - Install new oil pump.
Water intake screen is dirty - Need to wash or clean.
Valve setting is wrong - Adjust valves correctly.
| Abnormal engine noise or knocking |
Low octane gasoline - Use correct gasoline.
Engine overloaded - Reduce load.
Incorrectly set low idle speed - Adjust the low idle speed.
Dirty or faulty fuel pump - Service or replace fuel pump.
Main bearings or crankshaft wear - Crankshaft or bearings need to be replaced.
Damaged piston rings or cylinder bore - Replace defective parts.
Clogged fuel lines - Service fuel lines.
Fuel injector is damaged - Check fuel injector and replace if necessary.
Fuel pump is clogged or faulty - Service or change fuel pump.
Defective ignition - Inspect ignition system and change failed components.
Worn cylinder head gasket - Replace cylinder head gasket.
Powerhead parts are faulty - Replace defective parts.
Valves are burned or stuck - Change or service valves.
Improper propeller diameter or pitch - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard engine mounting height improperly - Adjust the engine to correct transom height.
Incorrect trim angle - Make the correct trim angle adjustment.
| Engine using too much gasoline |
Damaged or clogged fuel injector - Replace or clean if necessary.
Loose or faulty spark plug - Tighten or replace spark plug.
Worn sleeve, rings, or piston - Replace faulty parts.
ECU is not functioning - Replace ECU.
| Motor vibrates excessively |
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds in the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
Loose or faulty steering pivot Tighten correctly or replace.
Battery capacity is low - Battery needs to be recharged.
Battery drains quickly - Battery needs to be serviced or replaced.
Corroded battery terminals or disconnected wires - Connect wiring properly or install new terminals.
Starter motor is faulty - Starter should be changed.
| Trim motor runs but trim system does not move up or down |
Not enough oil - Need to add the oil.
Defective pump assembly - Test pump and replace if necessary.
Manual shut-off valve leaks - Close the valve or change it.
Pump driveshaft or motor damaged - Replace worn component.
| Trim does not fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Tilt ram piston O-ring is worn - Change O-ring.
Oil level is low - Need to add the oil.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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