Suzuki DF350AMD Troubleshooting
| Engine Model: Suzuki DF350AMD |
| Engine Type: 4-stroke 6-cylinder DOHC 24-valve gasoline outboard engine |
| Total Displacement: 268 cu.in (4.4 L) |
| Rated Engine Power: 350 Hp (257.4 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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| Engine is not starting or hard starting |
Empty gas tank - Add fuel.
Improper fuel grade - Use quality gasoline.
There is air in the fuel system - Bleed the system.
Defective spark plug wire connection - Check the spark plug wire connection, repair or replace.
Spark plug is faulty - Spark plug need to be replaced.
Fuel filter is dirty - Change fuel filter.
Damaged or wear vapor separator needle valve - Install new needle valve.
Dirty fuel lines - Clean fuel system lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel feed pump malfunction - Replace or rebuild fuel feed pump.
Choke cable is worn or not adjusted properly - Replace cable or adjust correctly.
Improper valve clearance - Adjust valve clearance.
Improper valve timing - Set the valve timing correctly.
Low fuel pressure - Inspect low pressure fuel pump or inspect fuel system for leaks.
Fuel injector is clogged or malfunction - Replace or clean as required.
Fuel regulator is not operating - Change fuel regulator.
Electronic control modul is not operating - Install new ECM.
Defective spark plug - Replace spark plug.
Vapor separator needle valve is damaged or worn - Install new needle valve.
Ignition coil is not working - Change ignition coil as required.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel pump is faulty - Install new pump or repair it.
Choke system malfunction - Change choke system components as required.
Valve clearance is improper - Adjust valve clearance.
Valve timing is improper - Set the valve timing correctly.
Loose or worn valve springs - Valve springs need to be changed.
Valves sticking - Service the valves.
Bad compression - Check and repair damaged parts.
Fuel filter is clogged - Install new filter.
Fuel injector is dirty or worn - Clean or install new injector.
Engine oil level low - Fill up the engine oil.
Oil pump malfunction - Replace oil pump.
Water intake is blocked - Wash or clean as required.
Thermostat is faulty - Thermostat need to be replaced.
Water pump failure - Water pump need to be replaced.
Ignition system is defective - Inspect ignition system and change failed components.
Clogged or damaged fuel pump - Clean or install new fuel pump.
Worn or defective vapor separator needle valve - Change vapor separator needle valve.
Dirty fuel lines - Clean fuel system lines.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Clogged fuel filter - Fuel filter needs to be replaced.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake is clogged - Need to wash or clean.
Throttle link and throttle valve are worn or damaged - Change faulty components.
Fuel injector is damaged or dirty - Clean or install new injector.
Engine is overloaded - Reduce load.
Fuel pump or fuel injector is dirty - Clean or replace as required.
Bad ignition timing - Ignition timing needs to be adjusted correctly.
Defective thermostat - Replace thermostat.
Water pump malfunction - Replace water pump.
Improper propeller diameter or pitch - Replace propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Low engine oil level - Fill up the oil to required level.
Oil pump is defective - Replace oil pump.
Water intake is clogged - Need to clean or wash.
Improper valve setting - Adjust valves correctly.
| Abnormal engine noise or knocking |
Low octane gasoline - Use correct fuel.
Excessive engine load - Load reducing required.
Low idle speed setting is incorrect - Correct idle settings.
Dirty or defective fuel pump - Service or replace fuel pump.
Main bearings or crankshaft wear - Replace crankshaft or bearings.
Damaged piston rings or cylinder bore - Change defective parts.
Clogged fuel lines - Service fuel lines.
Faulty fuel injector - Inspect fuel injector and change as required.
Dirty or damaged fuel pump - Clean or replace fuel pump.
Ignition system failure - Inspect ignition system and change failed components.
Defective cylinder head gasket - Install new cylinder head gasket.
Powerhead components are worn - Change defective parts.
Valves are burned or stuck - Service or replace valves.
Propeller selection improperly - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Engine mounted at wrong transom height - Check the outboard engine mounting height.
Improper trim angle - Adjust trim angle.
| Excessive fuel consumption |
Damaged or clogged fuel injector - Clean or replace as required.
Spark plug is defective or loose - Tighten or replace spark plug.
Piston, sleeve, or rings are damaged - Replace faulty components as required.
ECU is not functioning - Install new ECU.
| Excessive motor vibration |
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft malfunction - Have propeller shaft replaced.
Weeds wraped around propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Loose or faulty steering pivot Tighten or replace.
Low battery power - Battery is drained, charge it.
Battery won’t hold charge - Battery needs service or replacement.
Battery terminals are corroded or wires are disconnected - Check wire connections and change or service terminals.
Starter motor is faulty - Change or repair starter.
| Trim motor runs but trim system does not move up or down |
Insufficient oil - Need to add the oil.
Defective pump assembly - Check pump and replace if necessary.
Leakage of manual drain valve - Close the valve fully or replace it.
Motor or pump driveshaft faulty - Replace defective component.
| Trim does not fully up or down |
Damaged pump assembly - Replace pump.
Tilt ram piston ball is in wrong position - Service or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Oil insufficient - Fill up oil to required level.
Lower check valve not seating in port side trim ram - Install valve correctly.
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