Suzuki DF350A Troubleshooting
| Engine Model: Suzuki DF350A |
| Engine Type: 4-stroke 6-cylinder DOHC 24-valve gasoline outboard engine |
| Total Displacement: 267.9 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 starts hard or will not start |
No fuel in fuel tank - Fill fuel up.
Wrong grade of gasoline - Use quality gasoline.
Dirt and debris in fuel system - Remove debris and dirt.
Defective wiring connection of spark plug - Inspect spark plug wiring connection, change or repair.
Spark plug is defective - Replace spark plug.
Clogged fuel filter - Replace or clean fuel filter.
Vapor separator needle valve is damaged or worn - Install new needle valve.
Fuel lines are dirty - Service fuel lines.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Damaged fuel feed pump - Repair or change fuel feed pump.
Choke cable is unadjusted or damaged - Change cable or adjust properly.
Valve clearance is improper - Adjustment procedure required.
Valve timing is improper - Adjust valve timing as required.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is clogged or malfunction - Clean or replace if necessary.
Fuel regulator is defective - Change fuel regulator.
ECM is faulty - Install new ECM.
| Engine stops after starting |
Spark plug is damaged - Install new spark plug.
Vapor separator needle valve is damaged or worn - Install new needle valve.
Ignition coil is damaged - Install a new ignition coil.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump is faulty - Repair or change fuel pump.
Choke system malfunction - Check and repair choke system.
Valve clearance is incorrect - Adjust to proper valve clearance.
Valve timing is wrong - Adjust valve timing as required.
Valve springs are loose or broken - Valve springs need to be changed.
Valves sticking - Valves must be cleaned.
Low compression - Check and replace worn parts.
Fuel filter is dirty - Change fuel filter.
Damaged or clogged fuel injector - Clean or replace as required.
Low engine oil level - Fill up the engine oil.
Damaged oil pump - Replace oil pump.
Dirty water intake screen - Clean and wash as required.
Thermostat is defective - Change thermostat as required.
Defective water pump - Install new water pump.
Defective ignition system - Inspect ignition system and change failed components.
Fuel pump is faulty or clogged - Check fuel pump and change if required.
Worn or damaged vapor separator needle valve - Replace needle valve.
Fuel lines clogging - Clean fuel system lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel filter is clogged - Change fuel filter.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake is clogged - Wash or clean as required.
Throttle valve and throttle link are defective or worn - Change faulty components.
Fuel injector is dirty or worn - Clean or install new injector.
Engine overloaded - Reduce engine load.
Fuel injector or fuel pump is dirty - Replace or clean if necessary.
Wrong ignition timing - Adjust ignition timing correctly.
Defective thermostat - Change thermostat.
Water pump malfunction - Change water pump as required.
Improper propeller diameter or pitch - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Engine oil level is insufficient - Check oil level and add oil as required.
Faulty oil pump - Change oil pump as required.
Water intake screen is dirty - Need to wash or clean.
Valve setting is improper - Adjust valves correctly.
Stale fuel - Use proper fuel.
Excessive engine load - Reduce load.
Incorrectly adjusted low idle speed - Correct idle adjustment.
Dirty or damaged fuel pump - Service or replace fuel pump.
Main bearings or crankshaft failure - Worn parts replacement required.
Piston rings or cylinder bore are worn - Change defective components.
Restricted fuel lines - Fuel lines must be clean.
Fuel injector is damaged - Check fuel injector and change if required.
Dirty or damaged fuel pump - Clean or change fuel pump.
Defective ignition - Check ignition and replace faulty components.
Cylinder head gasket is damaged - Replace the head gasket.
Powerhead components are worn - Change defective components.
Valves are stuck or burned - Replace or clean valves.
Propeller selection improperly - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Adjust the outboard motor height correctly.
Incorrect trim angle - Adjust trim angle correctly.
| Engine using too much gasoline |
Fuel injector is clogged or malfunction - Replace or clean if necessary.
Spark plug is loose or defective - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Change defective parts.
ECU is not functioning - Install new ECU.
Damaged or bent propeller - Replace propeller.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds in the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is faulty or loose Tighten correctly or replace.
Low battery capacity - Charge the battery.
Battery is draining quickly - Service battery or change it.
Disconnected wiring or bad battery terminals - Connect wiring correctly or install new terminals.
Damaged starter motor - Starter should be changed.
| Trim motor runs but trim system does not move up or down |
Oil insufficient - Fill up oil.
Pump assembly is faulty - Inspect pump and change as required.
Leakage of manual drain valve - Valve need to be closed or changed.
Broken motor or pump driveshaft - Change worn component.
| Trim cannot be fully up or down |
Pump assembly is faulty - Change pump as required.
Tilt ram piston ball is in wrong position - Clean or repair.
Tilt ram piston O-ring damaged - Install new O-ring.
Insufficient oil - Fill up oil to required level.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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