Suzuki DF70A Troubleshooting
| Engine Model: Suzuki DF70A |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 91.6 cu.in (1.5 L) |
| Rated Engine Power: 70 Hp (51.5 kW) at 5500 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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| Engine will not start or hard to start |
Gas tank is empty - Fill it up.
Incorrect fuel grade - Use quality gasoline.
Air in fuel system - Bleed fuel system.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Spark plug is damaged - Install new spark plug.
Clogged fuel filter - Install new filter.
Vapor separator needle valve is worn or defective - Install new needle valve.
Clogged fuel lines - Service fuel lines.
Closed or clogged fuel tank air vent - Open or clean air vent.
Fuel feed pump malfunction - Repair or change fuel feed pump.
Throttle cable is damaged or adjusted incorrectly - Adjust properly or change the cable.
Valve clearance is not correct - Adjustment procedure required.
Wrong valve timing - Adjust valve timing correctly.
Low fuel pressure - Check low pressure fuel pump or check system for fuel leaks.
Fuel injector is clogged or malfunction - Clean or install new injector.
Fuel regulator is defective - Change fuel regulator.
ECM is not functioning - Install new ECM.
| Engine starts but then shuts off |
Spark plug is damaged - Spark plug need to be replaced.
Damaged or wear vapor separator needle valve - Install new needle valve.
Damaged ignition coil - Change ignition coil as required.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump malfunction - Repair or change fuel pump.
Faulty choke system - Check and repair choke system.
Valve clearance is not correct - Adjust to proper valve clearance.
Valve timing is wrong - Adjust valve timing correctly.
Valve springs are weak or broken - Replace valve springs.
Valves are stuck - Service the valves.
Low compression - Inspect and replace defective parts.
Plugged fuel filter - Change fuel filter.
Clogged or worn fuel injector - Replace or clean as required.
Low engine oil level - Fill the crankcase with engine oil.
Oil pump failure - Replace oil pump.
Clogged water intake - Wash or clean as required.
Defective thermostat - Install new thermostat.
Water pump is defective - Change water pump.
Ignition system is defective - Check ignition and replace faulty components.
Fuel pump is faulty or clogged - Service or replace fuel pump.
Vapor separator needle valve is bend or wear - Replace needle valve.
Dirt in the fuel lines - Clean fuel lines.
Closed or restricted fuel tank air vent - Open or service air vent.
Dirty fuel filter - Replace or clean fuel filter.
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 components.
Clogged or worn fuel injector - Clean or install new injector.
Engine is overloaded - Load reducing is recommended.
Fuel injector or fuel pump is dirty - Replace or clean as required.
Incorrect ignition timing - Adjust ignition timing correctly.
Thermostat is faulty - Thermostat need to be replaced.
Faulty water pump - Install new water pump.
Propeller selection improperly - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Mount the motor as required.
Engine oil level is low - Checking oil level and add if necessary.
Damaged oil pump - Replace oil pump.
Water intake screen is dirty - Clean and wash as required.
Valve setting is incorrect - Adjust valves correctly.
Stale fuel - Change gasoline.
Engine is overloaded - Reduce engine load.
Incorrectly set low idle speed - Adjust the low idle speed.
Fuel pump is damaged or dirty - Clean or replace fuel pump.
Worn crankshaft or main bearings - Need to install new components.
Piston rings or cylinder bore are damaged - Change defective parts.
Dirt in the fuel lines - Service fuel lines.
Fuel injector is defective - Replace fuel injector.
Dirty or faulty fuel pump - Check fuel pump and replace if necessary.
Ignition system failure - Check ignition system and replace faulty parts.
Cylinder head gasket is worn - Change cylinder head gasket.
Powerhead components are damaged - Change defective parts.
Stuck or burned valves - Replace or service valves.
Incorrect propeller selection - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine mounting height improperly - Adjust the engine to correct transom height.
Improper trim angle - Make the correct trim angle adjustment.
| Excessive fuel consumption |
Fuel injector is faulty or clogged - Clean or replace if necessary.
Spark plug is loose or defective - Replace or tighten spark plug.
Worn sleeve, rings, or piston - Replace faulty components.
ECU is faulty - Change electronic control unit.
Damaged or bent propeller - Replace propeller.
Propeller shaft damaged - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten bolt.
Steering pivot is faulty or loose Tighten or replace.
Low battery power - Battery is drained, recharge it.
Battery does not hold charge - Service or replace the battery.
Disconnected cables or faulty battery terminals - Connect cables properly or replace terminals.
Defective starter motor - Change or repair starter.
| Trim motor is running but trim system cannot move up or down |
Low oil level - Need to add the oil.
Pump assembly faulty - Inspect pump and change as required.
Leakage of manual release valve - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Change defective component.
| Trim cannot be fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is in wrong position - Clean or repair.
Worn tilt ram piston O-ring - Install new O-ring.
Insufficient oil - Fill up oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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