Suzuki DF20AS Troubleshooting
| Engine Model: Suzuki DF20AS |
| Engine Type: 4-stroke 2-cylinder short shaft gasoline outboard engine |
| Total Displacement: 20.1 cu.in (327 cc) |
| Rated Engine Power: 20 Hp (14.7 kW) at 6300 rpm |
| Fuel System: Multi-point sequential electronic fuel injection |
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| Engine starts up hard or won't start |
No gasoline in tank - Add fuel.
Low-quality gasoline - Use quality gasoline.
Water or air in fuel system - Remove air or water from system.
Damaged spark plug wiring connection - Check the spark plug wire connection, repair or replace.
Damaged spark plug - Change spark plug.
Plugged fuel filter - Fuel filter needs to be replaced.
Vapor separator needle valve is damaged or worn - Replace needle valve.
Clogged fuel lines - Fuel lines must be clean.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Fuel feed pump malfunction - Fuel feed pump need to be replaced.
Throttle cable is damaged or adjusted incorrectly - Replace cable or adjust correctly.
Valve clearance is not correct - Adjust to proper valve clearance.
Valve timing is improper - Set the valve timing correctly.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is dirty or worn - Clean or replace if necessary.
Fuel regulator malfunction - Change fuel regulator.
ECM is faulty - Replace ECM.
| Engine starts but stalls immediately |
Spark plug is damaged - Install new spark plug.
Vapor separator needle valve is bend or wear - Replace needle valve.
Damaged ignition coil - Replace ignition coil as necessary.
Closed or restricted fuel tank air vent - Open or service air vent.
Fuel pump defective - Install new pump or repair it.
Damaged choke system - Change choke system components as required.
Valve clearance is incorrect - Adjust valve clearance.
Valve timing is wrong - Set the valve timing properly.
Damaged or weak valve springs - Change valve springs.
Valves are stuck - Valves need to be cleaned.
Low compression - Check and change damaged parts.
Fuel filter is dirty - Replace or clean fuel filter.
Fuel injector is dirty or worn - Clean or replace if necessary.
Lack of engine oil - Fill the crankcase with engine oil.
Oil pump malfunction - Replace oil pump.
Water intake screen is dirty - Need to clean or wash.
Thermostat is defective - Change thermostat as required.
Faulty water pump - Change water pump.
Ignition failure - Check ignition system and replace faulty parts.
Dirty or defective fuel pump - Clean or replace fuel pump.
Worn or damaged vapor separator needle valve - Replace needle valve.
Fuel lines are clogged - Fuel lines need to be cleaned.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Plugged fuel filter - Install new filter.
Intake manifold air leaks - Change intake manifold gasket.
Water intake is clogged - Need to clean or wash.
Throttle valve and throttle link are damaged or worn - Change faulty components.
Fuel injector is clogged or malfunction - Replace or clean if necessary.
Engine is under excessive load - Reduce load.
Fuel pump or fuel injector is clogged - Clean or replace as required.
Incorrect ignition timing - Set the ignition timing properly.
Thermostat is defective - Change thermostat.
Defective water pump - Water pump need to be replaced.
Improper propeller diameter or pitch - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard engine is positioned too low or too high - Mount the motor as required.
Engine oil level is insufficient - Check oil level and add oil as required.
Oil pump malfunction - Install new oil pump.
Dirty water intake screen - Need to wash or clean.
Valve setting is improper - Adjust valves as required.
Stale gasoline - Use correct gasoline.
Excessive engine load - Load reducing required.
Incorrectly adjusted low idle speed - Adjustment required.
Fuel pump is damaged or dirty - Check fuel pump and change if required.
Main bearings or crankshaft are worn out - Worn parts replacement required.
Worn piston rings or cylinder bore - Replace defective parts.
Clogged fuel lines - Service fuel lines.
Damaged fuel injector - Check fuel injector and change if required.
Dirty or faulty fuel pump - Clean or replace fuel pump.
Defective ignition system - Test ignition and replace failed parts.
Cylinder head gasket is damaged - Install new head gasket.
Powerhead parts are damaged - Replace defective parts as required.
Valves are burned or stuck - Change or clean valves.
Propeller selection improperly - Replace propeller.
Damaged or bent propeller - Replace propeller.
Outboard motor mounting height is set incorrectly - Have motor adjusted to proper transom height.
Incorrect trim angle - Adjust trim angle correctly.
| Engine uses too much fuel |
Fuel injector is clogged or malfunction - Clean or install new injector.
Loose or defective spark plug - Change or re-tighten spark plug.
Sleeve, rings, or piston are damaged - Change faulty components.
ECU is not functioning - Replace ECU.
| Excessive engine vibration |
Damaged or bent propeller - Replace propeller.
Propeller shaft damaged - Have propeller shaft replaced.
Weeds in the propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is loose or damaged Tighten correctly or replace.
Low battery power - Recharge the battery.
Battery is draining quickly - Service or replace the battery.
Terminals are faulty or battery cables are disconnected - Check cables and service or change terminals.
Starter motor is defective - Replace or repair starter.
| Trim motor is running but trim system cannot move up or down |
Oil level is insufficient - Check and refill oil.
Pump assembly is defective - Test pump and change if necessary.
Leakage of manual release valve - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Change defective 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 damaged - Install new O-ring.
Insufficient oil - Fill up oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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