Suzuki DF20A Troubleshooting
| Engine Model: Suzuki DF20A |
| Engine Type: 4-stroke 2-cylinder OHC 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 will not start or difficult to start |
Fuel tank is empty - Fill fuel up.
Low-quality gasoline - Use correct gasoline grade.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug wire is loose or disconnected - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Replace spark plug.
Plugged fuel filter - Fuel filter needs changing.
Worn or damaged vapor separator needle valve - Change vapor separator needle valve.
Fuel lines clogging - Fuel lines must be clean.
Fuel tank air vent closed or restricted - Open or service air vent.
Faulty fuel feed pump - Fuel feed pump need to be replaced.
Worn or unadjusted choke cable - Replace cable or adjust properly.
Valve clearance is incorrect - Check and adjust.
Valve timing is incorrect - Set the valve timing correctly.
Fuel pressure is low - Inspect low pressure fuel pump or inspect fuel system for leaks.
Dirty or faulty fuel injector - Clean or replace if necessary.
Fuel regulator is faulty - Replace fuel regulator.
Electronic control modul failure - Change electronic control modul.
| Engine starts but immediately stops |
Spark plug is damaged - Replace spark plug.
Worn or defective vapor separator needle valve - Replace needle valve.
Ignition coil is not working - Ignition coil must be replaced.
Fuel tank air vent clogged or closed - Open or service air vent.
Faulty fuel pump - Install new fuel pump or rebuild it.
Choke system malfunction - Change choke system components as required.
Excessive valve clearance - Adjust valve clearance.
Improper valve timing - Set the valve timing properly.
Worn or loose valve springs - Valve springs need to be changed.
Stuck valves - Valves need to be cleaned.
Bad cylinder compression - Check and repair damaged parts.
Plugged fuel filter - Install new filter.
Fuel injector is damaged or dirty - Clean or replace if necessary.
Engine oil insufficient - Checking oil level and add if necessary.
Faulty oil pump - Replace oil pump.
Clogged water intake - Need to wash or clean.
Damaged thermostat - Change thermostat.
Faulty water pump - Install new water pump.
| Engine runs intermittently |
Ignition system malfunction - Inspect ignition system and change failed components.
Dirty or defective fuel pump - Check fuel pump and change if required.
Damaged or wear vapor separator needle valve - Replace needle valve.
Fuel lines clogging - Service fuel lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Clogged fuel filter - Replace fuel filter.
Intake manifold is air leaking - Replace intake manifold gasket.
Clogged water intake - Clean and wash as required.
Throttle valve and throttle link are defective or worn - Change faulty components.
Clogged or worn fuel injector - Clean or replace if necessary.
Engine is running overloaded - Load reducing required.
Fuel pump or fuel injector is clogged - Clean or replace if necessary.
Improper ignition timing - Adjust ignition timing as required.
Thermostat is faulty - Install new thermostat.
Water pump failure - Change water pump as required.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Mount the motor as required.
Not enough engine oil - Add oil to the engine crankcase.
Oil pump failure - Oil pump need to be replaced.
Clogged water intake - Need to clean or wash.
Valve setting is wrong - Valves needs to be adjusted properly.
Stale fuel - Use proper gasoline.
Engine is running overloaded - Load reducing is recommended.
Low idle speed set incorrectly - Test and adjust.
Fuel pump is defective or dirty - Service or change fuel pump.
Crankshaft or main bearings are worn out - Have bearings or crankshaft replaced.
Piston rings or cylinder bore are worn - Change faulty parts.
Fuel lines clogging - Clean fuel lines.
Faulty fuel injector - Install new fuel injector.
Clogged or defective fuel pump - Service or replace fuel pump.
Ignition system malfunction - Check ignition and replace faulty components.
Blown cylinder head gasket - Replace the head gasket.
Worn powerhead components - Replace defective components as required.
Burned or stuck valves - Clean or change valves.
Incorrect propeller selection - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Outboard engine mounting height improperly - Check the outboard engine mounting height.
Incorrect trim angle - Adjust trim angle correctly.
| Excessive fuel consumption |
Fuel injector is damaged or dirty - Clean or replace as required.
Defective or loose spark plug - Replace or tighten spark plug.
Sleeve, rings, or piston are damaged - Replace faulty parts.
ECU is faulty - Change electronic control unit.
| Excessive engine vibration |
Propeller bent or damaged - Have propeller repaired or replaced.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds wraped around propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is loose or damaged Tighten or replace.
Low battery power - Charge the battery.
Battery won’t hold charge - Service battery or replace it.
Corroded battery terminals or disconnected wires - Connect cables correctly or replace terminals.
Starter motor is faulty - Change or repair starter.
| Trim motor runs but trim system does not move up or down |
Oil level is low - Checking oil level and add if necessary.
Defective pump assembly - Check pump and change if required.
Leakage of manual release valve - Valve need to be closed or changed.
Motor or pump driveshaft faulty - Change worn component.
| Trim cannot be fully up or down |
Pump assembly faulty - Change pump.
Tilt ram piston ball is displaced - Clean or repair.
Tilt ram piston O-ring damaged - Replace O-ring.
Not enough oil - Need to add the oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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