Suzuki DF115A Troubleshooting
| Engine Model: Suzuki DF115A |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.7 cu.in (2 L) |
| Rated Engine Power: 115 Hp (84.6 kW) at 5500 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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| Engine doesn't start or difficult to start |
Gas tank is empty - Add fuel.
Incorrect fuel grade - Use correct fuel grade.
Dirty fuel lines - Inspect and clean.
Defective spark plug wire connection - Check spark plug wiring connection, repair or change.
Spark plug is damaged - Install new spark plug.
Fuel filter is plugged - Change fuel filter.
Worn or damaged vapor separator needle valve - Install new needle valve.
Dirty fuel lines - Service fuel lines.
Fuel tank air vent restricted or closed - Open or service air vent.
Faulty fuel feed pump - Replace or repair fuel pump.
Worn or unadjusted choke cable - Change cable or adjust properly.
Incorrect valve clearance - Check and adjust.
Valve timing is wrong - Adjust valve timing correctly.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is damaged or dirty - Replace or clean as required.
Fuel regulator is not operating - Install new fuel regulator.
Electronic control modul is not operating - Replace ECM.
| Engine stops after starting |
Spark plug is defective - Spark plug need to be replaced.
Vapor separator needle valve is damaged or worn - Change vapor separator needle valve.
Ignition coil is defective - Install a new ignition coil.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump is faulty - Install new pump or repair it.
Faulty choke system - Change choke system components as required.
Valve clearance is incorrect - Check and adjust.
Incorrect valve timing - Set the valve timing correctly.
Bad or damaged valve springs - Install new valve springs.
Stuck valves - Valves must be cleaned.
Weak cylinder compression - Check and repair damaged parts.
Plugged fuel filter - Replace or clean fuel filter.
Fuel injector is dirty or worn - Clean or install new injector.
Engine oil level is insufficient - Checking oil level and add if necessary.
Faulty oil pump - Change oil pump as required.
Water intake is blocked - Wash or clean as required.
Damaged thermostat - Change thermostat.
Faulty water pump - Change water pump.
Defective ignition system - Check ignition system and replace faulty parts.
Clogged or damaged fuel pump - Clean or install new fuel pump.
Vapor separator needle valve is damaged or worn - Change vapor separator needle valve.
Dirty fuel lines - Clean fuel lines.
Fuel tank air vent restricted or closed - Open or clean air vent.
Clogged fuel filter - Fuel filter needs changing.
Intake manifold air leaks - Install new gasket.
Water intake is clogged - Wash or clean as required.
Throttle valve and throttle link are defective or worn - Replace faulty parts.
Dirty or faulty fuel injector - Clean or install new injector.
Engine is under excessive load - Load reducing required.
Fuel pump or fuel injector is dirty - Replace or clean as required.
Ignition timing is wrong - Adjust ignition timing correctly.
Thermostat failure - Change thermostat.
Water pump failure - Water pump need to be replaced.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard motor is positioned too low or too high - Position the engine correctly.
Not enough engine oil - Check oil level and add oil as required.
Faulty oil pump - Change oil pump as required.
Dirty water intake screen - Clean and wash as required.
Valve setting is incorrect - Valves needs to be set correctly.
Stale fuel - Use proper fuel.
Engine is under excessive load - Load reducing is recommended.
Improperly adjusted low idle speed - Correct the settings.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Worn main bearings or crankshaft - Change defective components as required.
Piston rings or cylinder bore are damaged - Replace faulty parts.
Dirt in the fuel lines - Clean fuel system lines.
Fuel injector failure - Replace fuel injector.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Ignition system is defective - Inspect ignition system and change failed components.
Defective cylinder head gasket - Change cylinder head gasket.
Worn powerhead parts - Defective components need to be replaced.
Valves are stuck or burned - Clean or change valves.
Propeller pitch or diameter incorrect - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Engine mounted at wrong transom height - Check the outboard motor mounting height.
Incorrect trim angle - Adjust trim angle correctly.
| Excessive fuel consumption |
Clogged or worn fuel injector - Replace or clean as required.
Spark plug is loose or defective - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Change faulty parts.
Electronic control unit failure - Replace ECU.
| Engine vibrates excessively |
Damaged or bent propeller - Replace propeller.
Damaged propeller shaft - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is loose or damaged Tighten or replace.
| Starter motor is not working |
Battery power is low - Battery needs to be recharged.
Battery does not hold charge - Service battery or change it.
Bad terminals or disconnected battery cables - Connect cables correctly or replace terminals.
Faulty starter motor - Change or repair starter.
| Trim motor is running but trim system cannot move up or down |
Oil level low - Check oil level and add oil as required.
Pump assembly is faulty - Check pump and replace if necessary.
Manual release valve leaking - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Replace worn component.
| Trim does not fully up or down |
Pump assembly faulty - Change pump as required.
Tilt ram piston ball is in wrong position - Clean or repair.
Damaged tilt ram piston O-ring - Install new O-ring.
Oil level is low - Check and refill oil.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
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