Suzuki DF250APX Troubleshooting
| Engine Model: Suzuki DF250APX |
| Engine Type: 4-stroke 6-cylinder DOHC 24-valve gasoline outboard engine |
| Total Displacement: 250 cu.in (4 L) |
| Rated Engine Power: 250 Hp (184 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
____________________________________________________________________________________
| Engine hard to start or won't start |
No gasoline in tank - Add fuel.
Wrong fuel grade - Change gasoline.
Dirty fuel system - Check and clean.
Spark plug wiring connection is defective - Check spark plug wiring connection, repair or change.
Faulty spark plug - Replace spark plug.
Dirty fuel filter - Install new filter.
Vapor separator needle valve is bend or wear - Change vapor separator needle valve.
Fuel lines are clogged - Fuel lines must be clean.
Closed or clogged fuel tank air vent - Open or clean air vent.
Fuel feed pump failure - Fuel feed pump need to be replaced.
Worn or improperly adjusted choke cable - Adjust correctly or change the cable.
Improper valve clearance - Check and adjust.
Valve timing is wrong - Set the valve timing properly.
Fuel pressure is low - Inspect low pressure fuel pump or inspect fuel system for leaks.
Damaged or clogged fuel injector - Replace or clean as required.
Fuel regulator is defective - Change fuel regulator.
ECM is not functioning - Replace ECM.
| Engine starts but stops suddenly |
Spark plug is faulty - Spark plug need to be replaced.
Worn or defective vapor separator needle valve - Replace needle valve.
Ignition coil is not working - Install a new ignition coil.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel pump is faulty - Change or rebuild fuel pump.
Faulty choke system - Change choke system components as required.
Valve clearance is wrong - Adjust to proper valve clearance.
Incorrect valve timing - Set the valve timing properly.
Weak or damaged valve springs - Change valve springs.
Valves are stuck - Service the valves.
Bad cylinder compression - Check and change damaged parts.
Fuel filter is clogged - Replace or clean fuel filter.
Fuel injector is dirty or worn - Replace or clean as required.
Engine oil level is low - Fill up the engine oil.
Damaged oil pump - Replace oil pump.
Water intake screen is dirty - Wash or clean as required.
Defective thermostat - Install new thermostat.
Faulty water pump - Install new water pump.
Ignition system malfunction - Inspect ignition system and change failed components.
Clogged or defective fuel pump - Clean or install new fuel pump.
Vapor separator needle valve is worn or defective - Replace needle valve.
Fuel lines are dirty - Service fuel lines.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Fuel filter is dirty - Replace fuel filter.
Intake manifold is air leaking - Replace intake manifold gasket.
Water intake is blocked - Need to wash or clean.
Throttle link and throttle valve are wear or damaged - Change faulty components.
Fuel injector is damaged or dirty - Clean or replace as required.
Excessive engine load - Load reducing is recommended.
Clogged fuel pump or fuel injector - Clean or replace as required.
Bad ignition timing - Adjust ignition timing as required.
Thermostat is defective - Replace thermostat.
Water pump malfunction - Replace water pump.
Incorrect propeller selection - Install correct propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine is mounted too high or too low - Mount the motor as required.
Low engine oil level - Add oil to the engine crankcase.
Faulty oil pump - Replace oil pump.
Water intake screen is dirty - Need to clean or wash.
Wrong valve setting - Set the valves properly.
Stale gasoline - Change fuel.
Engine overload - Reduce engine load.
Improperly adjusted low idle speed - Correct idle adjustment.
Fuel pump is damaged or dirty - Clean or change fuel pump.
Worn main bearings or crankshaft - Have bearings or crankshaft replaced.
Piston rings or cylinder bore are damaged - Replace faulty parts.
Restricted fuel lines - Service fuel lines.
Fuel injector is damaged - Install new fuel injector.
Fuel pump is damaged or dirty - Service or change fuel pump.
Defective ignition - Check ignition and replace faulty components.
Damaged cylinder head gasket - Cylinder-head gasket replacement required.
Powerhead components are worn - Defective components need to be replaced.
Valves are burned or stuck - Change or clean valves.
Propeller selection improperly - Replace propeller.
Propeller bent or damaged - Replace propeller.
Incorrect outboard motor mounting height - Adjust the outboard motor height correctly.
Improper trim angle - Adjust trim angle correctly.
| Excessive fuel consumption |
Fuel injector is dirty or worn - Clean or replace as required.
Spark plug is defective or loose - Replace or tighten spark plug.
Worn sleeve, rings, or piston - Replace faulty parts as required.
ECU is faulty - Change electronic control unit.
| Motor vibrates excessively |
Propeller bent or damaged - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten bolt.
Loose or faulty steering pivot Tighten or replace.
Low battery voltage - Battery is drained, recharge it.
Battery runs out quickly - Battery needs to be serviced or replaced.
Disconnected cables or faulty battery terminals - Connect wires properly or change terminals.
Starter motor failing - Repair or change starter.
| Trim motor runs but trim system does not move up or down |
Oil insufficient - Checking oil level and add if necessary.
Damaged pump assembly - Test pump and change if necessary.
Manual release valve leaking - Close the valve or change it.
Broken motor or pump driveshaft - Replace worn component.
| Trim cannot be fully up or down |
Pump assembly is damaged - Change pump.
Tilt ram piston ball is in wrong position - Clean or repair.
Tilt ram piston O-ring is worn - Install new O-ring.
Oil insufficient - Check oil level and add oil as required.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
