Suzuki DF250AP Troubleshooting
| Engine Model: Suzuki DF250AP |
| 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 |
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| Engine difficult to start or doesn't start |
Empty fuel tank - Add fuel.
Improper fuel grade - Use quality gasoline.
Fuel system clogged - Repair or replace.
Spark plug wire is loose or disconnected - Check spark plug wiring connection, repair or change.
Spark plug is damaged - Spark plug need to be replaced.
Plugged fuel filter - Install new filter.
Vapor separator needle valve is worn or defective - Install new needle valve.
Fuel lines clogging - Clean fuel system lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel feed pump failure - Change or rebuild fuel feed pump.
Choke cable is not adjusted properly or worn - Replace cable or adjust correctly.
Incorrect valve clearance - Adjust to proper valve clearance.
Wrong valve timing - Adjust valve timing as required.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is clogged or malfunction - Replace or clean if necessary.
Fuel regulator is faulty - Replace fuel regulator.
ECM is faulty - Change electronic control modul.
| Engine starts and stalls suddenly |
Spark plug is damaged - Spark plug need to be replaced.
Damaged or wear vapor separator needle valve - Install new needle valve.
Ignition coil is defective - Change ignition coil as required.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump malfunction - Repair or change fuel pump.
Choke system malfunction - Check and repair choke system.
Valve clearance is wrong - Adjustment procedure required.
Incorrect valve timing - Set the valve timing correctly.
Valve springs are damaged or weak - New valve springs need to be installed.
Stuck valves - Clean the valves.
Weak cylinder compression - Check and replace worn parts.
Clogged fuel filter - Replace or clean fuel filter.
Damaged or clogged fuel injector - Clean or replace as required.
Engine oil level low - Add oil to the engine crankcase.
Defective oil pump - Change oil pump as required.
Water intake is blocked - Clean and wash as required.
Thermostat is defective - Change thermostat.
Damaged water pump - Change water pump as required.
Ignition system problems - Check ignition and replace faulty components.
Dirty or damaged fuel pump - Service or change fuel pump.
Damaged or wear vapor separator needle valve - Install new needle valve.
Restricted fuel lines - Fuel lines must be clean.
Closed or restricted fuel tank air vent - Open or service air vent.
Plugged fuel filter - Replace fuel filter.
Intake manifold air leaks - Install new gasket.
Water intake screen is dirty - Need to clean or wash.
Throttle link and throttle valve are worn or damaged - Change faulty components.
Damaged or clogged fuel injector - Clean or replace as required.
Engine is under excessive load - Load reducing is recommended.
Fuel injector or fuel pump is dirty - Clean or replace as required.
Bad ignition timing - Set the ignition timing correctly.
Thermostat failure - Install new thermostat.
Water pump failure - Water pump need to be replaced.
Propeller pitch or diameter incorrect - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard motor is positioned too low or too high - Position the engine correctly.
Engine oil insufficient - Checking oil level and add if necessary.
Oil pump is defective - Change oil pump as required.
Water intake screen is dirty - Need to clean or wash.
Valve setting is wrong - Valves needs to be adjusted properly.
| Abnormal engine noise or knocking |
Low octane fuel - Change fuel.
Engine is running overloaded - Load reducing required.
Wrong adjustment of low idle speed - Adjust idling as required.
Clogged or damaged fuel pump - Check fuel pump and change if required.
Crankshaft or main bearings are worn out - Change defective components as required.
Piston rings or cylinder bore are damaged - Change faulty components.
| Engine power is insufficient |
Fuel lines clogging - Clean fuel lines.
Fuel injector malfunction - Test fuel injector and change if necessary.
Fuel pump is clogged or faulty - Clean or replace fuel pump.
Ignition system malfunction - Inspect ignition system and change faulty parts.
Damaged cylinder head gasket - Replace the head gasket.
Damaged powerhead parts - Defective parts need to be replaced.
Valves are burned or stuck - Service or change valves.
Incorrect propeller selection - Install correct propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Engine mounted at wrong transom height - Have motor adjusted to proper transom height.
Improper trim angle - Adjust trim angle correctly.
Fuel injector is dirty or worn - Replace or clean if necessary.
Defective or loose spark plug - Replace or tighten spark plug.
Worn piston, rings, or sleeve - Replace faulty parts.
ECU is not functioning - Replace ECU.
Propeller bent or damaged - Replace propeller.
Propeller shaft malfunction - Replace propeller shaft.
Weeds clogs the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is loose or damaged Tighten or replace.
| Starter motor is not working |
Low battery voltage - Battery needs to be recharged.
Battery drains quickly - Service charging system or change battery.
Corroded battery terminals or disconnected wires - Connect wiring correctly or install new terminals.
Starter motor failing - Repair or replace starter.
| Trim motor is running but trim system cannot move up or down |
Not enough oil - Fill up oil.
Defective pump assembly - Inspect pump and change as required.
Leakage of manual release valve - Close the valve fully or replace it.
Motor or pump driveshaft faulty - Change defective component.
| Trim cannot be fully up or down |
Damaged pump assembly - Replace pump.
Tilt ram piston ball is in wrong position - Service or repair.
Tilt ram piston O-ring is worn - Change O-ring.
Oil level low - Fill up oil to required level.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
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