Suzuki DF140BG Troubleshooting
| Engine Model: Suzuki DF140BG |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.8 cu.in (2 L) |
| Rated Engine Power: 140 Hp (103 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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| Engine won't start or hard to start |
Empty gas tank - Fill it up.
Low-quality gasoline - Change fuel.
Fuel system clogged - Repair or replace.
Spark plug wire is disconnected or loose - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Spark plug need to be replaced.
Fuel filter is clogged - Replace or clean fuel filter.
Vapor separator needle valve is damaged or worn - Change vapor separator needle valve.
Fuel lines clogging - Fuel lines need to be cleaned.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel feed pump malfunction - Fuel feed pump need to be replaced.
Not adjusted or damaged throttle cable - Replace cable or adjust properly.
Valve clearance is incorrect - Check and adjust.
Improper valve timing - Set the valve timing properly.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is clogged or malfunction - Replace or clean as required.
Fuel regulator is faulty - Replace fuel regulator.
Electronic control modul failure - Change electronic control modul.
| Engine starts but immediately shuts off |
Spark plug is damaged - Change spark plug.
Worn or damaged vapor separator needle valve - Replace needle valve.
Defective ignition coil - Replace ignition coil as necessary.
Fuel tank air vent restricted or closed - Open or clean air vent.
Fuel pump defective - Replace or repair fuel pump.
Choke system malfunction - Check and repair choke system.
Excessive valve clearance - Adjust to proper valve clearance.
Valve timing is incorrect - Adjust valve timing as required.
Valve springs are bad or broken - Valve springs need to be changed.
Valves are stuck - Service the valves.
Poor compression - Check and change damaged parts.
Clogged fuel filter - Replace fuel filter.
Clogged or worn fuel injector - Clean or install new injector.
Low engine oil level - Fill up the oil to required level.
Oil pump malfunction - Install new oil pump.
Dirty water intake screen - Need to clean or wash.
Faulty thermostat - Thermostat need to be replaced.
Water pump failure - Change water pump.
Ignition system malfunction - Inspect ignition system and change faulty parts.
Fuel pump is clogged or faulty - Service or change fuel pump.
Worn or defective vapor separator needle valve - Change vapor separator needle valve.
Dirty fuel lines - Fuel lines need to be cleaned.
Fuel tank air vent restricted or closed - Open or clean air vent.
Plugged fuel filter - Fuel filter needs to be replaced.
Intake manifold air leaks - Change intake manifold gasket.
Water intake screen is dirty - Wash or clean as required.
Throttle link and throttle valve are wear or damaged - Replace faulty parts.
Dirty or faulty fuel injector - Replace or clean if necessary.
Engine is overloaded - Load reducing is recommended.
Clogged fuel pump or fuel injector - Clean or replace as required.
Ignition timing is improper - Ignition timing needs to be adjusted correctly.
Defective thermostat - Install new thermostat.
Defective water pump - Change water pump.
Propeller pitch or diameter incorrect - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard motor is positioned too low or too high - Position the engine correctly.
Engine oil level is low - Check oil level and add oil as required.
Defective oil pump - Oil pump need to be replaced.
Water intake screen is dirty - Need to clean or wash.
Improper valve setting - Adjust valves correctly.
| Abnormal engine noise or knocking |
Stale or low octane fuel - Use proper gasoline.
Engine is overloaded - Load reducing is recommended.
Improperly adjusted low idle speed - Adjustment required.
Dirty or faulty fuel pump - Inspect fuel pump and change as required.
Main bearings or crankshaft wear - Replace crankshaft or bearings.
Piston rings or cylinder bore are worn - Replace defective parts.
Fuel lines clogging - Clean fuel lines.
Faulty fuel injector - Install new fuel injector.
Dirty or damaged fuel pump - Check fuel pump and replace if necessary.
Ignition system is defective - Test ignition and replace failed parts.
Cylinder head gasket is worn - Replace cylinder head gasket.
Worn powerhead parts - Replace defective parts.
Stuck or burned valves - Service or change valves.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or bent propeller - Have propeller repaired or replaced.
Motor mounted at incorrect height on transom - Adjust the outboard motor height correctly.
Incorrect trim angle - Adjust trim angle correctly.
| Engine uses too much fuel |
Clogged or worn fuel injector - Clean or install new injector.
Loose or faulty spark plug - Tighten or replace spark plug.
Worn rings, piston, or sleeve - Replace defective components.
Electronic control unit failure - Replace ECU.
| Engine vibrates excessively |
Damaged or improper size of propeller - Have propeller repaired or replaced.
Damaged propeller shaft - Replace propeller shaft.
Weeds in the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Steering pivot is loose or damaged Tighten correctly or replace.
Battery voltage is low - Battery needs to be recharged.
Battery discharges quickly - Service or change the battery.
Faulty battery terminals or disconnected cables - Check wiring and clean or replace terminals.
Starter motor failing - Repair or install a new starter.
| Trim motor runs but trim system does not move up or down |
Oil level low - Check and refill oil.
Pump assembly faulty - Test pump and replace if necessary.
Leakage of manual drain valve - Close the valve or change it.
Motor or pump driveshaft faulty - Replace worn component.
| Trim does not fully up or down |
Defective pump assembly - Change pump.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Worn tilt ram piston O-ring - Install new O-ring.
Insufficient oil - 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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