Suzuki DF140BTX Troubleshooting
| Engine Model: Suzuki DF140BTX |
| 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 hard to start or doesn't start |
Fuel tank is empty - Add fuel.
Improper fuel grade - Change gasoline.
Water or air in fuel system - Remove air or water from system.
Defective spark plug wire connection - Check the spark plug wire connection, repair or replace.
Spark plug is defective - Change spark plug.
Clogged fuel filter - Install new filter.
Vapor separator needle valve is bend or wear - Change vapor separator needle valve.
Fuel lines clogging - Clean fuel lines.
Closed or clogged fuel tank air vent - Open or service air vent.
Defective fuel feed pump - Replace or repair fuel pump.
Incorrectly adjusted or damaged throttle cable - Adjust properly or change the cable.
Valve clearance is wrong - Adjustment procedure required.
Improper valve timing - Set the valve timing properly.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Dirty or faulty fuel injector - Replace or clean if necessary.
Fuel regulator is defective - Install new fuel regulator.
Electronic control modul failure - Change electronic control modul.
| Engine starts but immediately stops |
Spark plug is defective - Replace spark plug.
Damaged or wear vapor separator needle valve - Change vapor separator needle valve.
Damaged ignition coil - Ignition coil must be replaced.
Closed or restricted fuel tank air vent - Open or service air vent.
Defective fuel pump - Repair or change fuel pump.
Damaged choke system - Check and repair choke system.
Valve clearance is incorrect - Adjust to proper valve clearance.
Improper valve timing - Set the valve timing properly.
Valve springs are damaged or weak - Replace valve springs.
Valves sticking - Valves must be cleaned.
Low compression - Check and change damaged parts.
Clogged fuel filter - Replace fuel filter.
Fuel injector is faulty or clogged - Replace or clean as required.
Engine oil level is insufficient - Check oil level and add oil as required.
Damaged oil pump - Oil pump need to be replaced.
Clogged water intake - Wash or clean as required.
Damaged thermostat - Change thermostat.
Damaged water pump - Change water pump as required.
Ignition system failure - Check ignition system and replace faulty parts.
Dirty or faulty fuel pump - Service or change fuel pump.
Damaged or wear vapor separator needle valve - Change vapor separator needle valve.
Fuel lines clogging - Clean fuel system lines.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel filter is plugged - Fuel filter needs changing.
Intake manifold is air leaking - Install new gasket.
Water intake is blocked - Clean and wash as required.
Throttle valve and throttle link are defective or worn - Change faulty components.
Damaged or clogged fuel injector - Replace or clean as required.
Engine is running overloaded - Reduce load.
Fuel injector or fuel pump is dirty - Replace or clean if necessary.
Ignition timing is incorrect - Adjust ignition timing as required.
Faulty thermostat - Replace thermostat.
Water pump failure - Replace water pump.
Incorrect propeller selection - Check the propeller size.
Damaged or bent propeller - Replace propeller.
Outboard engine is mounted too high or too low - Mount the motor as required.
Engine oil level low - Check and refill engine oil.
Oil pump is defective - Install new oil pump.
Clogged water intake - Wash or clean as required.
Valve setting is improper - Adjust valves as required.
Low octane gasoline - Change fuel.
Engine is under excessive load - Reduce load.
Low idle speed setting is not correct - Correct the settings.
Fuel pump is clogged or faulty - Check fuel pump and replace if necessary.
Crankshaft or main bearings are worn out - Change or repair worn components.
Cylinder bore or piston rings are worn - Replace defective components.
Fuel lines are clogged - Service fuel lines.
Fuel injector is defective - Change fuel injector.
Fuel pump is clogged or faulty - Service or change fuel pump.
Ignition system problems - Inspect ignition system and change faulty parts.
Defective cylinder head gasket - Install new head gasket.
Powerhead parts are damaged - Defective parts need to be replaced.
Stuck or burned valves - Clean or replace valves.
Propeller selection improperly - Install correct propeller.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Adjust the outboard motor height correctly.
Improper trim angle - Adjust trim angle correctly.
| Engine using too much gasoline |
Fuel injector is faulty or clogged - Clean or install new injector.
Loose or faulty spark plug - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Change defective components.
Electronic control unit failure - Install new ECU.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds clogs the propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
| Starter motor is not working |
Low battery output - Low battery charging, charge as required.
Battery is not holding charge - Service charging system or replace battery.
Battery cables are disconnected or terminals are faulty - Connect cables correctly or replace terminals.
Starter motor is damaged - Replace or repair starter.
| Trim motor runs but trim system does not move up or down |
Not enough oil - Need to add the oil.
Pump assembly is defective - Check pump and replace if necessary.
Leakage of manual release valve - Valve need to be closed or changed.
Motor or pump driveshaft faulty - Change defective component.
| Trim does not fully up or down |
Pump assembly is damaged - Change pump.
Tilt ram piston ball is in wrong position - Service or repair.
Tilt ram piston O-ring is worn - Change O-ring.
Oil level is low - Check oil level and add oil as required.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
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