Suzuki DF70ATL Troubleshooting
| Engine Model: Suzuki DF70ATL |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 91.6 cu.in (1.5 L) |
| Rated Engine Power: 70 Hp (51.5 kW) at 5500 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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| Engine difficult to start or doesn't start |
Empty gas tank - Fill it up.
Low-quality gasoline - Use correct gasoline grade.
Air trapped in fuel system - Bleed air.
Defective wiring connection of spark plug - Check spark plug wiring connection, repair or change.
Faulty spark plug - Change spark plug.
Fuel filter is clogged - Replace or clean fuel filter.
Vapor separator needle valve is bend or wear - Replace needle valve.
Clogged fuel lines - Service fuel lines.
Fuel tank air vent clogged or closed - Open or clean air vent.
Damaged fuel feed pump - Replace or rebuild fuel feed pump.
Worn or improperly adjusted choke cable - Change cable or adjust properly.
Excessive valve clearance - Check and adjust.
Valve timing is incorrect - Adjust valve timing as required.
Low fuel pressure - Inspect low pressure fuel pump or inspect fuel system for leaks.
Fuel injector is dirty or worn - Clean or replace as required.
Fuel regulator is not operating - Change fuel regulator.
Electronic control modul is not operating - Install new ECM.
| Engine stops after starting |
Damaged spark plug - Change spark plug as required.
Vapor separator needle valve is bend or wear - Replace needle valve.
Defective ignition coil - Replace ignition coil as necessary.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Faulty fuel pump - Install new pump or repair it.
Faulty choke system - Inspect and replace choke system components.
Improper valve clearance - Adjust valve clearance.
Wrong valve timing - Set the valve timing correctly.
Valve springs are worn or loose - Change valve springs.
Valves sticking - Service the valves.
Low compression - Check and replace worn parts.
Dirty fuel filter - Fuel filter needs changing.
Dirty or faulty fuel injector - Replace or clean if necessary.
Engine oil insufficient - Add oil to the engine crankcase.
Oil pump is defective - Install new oil pump.
Water intake is clogged - Clean and wash as required.
Thermostat is defective - Replace thermostat.
Water pump is defective - Install new water pump.
Defective ignition - Inspect ignition system and change failed components.
Fuel pump is clogged or faulty - Check fuel pump and change if required.
Worn or defective vapor separator needle valve - Install new needle valve.
Clogged fuel lines - Service fuel lines.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Plugged fuel filter - Install new filter.
Intake manifold air leaks - Install new gasket.
Water intake is blocked - Clean and wash as required.
Throttle valve and throttle link are damaged or worn - Replace faulty components.
Fuel injector is clogged or malfunction - Replace or clean as required.
Engine overload - Load reducing required.
Clogged fuel pump or fuel injector - Replace or clean as required.
Improper ignition timing - Ignition timing needs to be set properly.
Faulty thermostat - Change thermostat.
Water pump malfunction - Water pump need to be replaced.
Incorrect propeller selection - Replace propeller.
Damaged or bent propeller - Replace propeller.
Outboard engine is positioned too low or too high - Position the engine correctly.
Insufficient engine oil - Add oil to the engine crankcase.
Oil pump is defective - Oil pump need to be replaced.
Dirty water intake screen - Need to wash or clean.
Wrong valve setting - Adjust valves as required.
Stale gasoline - Use proper fuel.
Engine is overloaded - Reduce the load.
Incorrectly set low idle speed - Correct idle settings.
Fuel pump is defective or dirty - Service or change fuel pump.
Crankshaft or main bearings are worn out - Worn parts replacement required.
Cylinder bore or piston rings are worn - Replace defective components.
Fuel lines are clogged - Fuel lines must be clean.
Damaged fuel injector - Test fuel injector and change if necessary.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
Ignition failure - Test ignition and replace failed parts.
Damaged cylinder head gasket - Install new cylinder head gasket.
Powerhead components are faulty - Change defective components.
Valves are stuck or burned - Replace or clean valves.
Improper propeller diameter or pitch - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard motor mounting height is set incorrectly - Adjust the engine to correct transom height.
Improper trim angle - Make the correct trim angle adjustment.
| Excessive fuel consumption |
Dirty or faulty fuel injector - Replace or clean as required.
Spark plug is loose or faulty - Re-tighten or replace spark plug.
Sleeve, rings, or piston are damaged - Replace defective parts as required.
Electronic control unit failure - Replace ECU.
| Excessive motor vibration |
Damaged or improper size of propeller - Replace propeller.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds in the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten bolt.
Steering pivot is faulty or loose Tighten or replace.
Battery voltage is low - Charge the battery.
Battery discharges quickly - Service battery or replace it.
Battery terminals are corroded or wires are disconnected - Connect wiring properly or install new terminals.
Starter motor is defective - Repair or install a new starter.
| Trim motor runs but trim system does not move up or down |
Oil insufficient - Need to add the oil.
Damaged pump assembly - Check pump and change if required.
Leakage of manual drain valve - Valve need to be closed or changed.
Faulty pump driveshaft or motor - Replace worn component.
| Trim does not fully up or down |
Damaged pump assembly - Change pump.
Tilt ram piston ball is in wrong position - Service or repair.
Damaged tilt ram piston O-ring - Change O-ring.
Oil level is insufficient - Checking oil level and add if necessary.
Lower check valve not seating in port side trim ram - Install valve correctly.
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