Kohler ECV940 Troubleshooting
| Engine Model: Kohler Command Pro ECV940 EFI |
| Engine Type: 4-cycle V-Twin cylinder vertical shaft air-cooled gasoline |
| Total Displacement: 61.1 cu.in (999 cc) |
| Rated Engine Power: 35 Hp (26.1 kW) at 3600 rpm |
| Fuel System Type: Electronic fuel injection (EFI) |
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| Engine starts up hard or doesn't start |
Empty fuel tank - Fill fuel up.
Incorrect fuel grade - Use correct gasoline grade.
Air in the fuel system - Air bleeding.
Loose or disconnected spark plug wire - Check spark plug wiring connection, repair or change.
Defective spark plug - Replace spark plug.
Clogged fuel filter - Install new filter.
Brake pedal not pushed down - Push the brake pedal down.
Crankshaft position sensor is loose or defective - Change as required.
Incorrectly adjusted or faulty throttle position sensor - Adjust or change throttle position sensor.
Low system voltage - Voltage regulator is faulty, replace it.
Clogged or defective fuel injectors - Test fuel injectors and change if necessary.
Dirt in the fuel lines - Service fuel lines.
Poor engine compression - Check cylinder block and replace damaged components.
Improperly adjusted or worn throttle cable - Change cable or adjust properly.
Plugged cooling fins - Wash or clean as required.
Defective ignition system - Check ignition and replace faulty components.
Choke cable is stuck or defective - Service or replace the cable.
Air filter is blocked - Change or clean air filter.
Fuel pump is defective or dirty - Check fuel pump and change if required.
Dirty or defective fuel injectors - Test fuel injectors and change if necessary.
Dirt in the fuel lines - Fuel lines must be clean.
Throttle position sensor faulty or incorrectly set - Adjust or change throttle position sensor.
| Engine starts and stops suddenly |
Spark plug is faulty - Install new spark plug.
Defective ignition coil - Replace ignition coil as necessary.
Worn or loose valve springs - Valve springs need to be changed.
Valves sticking - Clean the valves.
Plugged fuel filter - Fuel filter needs changing.
Clogged air filter - Replace or clean air filter.
Dirty fuel lines - Clean fuel lines.
Dirty or faulty fuel injectors - Inspect fuel injectors and change as required.
Governor setting is incorrect - Set governor properly.
Low engine oil level - Add oil to the engine crankcase.
Engine overloaded - Reduce load.
Air intake grill is clogged - Need to wash or clean.
Improper ignition timing - Set the ignition timing correctly.
Incorrect valve setting - Valves needs to be adjusted properly.
Stale gasoline - Use correct fuel.
Engine is overloaded - Reduce load.
Low engine oil level - Need to add engine oil.
Low idle speed set incorrectly - Adjust as required.
Dirty or defective fuel pump - Clean or install new fuel pump.
Worn main bearings or crankshaft - Need to install new components.
Valve clearance is wrong - Adjustment procedure required.
Worn cylinder bore or piston rings - Replace faulty parts.
Air filter is dirty - Replace or clean air filter.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Fuel lines are clogged - Fuel lines need to be cleaned.
Improper governor adjustment - Set governor properly.
One fuel injector malfunction - Install new fuel injector.
Defective ignition system - Inspect ignition system and change faulty parts.
Worn cylinder head gasket - Install new cylinder head gasket.
Valves are stuck or burned - Replace or clean valves.
Push rod is bent or worn - Push rod should be replaced.
Faulty cylinder block components - Change defective parts.
Clogged oil filter - Clean or replace oil filter.
Choke didn't open fully - Adjust or change choke cable.
Fuel injectors are dirty or defective - Check fuel injectors and replace if necessary.
Loose or defective spark plug - Tighten or replace spark plug.
Valves are stuck, burned, or worn - Replace or service valves.
Worn sleeve, piston, or rings - Change defective components.
Excessive valve clearance - Check and adjust.
| High engine oil consumption |
Worn gaskets or seals - Change worn parts according to specifications.
Worn valve stems and valve guides - Install new valves.
Piston rings are seized or worn - Install new piston rings.
Cylinder liner or piston is worn - Check liner and piston, change as required.
Breather hose or pipe is clogged - Replace or service.
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