Kohler ECV650 Troubleshooting
| Engine Model: Kohler Command Pro ECV650 EFI |
| Engine Type: 4-cycle V-Twin cylinder vertical shaft air-cooled gasoline |
| Total Displacement: 42.4 cu.in (694 cc) |
| Rated Engine Power: 21 Hp (15.7 kW) at 3600 rpm |
| Fuel System Type: Electronic fuel injection (EFI) |
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| Engine doesn't start or difficult to start |
Empty fuel tank - Add gasoline.
Wrong grade of gasoline - Change gasoline.
Clogged fuel system - Remove clogging.
Spark plug wire is loose or disconnected - Check the spark plug wire connection, repair or replace.
Spark plug is damaged - Install new spark plug.
Dirty fuel filter - Fuel filter needs to be replaced.
Safety contact for brake pedal defective - Install new part.
Broken or loose crankshaft position sensor - Crankshaft position sensor must be replaced.
Throttle position sensor faulty or incorrectly set - Adjust throttle position sensor or replace it.
Lack of system voltage - Defective voltage regulator, change it.
Fuel injectors are clogged or faulty - Clean or change fuel injectors.
Clogged fuel lines - Fuel lines need to be cleaned.
Low compression - Check and replace worn parts.
Worn or unadjusted choke cable - Change cable or adjust correctly.
Clogged cooling fins - Clean and wash as required.
Ignition system is defective - Inspect ignition system and change failed components.
Throttle cable is stuck or faulty - Replace or clean the cable.
Air filter element is plugged - Service or replace air filter.
Dirty or faulty fuel pump - Test fuel pump and replace if necessary.
Clogged or damaged fuel injectors - Check fuel injectors and replace if necessary.
Clogged fuel lines - Service fuel lines.
Incorrectly adjusted or faulty throttle position sensor - Adjust or replace throttle position sensor.
| Engine stalls after starting |
Spark plug is faulty - Spark plug need to be replaced.
Defective ignition coil - Ignition coil must be replaced.
Worn or loose valve springs - Valve springs need to be changed.
Stuck valves - Clean the valves.
Dirty fuel filter - Fuel filter needs changing.
Dirty air filter element - Clean or change air filter.
Dirty fuel lines - Fuel lines must be clean.
Clogged or damaged fuel injectors - Clean or install new fuel injectors.
Governor setting is improper - Adjust governor as required.
Engine oil level low - Check oil level and add oil as required.
Engine overloaded - Load reducing required.
Air intake screen is plugged - Wash or clean as required.
Wrong ignition timing - Ignition timing needs to be set properly.
Wrong valve setting - Valves needs to be adjusted properly.
| Abnormal engine knocking or noise |
Low octane fuel - Use proper fuel.
Engine overload - Reduce the load.
Engine oil level is low - Fill the crankcase with engine oil.
Wrong adjustment of low idle speed - Correct idle adjustment.
Clogged or defective fuel pump - Service or change fuel pump.
Crankshaft or main bearings failure - Replace crankshaft or bearings.
Improper valve clearance - Adjust to proper valve clearance.
Damaged piston rings or cylinder bore - Replace faulty components.
Air filter is dirty - Replace or service air filter.
Clogged or damaged fuel pump - Check fuel pump and change if required.
Fuel lines are clogged - Service fuel lines.
Governor adjustment is incorrect - Governor needs to be set properly.
One fuel injector malfunction - Replace fuel injector.
Defective ignition - Inspect ignition system and change failed components.
Cylinder head gasket is blown - Install new cylinder head gasket.
Valves are stuck or burned - Service or replace valves.
Push rod is worn or defective - Change push rod.
Worn cylinder block parts - Replace defective components as required.
Oil filter is blocked - Replace or service oil filter.
| Engine using too much gasoline |
Choke doesn't open well - Adjust or replace choke cable.
Clogged or damaged fuel injectors - Clean or install new fuel injectors.
Loose or faulty spark plug - Re-tighten or replace spark plug.
Valves are stuck, burned, or worn - Clean or replace valves.
Sleeve, piston, or rings are damaged - Change faulty parts.
Valve clearance is not correct - Check and adjust.
| High engine oil consumption |
Damaged seals or gaskets - Replace worn parts to avoid leaks.
Valve guides or stems are damaged - Install new valves.
Piston rings are seized or worn - Replace piston rings.
Cylinder liner or piston is scored - Inspect liner and piston, fit new parts as necessary.
Breather pipe or hose is plugged - Change or clean.
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