Kohler ECH740 Troubleshooting
| Engine Model: Kohler Command Pro ECH740 EFI |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 45.6 cu.in (747 cc) |
| Rated Engine Power: 25 Hp (18.6 kW) at 3600 rpm |
| Fuel System Type: Electronic fuel injection (EFI) |
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| Engine difficult to start or doesn't start |
Gas tank is empty - Fill gasoline up.
Improper fuel grade - Use correct gasoline grade.
There is air in the fuel system - Bleed the system.
Defective wiring connection of spark plug - Check spark plug wiring connection, repair or change.
Spark plug is faulty - Replace spark plug.
Fuel filter is plugged - Change fuel filter.
Brake pedal not depressed - Press the brake pedal.
Crankshaft position sensor is faulty or loose - Crankshaft position sensor must be replaced.
Throttle position sensor faulty or incorrectly set - Set throttle position sensor or change it.
Low system voltage - Voltage regulator is defective, change it.
Fuel injectors are defective or dirty - Inspect fuel injectors and change as required.
Clogged fuel lines - Service fuel lines.
Low cylinder compression - Check cylinder block and replace worn parts.
Worn or improperly adjusted choke cable - Change cable or adjust correctly.
Air intake grill is clogged - Need to clean or wash.
Ignition failure - Inspect ignition system and change failed components.
Choke cable is stuck or faulty - Service or change the cable.
Air filter is dirty - Service or replace air filter.
Dirty or defective fuel pump - Check fuel pump and replace if necessary.
Dirty or faulty fuel injectors - Clean or change fuel injectors.
Clogged fuel lines - Clean fuel system lines.
Throttle position sensor damaged or incorrectly adjusted - Adjust throttle position sensor or replace it.
| Engine starts but stalls suddenly |
Faulty spark plug - Replace spark plug.
Defective ignition coil - Change ignition coil as required.
Bad or damaged valve springs - Valve springs need to be changed.
Valves sticking - Valves must be cleaned.
Plugged fuel filter - Change fuel filter.
Air filter element is plugged - Clean or replace air filter.
Dirt in the fuel lines - Clean fuel lines.
Fuel injectors are damaged or dirty - Test fuel injectors and replace if necessary.
Governor setting is improper - Adjust governor as required.
Engine oil level is insufficient - Add oil to the engine crankcase.
Excessive engine load - Reduce engine load.
Cooling fins are clogged - Clean and wash as required.
Wrong ignition timing - Adjust ignition timing correctly.
Incorrect valve setting - Adjust valves as required.
| Abnormal engine knocking or noise |
Stale gasoline - Use correct fuel.
Excessive engine load - Reduce load.
Lack of engine oil - Check oil level and add oil as required.
Too low idle RPM - Correct idle adjustment.
Dirty or faulty fuel pump - Clean or replace fuel pump.
Crankshaft or main bearings failure - Need to install new components.
Valve clearance is incorrect - Adjust valve clearance.
Damaged cylinder bore or piston rings - Change defective components.
| Engine power is insufficient |
Air filter element is clogged - Replace or service air filter.
Fuel pump is damaged or dirty - Check fuel pump and change if required.
Restricted fuel lines - Fuel lines must be clean.
Improper governor adjustment - Governor needs to be adjusted correctly.
Defective one fuel injector - Check fuel injector and replace if necessary.
Defective ignition system - Inspect ignition system and change failed components.
Worn cylinder head gasket - Replace cylinder head gasket.
Stuck or burned valves - Clean or replace valves.
Worn or damaged push rod - Change push rod.
Cylinder block parts are damaged - Replace defective components.
Plugged oil filter - Replace or service oil filter.
| Engine using too much gasoline |
Throttle does not open well - Inspect throttle cable and adjust it.
Fuel injectors are dirty or defective - Test fuel injectors and change if necessary.
Defective or loose spark plug - Spark plug need to be tightened or replaced.
Valves are stuck, worn, or burned - Replace or clean valves.
Worn piston, rings, or sleeve - Replace defective components as required.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
Defective seals or gaskets - Defective components must be replaced.
Valve stems and guides are worn - Replace the valves.
Stuck or worn piston rings - Install new piston rings.
Scuffed cylinder liner or piston - Inspect liner and piston, change as necessary.
Breather hose or pipe is blocked - Replace or service.
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