Kohler CH745 EFI Troubleshooting
| Engine Model: Kohler Command Pro CH745 EFI |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 44 cu.in (725 cc) |
| Rated Engine Power: 28 Hp (20.9 kW) at 3600 rpm |
| Fuel System Type: Electronic fuel injection (EFI) |
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| Engine hard to start or doesn't start |
No gasoline in tank - Fill it up.
Low-quality gasoline - Use correct gasoline grade.
Dirty fuel system - Check and clean.
Spark plug wire is disconnected or loose - Check spark plug wiring connection, repair or change.
Damaged spark plug - Install new spark plug.
Fuel filter is clogged - Fuel filter needs changing.
Safety contact for brake pedal defective - Install new part.
Loose or defective crankshaft position sensor - Install new crankshaft position sensor.
Faulty or incorrectly adjusted throttle position sensor - Adjust or replace throttle position sensor.
System voltage is low - Voltage regulator is defective, change it.
Fuel injectors are clogged or faulty - Check fuel injectors and change if required.
Dirt in the fuel lines - Fuel lines must be clean.
Poor engine compression - Check cylinder block and replace damaged components.
Throttle cable is worn or adjusted improperly - Adjust correctly or replace the cable.
Air intake screen is plugged - Wash or clean as required.
Defective ignition - Inspect ignition system and change failed components.
Faulty or stuck throttle cable - Clean or replace the cable.
Air filter element is clogged - Clean or replace air filter.
Clogged or defective fuel pump - Service or change fuel pump.
Clogged or defective fuel injectors - Check fuel injectors and replace if necessary.
Dirty fuel lines - Fuel lines need to be cleaned.
Faulty or incorrectly adjusted throttle position sensor - Replace or adjust throttle position sensor.
| Engine starts but then stalls |
Defective spark plug - Change spark plug as required.
Damaged ignition coil - Install a new ignition coil.
Valve springs are damaged or weak - Install new valve springs.
Valves sticking - Clean the valves.
Fuel filter is dirty - Fuel filter needs changing.
Air filter element is clogged - Change or service air filter.
Restricted fuel lines - Fuel lines must be clean.
Fuel injectors are defective or dirty - Clean or install new fuel injectors.
Governor setting is incorrect - Governor needs to be set properly.
Low engine oil level - Check and refill engine oil.
Engine overloaded - Reduce the load.
Cooling fins are plugged - Need to wash or clean.
Incorrect ignition timing - Set the ignition timing correctly.
Valve setting is improper - Set the valves properly.
Stale or low octane fuel - Change gasoline.
Engine is under excessive load - Reduce engine load.
Engine oil level is insufficient - Need to add engine oil.
Improperly adjusted low idle speed - Adjust the low idle speed.
Fuel pump is dirty or defective - Test fuel pump and replace if necessary.
Crankshaft or main bearings wear - Crankshaft or bearings need to be replaced.
Valve clearance is incorrect - Check and adjust.
Piston rings or cylinder bore are damaged - Replace faulty components.
Air filter element is clogged - Change or service air filter.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
Fuel lines are dirty - Fuel lines need to be cleaned.
Incorrect governor adjustment - Adjust governor as required.
One fuel injector is fault - Inspect fuel injector and change as required.
Ignition system failure - Inspect ignition system and change faulty parts.
Worn cylinder head gasket - Install new cylinder head gasket.
Burned or stuck valves - Clean or change valves.
Push rod is worn or defective - Change push rod.
Damaged cylinder block parts - Defective parts need to be replaced.
Oil filter is dirty - Service or change oil filter.
Throttle opening is not full - Adjust or change throttle cable.
Dirty or defective fuel injectors - Service or replace fuel injectors.
Spark plug is loose or defective - Tighten or replace spark plug.
Worn, stuck, or burned valves - Change or clean valves.
Sleeve, piston, or rings are damaged - Replace faulty parts as required.
Improper valve clearance - Adjust valve clearance.
| Engine oil consumption is too high |
Gaskets or seals may be damaged - Defective components must be replaced.
Damaged valve stems or valve guides - Valves must be replaced.
Stuck or defective piston rings - Replace piston rings.
Piston or cylinder liner is scored - Inspect piston and liner, change as required.
Breather hose or pipe is plugged - Service or change.
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