Kohler CH26 EFI Troubleshooting
| Engine Model: Kohler Command Pro CH26 EFI |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 44 cu.in (725 cc) |
| Rated Engine Power: 26 Hp (19.4 kW) at 3600 rpm |
| Fuel System Type: Electronic fuel injection (EFI) |
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| Engine hard starting or not starting |
Empty gas tank - Add gasoline.
Wrong fuel grade - Use quality fuel.
Clogged fuel system - Remove clogging.
Damaged spark plug wiring connection - Check the spark plug wire connection, repair or replace.
Faulty spark plug - Spark plug need to be replaced.
Plugged fuel filter - Fuel filter needs to be replaced.
Faulty safety switch - Change damaged switch.
Loose or damaged crankshaft position sensor - If necessary, replace crankshaft position sensor.
Incorrectly adjusted or faulty throttle position sensor - Replace or adjust throttle position sensor.
Low system voltage - Check voltage regulator and replace if required.
Clogged or damaged fuel injectors - Service or replace fuel injectors.
Dirty fuel lines - Clean fuel system lines.
Poor cylinder compression - Check cylinder block and change worn parts.
Not adjusted or damaged throttle cable - Replace cable or adjust properly.
Cooling fins are clogged - Clean and wash as required.
Ignition system failure - Inspect ignition system and change faulty parts.
Stuck or faulty throttle cable - Service or change the cable.
Air filter is dirty - Replace or clean air filter.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Fuel injectors are faulty or clogged - Test fuel injectors and replace if necessary.
Clogged fuel lines - Clean fuel system lines.
Improper setting or defective throttle position sensor - Set throttle position sensor or change it.
| Engine stops after starting |
Spark plug is damaged - Replace spark plug.
Ignition coil is damaged - Replace ignition coil as necessary.
Valve springs are loose or broken - Replace valve springs.
Valves are stuck - Valves must be cleaned.
Clogged fuel filter - Change fuel filter.
Air filter is blocked - Service or change air filter.
Clogged fuel lines - Fuel lines need to be cleaned.
Dirty or defective fuel injectors - Clean or change fuel injectors.
Incorrect governor setting - Set governor correctly.
Insufficient engine oil - Check oil level and add oil as required.
Engine overload - Load reducing required.
Air intake screen is blocked - Wash or clean as required.
Improper ignition timing - Adjust ignition timing as required.
Improper valve setting - Adjust valves as required.
Low octane fuel - Use proper gasoline.
Engine is running overloaded - Load reducing is recommended.
Insufficient engine oil - Fill the crankcase with engine oil.
Wrong adjustment of low idle speed - Need to adjust idle speed.
Dirty or defective fuel pump - Clean or change fuel pump.
Worn crankshaft or main bearings - Change defective components as required.
Incorrect valve clearance - Adjust to proper valve clearance.
Damaged piston rings or cylinder bore - Change faulty parts.
Clogged air filter - Change or clean air filter.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Dirty fuel lines - Clean fuel system lines.
Wrong governor adjustment - Governor needs to be set properly.
One fuel injector failure - Replace fuel injector.
Ignition system problems - Test ignition and replace failed parts.
Cylinder head gasket is defective - Cylinder-head gasket replacement required.
Valves are burned or stuck - Change or clean valves.
Worn or defective push rod - Push rod needs to be changed.
Cylinder block components are damaged - Defective components need to be replaced.
Clogged oil filter - Replace or service oil filter.
| Excessive fuel consumption |
Throttle is not fully open - Change or adjust throttle cable.
Dirty or damaged fuel injectors - Clean or change fuel injectors.
Spark plug is defective or loose - Re-tighten or change the spark plug.
Valves are worn, burned or stuck - Service or change valves.
Worn sleeve, rings, or piston - Replace defective parts as required.
Valve clearance is wrong - Adjust to proper valve clearance.
| Engine consuming too much oil |
Worn seals or gaskets - Install new components.
Valve guides and stems are worn - Replace the valves.
Seized or wear piston rings - Have piston rings replaced.
Damaged piston or cylinder liner - Check liner and piston, install new components as required.
Breather pipe or hose is plugged - Service or replace.
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