Kohler CH735 EFI Troubleshooting
| Engine Model: Kohler Command Pro CH735 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 starts hard or will not start |
Gas tank is empty - Add fuel.
Incorrect fuel grade - Change gasoline.
Air in the fuel pipes - Bleed the fuel pipes.
Spark plug wire is loose or disconnected - Inspect the spark plug wire connection, replace or repair.
Spark plug is defective - Change spark plug.
Dirty fuel filter - Replace fuel filter.
Brake pedal not depressed - Press the brake pedal.
Crankshaft position sensor is faulty or loose - Change crankshaft position sensor.
Throttle position sensor malfunction or improper setting - Throttle position sensor must be adjusted or replaced.
System voltage is low - Defective voltage regulator, change it.
Fuel injectors are damaged or dirty - Test fuel injectors and change if necessary.
Restricted fuel lines - Clean fuel lines.
Bad compression - Check and change damaged parts.
Incorrectly adjusted or damaged throttle cable - Change cable or adjust properly.
Clogged cooling fins - Need to clean or wash.
Ignition system malfunction - Check ignition and replace faulty components.
Throttle cable is defective or stuck - Service or replace the cable.
Plugged air filter - Replace or service air filter.
Fuel pump is dirty or defective - Clean or install new fuel pump.
Fuel injectors are clogged or faulty - Service or replace fuel injectors.
Dirt in the fuel lines - Clean fuel lines.
Throttle position sensor damaged or incorrectly adjusted - Adjust or replace throttle position sensor.
| Engine stalls after starting |
Faulty spark plug - Install new spark plug.
Ignition coil is not working - Ignition coil should be replaced.
Valve springs are weak or broken - Change valve springs.
Stuck valves - Service the valves.
Fuel filter is clogged - Replace fuel filter.
Air filter is dirty - Service or replace air filter.
Fuel lines are clogged - Clean fuel system lines.
Clogged or damaged fuel injectors - Test fuel injectors and change if necessary.
Governor setting is improper - Governor needs to be adjusted correctly.
Engine oil insufficient - Add oil to the engine crankcase.
Engine is under excessive load - Load reducing is recommended.
Plugged cooling fins - Clean and wash as required.
Bad ignition timing - Ignition timing needs to be set properly.
Wrong valve setting - Valves needs to be adjusted properly.
Stale gasoline - Use correct fuel.
Engine is overloaded - Reduce the load.
Lack of engine oil - Fill up the oil to required level.
Low idle speed setting is incorrect - Adjust as required.
Fuel pump is damaged or dirty - Test fuel pump and change if necessary.
Crankshaft or main bearings are worn out - Repair or replace defective parts.
Valve clearance is not correct - Adjustment procedure required.
Worn piston rings or cylinder bore - Replace defective components.
Air filter element is plugged - Service or change air filter.
Dirty or damaged fuel pump - Check fuel pump and replace if necessary.
Clogged fuel lines - Clean fuel lines.
Improper governor adjustment - Adjust governor correctly.
Defective one fuel injector - Install new fuel injector.
Defective ignition system - Check ignition system and replace faulty parts.
Cylinder head gasket is damaged - Replace cylinder head gasket.
Stuck or burned valves - Service or replace valves.
Push rod is bent or worn - Install a new push rod.
Faulty cylinder block parts - Replace defective parts as required.
Oil filter is blocked - Change or service oil filter.
| Engine uses too much fuel |
Choke doesn't open well - Adjust or replace choke cable.
Dirty or faulty fuel injectors - Check fuel injectors and change if required.
Faulty or loose spark plug - Tighten or change the spark plug.
Stuck, burned, or worn valves - Replace or service valves.
Sleeve, rings, or piston are damaged - Change faulty parts.
Valve clearance is improper - Adjustment procedure required.
Gaskets or seals can be faulty - Replace to repair leaks.
Worn valve guides and valve stems - Install new valves.
Damaged or seized piston rings - Change piston rings.
Cylinder liner or piston is worn - Inspect piston and liner, replace as required.
Blocked breather pipe or hose - Replace or service.
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