Kohler ECV749 Troubleshooting
| Engine Model: Kohler Command Pro ECV749 EFI |
| Engine Type: 4-cycle V-Twin cylinder vertical shaft air-cooled gasoline |
| Total Displacement: 45.6 cu.in (747 cc) |
| Rated Engine Power: 26.5 Hp (19.8 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 - Fill gasoline up.
Wrong fuel grade - Change gasoline.
Air in the fuel pipes - Bleed the fuel pipes.
Spark plug wiring connection is damaged - Check spark plug wiring connection, repair or change.
Spark plug is defective - Change spark plug.
Dirty fuel filter - Change fuel filter.
Defective safety switch - Replace if required.
Loose or defective crankshaft position sensor - Replace as required.
Throttle position sensor malfunction or improper setting - Throttle position sensor must be adjusted or replaced.
Lack of system voltage - Defective voltage regulator, change it.
Clogged or damaged fuel injectors - Clean or replace fuel injectors.
Fuel lines clogging - Fuel lines need to be cleaned.
Poor engine compression - Check cylinder block and replace damaged components.
Damaged or incorrectly adjusted choke cable - Change cable or adjust properly.
Air intake screen is plugged - Need to wash or clean.
Defective ignition system - Inspect ignition system and change failed components.
Faulty or stuck throttle cable - Service or change the cable.
Air filter element is plugged - Change or service air filter.
Clogged or defective fuel pump - Test fuel pump and replace if necessary.
Fuel injectors are dirty or defective - Service or change fuel injectors.
Fuel lines clogging - Fuel lines must be clean.
Faulty or incorrectly adjusted throttle position sensor - Adjust or change throttle position sensor.
| Engine starts and stops suddenly |
Spark plug is defective - Replace spark plug.
Ignition coil is damaged - Install a new ignition coil.
Broken or bad valve springs - Replace valve springs.
Valves are stuck - Valves need to be cleaned.
Plugged fuel filter - Install new filter.
Plugged air filter - Service or change air filter.
Fuel lines clogging - Clean fuel lines.
Dirty or damaged fuel injectors - Check fuel injectors and change if required.
Improper governor setting - Adjust governor as required.
Not enough engine oil - Check oil level and add oil as required.
Engine is under excessive load - Load reducing required.
Cooling fins are clogged - Wash or clean as required.
Improper ignition timing - Adjust ignition timing correctly.
Wrong valve setting - Set the valves correctly.
| Engine knocking sound or abnormal noise |
Stale fuel - Use correct gasoline.
Excessive engine load - Load reducing required.
Not enough engine oil - Fill up the oil to required level.
Too low idle RPM - Adjustment required.
Fuel pump is defective or dirty - Clean or install new fuel pump.
Worn main bearings or crankshaft - Install new parts as as required.
Improper valve clearance - Adjustment procedure required.
Worn piston rings or cylinder bore - Replace faulty parts.
Dirty air filter element - Change or service air filter.
Clogged or defective fuel pump - Service or replace fuel pump.
Fuel lines are clogged - Clean fuel system lines.
Wrong governor adjustment - Governor needs to be adjusted correctly.
One fuel injector failure - Install new fuel injector.
Ignition system is defective - Check ignition system and replace faulty parts.
Cylinder head gasket is defective - Replace cylinder head gasket.
Burned or stuck valves - Service or change valves.
Push rod is damaged or worn - Install a new push rod.
Cylinder block parts are faulty - Replace defective parts as required.
Oil filter is blocked - Replace or clean oil filter.
| Excessive fuel consumption |
Throttle is not fully open - Change or adjust throttle cable.
Fuel injectors are defective or dirty - Check fuel injectors and change if required.
Defective or loose spark plug - Replace or tighten spark plug.
Valves are stuck, burned, or worn - Replace or service valves.
Sleeve, rings, or piston are damaged - Change faulty parts.
Valve clearance is wrong - Adjust valve clearance.
| Excessive engine oil consumption |
Gaskets or seals may be damaged - Replace worn parts to avoid leaks.
Valve guides or stems are damaged - Replace defective valves.
Worn or broken piston rings - Have piston rings replaced.
Scuffed piston or cylinder liner - Check liner and piston, install new components as required.
Blocked breather pipe or hose - Clean or replace.
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