Kohler ECH749 Troubleshooting
| Engine Model: Kohler Command Pro ECH749 EFI |
| Engine Type: 4-cycle V-Twin cylinder horizontal 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 won't start or hard to start |
No fuel in fuel tank - Add gasoline.
Incorrect fuel grade - Change fuel.
Air trapped in fuel system - Bleed air.
Disconnected or loose spark plug wire - Inspect the spark plug wire connection, replace or repair.
Spark plug is faulty - Spark plug need to be replaced.
Fuel filter is plugged - Fuel filter needs changing.
Safety contact for brake pedal defective - Install new part.
Crankshaft position sensor is faulty or loose - Install new crankshaft position sensor.
Improper setting or defective throttle position sensor - Adjust or replace throttle position sensor.
Low system voltage - Defective voltage regulator, change it.
Clogged or damaged fuel injectors - Check fuel injectors and change if required.
Fuel lines are dirty - Fuel lines must be clean.
Low cylinder compression - Check cylinder block and replace worn parts.
Improperly adjusted or worn throttle cable - Change cable or adjust properly.
Plugged cooling fins - Clean and wash as required.
Defective ignition system - Inspect ignition system and change faulty parts.
Choke cable is stuck or defective - Clean or replace the cable.
Clogged air filter - Replace or service air filter.
Dirty or faulty fuel pump - Clean or change fuel pump.
Fuel injectors are damaged or dirty - Inspect fuel injectors and change as required.
Fuel lines clogging - Clean fuel system lines.
Incorrectly adjusted or faulty throttle position sensor - Adjust or change throttle position sensor.
| Engine starts and stalls immediately |
Faulty spark plug - Spark plug need to be replaced.
Ignition coil is faulty - Ignition coil must be replaced.
Worn or loose valve springs - Change valve springs.
Valves are stuck - Valves need to be cleaned.
Fuel filter is dirty - Fuel filter needs to be replaced.
Plugged air filter - Clean or change air filter.
Fuel lines are clogged - Clean fuel lines.
Fuel injectors are defective or dirty - Check fuel injectors and replace if necessary.
Wrong governor setting - Governor needs to be set properly.
Low engine oil level - Check oil level and add oil as required.
Engine is overloaded - Load reducing required.
Cooling fins are blocked - Need to wash or clean.
Ignition timing is wrong - Ignition timing needs to be set properly.
Valve setting is wrong - Adjust valves correctly.
Stale fuel - Change gasoline.
Engine is under excessive load - Reduce engine load.
Engine oil level is low - Fill the crankcase with engine oil.
Incorrectly adjusted low idle speed - Adjust idling as required.
Dirty or faulty fuel pump - Clean or change fuel pump.
Main bearings or crankshaft are worn out - Repair or replace defective parts.
Excessive valve clearance - Adjust valve clearance.
Piston rings or cylinder bore are damaged - Change faulty components.
Air filter is blocked - Replace or clean air filter.
Dirty or damaged fuel pump - Service or change fuel pump.
Clogged fuel lines - Clean fuel system lines.
Governor adjustment is incorrect - Set governor correctly.
Faulty one fuel injector - Install new fuel injector.
Ignition system malfunction - Check ignition and replace faulty components.
Damaged cylinder-head gasket - Cylinder-head gasket replacement required.
Valves are burned or stuck - Replace or clean valves.
Worn or bent push rod - Change push rod.
Cylinder block parts are worn out - Change defective parts.
Dirty oil filter element - Clean or replace oil filter.
Throttle opening is not full - Adjust or change throttle cable.
Dirty or faulty fuel injectors - Clean or change fuel injectors.
Spark plug is loose or faulty - Change or re-tighten spark plug.
Burned, worn, or stuck valves - Replace or service valves.
Rings, sleeve, or piston are damaged - Change defective components.
Valve clearance is improper - Need to adjust valve clearance.
| Excessive oil consumption |
Gaskets or seals can be faulty - To repair leaks, replace worn parts.
Worn valve guides and valve stems - Need to replace the valves.
Damaged or seized piston rings - Change the piston rings as required.
Worn cylinder liner or piston - Inspect piston and liner, fit new components as necessary.
Blocked breather hose or pipe - Service or replace.
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