Kohler KG2204, Сервисная инструкция

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50 Fuel System Troubleshooting TP-6903 5/16a
3.4. Hard Start
Definition:
The engine cranks but does not start for a
long time. The engine does eventually run, or may start
but immediately stalls.
Figure 3-6 Hard Start Troubleshooting
Checks Action
Preliminary Checks

Make sure the engine’s operator is using the correct starting procedure.
Sensor Checks

Check the coolant temperature sensor with Spectrum. Compare the engine coolant
temperature with the ambient air temperature on a cold engine. If the coolant
temperature reading is more than 10 degrees greater or less than the ambient air
temperature on a cold engine, check for high resistance in the coolant sensor circuit.

Check the crankshaft position sensor.

Check the electronic throttle connections.
Fuel System Checks
Note:
A partially closed fuel supply valve will create an extended crank or no start
condition.

Check the air-fuel mixer assembly for proper installation and leakage.
o
Verify proper operation of the fuel shut-off solenoid valves.
o
Verify proper operation of the system fuel pressure regulator.
o
Check for air intake system leakage between the air-fuel mixer, throttle body and air
filter assembly. Check the fuel system pressures.
Ignition System Checks
Note:
Natural Gas and Liquefied Petroleum Gas require higher secondary ignition system
voltages than the equivalent gasoline operating conditions.

Check for the proper ignition voltage output.

Verify that the spark plugs are the correct type and properly gapped.

Check the spark plugs for the following conditions:
o
Wet plugs (oil fouling).
o
Cracks.
o
Wear.
o
Burned electrodes.
o
Heavy deposits.

Check for bare or shorted ignition leads.

Check for loose ignition coil connections.

If the engine starts but then immediately stalls, check the crankshaft position sensor.

Check for improper gap, debris or faulty connections.
Engine Mechanical Checks

Check for the following:
o
Engine vacuum leaks.
o
Manifold vacuum leaks.
o
Charge air cooler leaks on turbocharged engines.
o
Mixer vacuum leaks.
o
Improper valve timing.
o
Low compression.
o
Improper valve clearance.
o
Worn rocker arms.
o
Broken or weak valve springs.
o
Worn camshaft lobes.
Exhaust System Checks

Check the exhaust system for a possible restriction:
o
Inspect the exhaust system for damaged or collapsed pipes.
o
Inspect the muffler for signs of heat distress or for possible internal failure.

Check that the turbocharger turbine and compressor blades do not rub or bind against
the turbocharger housing.