Lack Of Power Or Sluggishness - Kohler KG2204 Service

3.8. Lack of Power or
Sluggishness
Definition: The engine delivers less than expected
power. There is little or no increase in speed when
increasing the engine throttle.
Checks
Preliminary Checks
Fuel System Checks
Sensor Checks
Exhaust System Checks
Engine Mechanical Check
Additional Check
Figure 3-10 Lack of Power or Sluggishness Troubleshooting
54 Fuel System Troubleshooting
Action
 Use Spectrum to check the ECM for stored DTC codes.
 Remove the air filter and check for dirt or restriction.
 Check for contaminated fuel or improper fuel pressure.
 Check for the proper ignition output voltage with a spark tester.
 Check the fuel pressure regulator, air-fuel mixer and throttle body for proper installation
and leakage. Check all air inlet ducts for condition and proper installation.
 Check for fuel leaks in supply lines.
 Verify that the fuel supply valve on the supply line is open.
 Check the Heated Exhaust Gas Oxygen Sensor (HEGO) for contamination and
performance.
 Check for proper operation of the TMAP sensor.
 Check the exhaust system for a possible restriction:
o Inspect the exhaust system for damaged or collapsed pipes.
o Inspect the turbocharger turbine and compressor blades for binding or wear on
turbocharged engines.
o Inspect the wastegate and wastegate linkage for sticking, binding or wear on
turbocharged engines.
o Inspect the muffler for signs of heat distress or for possible internal failure.
 Check the engine for the following:
o Engine compression.
o Valve timing.
o Improper or worn camshaft.
 Refer to Engine Service Manual.
 Check that the ECM grounds are clean, tight, and in their proper locations.
 Check the alternator output voltage.
 If all procedures have been completed and no malfunction has been found, review and
inspect the following items:
 Visually and physically, inspect all electrical connections within the suspected circuit
and/or systems.
 Check the Spectrum data.
 Check the charge air cooler for fouling on turbocharged engines.
TP-6903 5/16a