Poor Fuel Economy - Kohler KG2204 Service

3.9. Poor Fuel Economy

Definition: Fuel economy, as measured by refueling
records, is noticeably lower than expected. Also, the
economy is noticeably lower than it was on this engine
at one time, as previously shown by refueling records.
Checks
Preliminary Checks
Fuel System Checks
Sensor Checks
Ignition System Checks
Cooling System Checks
Figure 3-11 Poor Fuel Economy Troubleshooting
TP-6903 5/16a
Action
 Check the air cleaner element (filter) for dirt or being plugged.
 Visually check the vacuum hoses for splits, kinks, and proper connections.
 Check that the fuel pressure regulator is functioning properly.
 Check the fuel system for leakage.
 Check the TMAP sensor.
 Verify that the spark plugs are the correct type and properly gapped.
 Remove the plugs and inspect them for the following conditions:
o Wet plugs (oil fouling).
o Cracks.
o Wear.
o Improper gap.
o Burned electrodes.
o Heavy deposits.
 Check the ignition leads for the following items:
o Cracking.
o Hardness.
o Proper connections.
Check the engine thermostat to see if it is stuck open or for the wrong heat range.
Fuel System Troubleshooting 55