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Poor Fuel Economy: Troubleshooting

WARNING: This page is about a different car, the 2008 Suzuki Reno, 2008 Suzuki Forenza, 2007 Suzuki Reno, and 2007 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING CHART

Step Action Value (s) Yes No
1 Were the Important Preliminary Checks performed? - Go to Step 2 Go to "IMPORTANT PRELIMINARY CHECKS " in
2
  1. Inspect the air filter for excessive contamination.
  2. Inspect for fuel system leaks.

Are all needed checks complete?		 - Go to Step 3 -
3
  1. Inspect the spark plugs for excessive wear, insulation cracks, improper gap, or heavy deposits.
  2. Replace any faulty spark plugs.
  3. Inspect the ignition wires for cracking, hardness, and proper connections.

Are all needed checks and repairs complete?		 - Go to Step 4 -
4
  1. Inspect the engine coolant level.
  2. Check the thermostat for being always open or for an incorrect heat range.
  3. Replace the thermostat as needed.

Are all needed checks and repairs complete?		 - Go to Step 5 -
5
  1. Check the transaxle shift pattern. Ensure all transaxle gears are functioning.
  2. Check for proper calibration of the speedometer.
  3. Check the brakes for dragging.
  4. Check the cylinder compression.
  5. Repair, replace or adjust any components as needed.

Are all checks and needed repairs complete?		 - System OK -
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