Poor Fuel Economy

DEFINITION
Fuel economy, as measured by an actual road test, is noticeably lower than expected. Also, economy is noticeably lower than it was on this vehicle at one time, as previously shown by an actual road test

PRELIMINARY CHECKS
^ Perform the careful visual/physical checks as described in "PRELIMINARY CHECKS". Preliminary Checks
^ Visually (physically) check vacuum hoses for splits, kinks, and proper connections as shown on "Vehicle Emission Control Information" label.
^ Check owner's driving habits.
- Is A/C "ON" full time (Defroster mode "ON")?
- Are tires at correct pressure?
- Are excessively heavy loads being carried?
- Does driver accelerate hard often?

^ Check air cleaner filter for dirt or being plugged.

IGNITION SYSTEM
^ Check ignition timing.
^ Check Spark plugs. Remove spark plugs, check for wet plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits. Repair or replace as necessary.

COOLING SYSTEM
^ Check engine coolant level
^ Check engine thermostat for faulty part (always open) or for incorrect heat range.

ENGINE MECHANICAL
^ Perform cylinder compression test.

FUEL SYSTEM
^ Fuel pressure.Refer to "DIAGNOSTIC CHARTS / A-CHARTS / CHART A-7" A - Charts