Poor Fuel Economy

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

IGNITION SYSTEM
CHECK: Ignition timing. Refer to "Vehicle Emission Control Information" label.
CHECK: Spark Plugs. Remove Spark Plugs, check for wet Plugs, cracks, wear, improper gap, burned Electrodes, or heavy deposits. Repair or replace as necessary.

PRELIMINARY CHECKS
Perform the careful Visual/Physical Checks as described in Preliminary Checks. Preliminary Checks

CHECK: Visually (physically): 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?
- Is acceleration too much, too often?
CHECK Air Cleaner Filter for dirt or blockage.

COOLING SYSTEM
CHECK: Engine Coolant level.
CHECK: Engine Thermostat for faulty part (always open) or for wrong heat range.

ENGINE MECHANICAL
CHECK: Compression.