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Home >> Pontiac >> 1985 >> Fiero L4-151 2.5L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> - Diagnosis By Symptom >> Poor Fuel Economy

Poor Fuel Economy

1. Faulty engine thermostat or improper heat range application.
2. Improper fuel pressure. See chart A-5
3. Check driving habits.
a. A/C on full time.
b. Incorrect tire pressures.
c. Excessively heavy loads being carried.
d. Excessive acceleration.
4. Air cleaner element dirty.
5. Improperly calibrated speedometer.
6. Vacuum hoses split, kinked or improperly connected.
7. Faulty spark plug wires.
8. Improper ignition timing.
9. Faulty spark plugs.
10. Improper compression.
11. Brakes dragging.
12. Restricted exhaust system.