Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSOLDSMOBILE1987CUTLASS CIERA V6-231 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESDIAGNOSIS BY SYMPTOMPOOR FUEL ECONOMY
1987 Oldsmobile Cutlass Ciera V6-231 3.8L
Poor Fuel Economy
1987 Oldsmobile Cutlass Ciera V6-231 3.8LSECTION 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.
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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.