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 MANUALSFORD1992TEMPO L4-140 2.3L HSCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESPOOR FUEL ECONOMY
1992 Ford Tempo L4-140 2.3L HSC
Poor Fuel Economy
1992 Ford Tempo L4-140 2.3L HSCSECTION 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 car at one time, as previously shown by an actual road test.
POSSIBLE CAUSE ACTION
Dirty air filter element - Clean or replace air filter element
Fuel Metering - Check air/fuel ratio, (O2 Sensor Voltage)
- Perform CYLINDER BALANCE TEST
- Check vacuum line and return hose
- Check fuel pressure
Air Induction - Check for air cleaner duct and valve door stuck in the "hot air" position, IA4 - Air Cleaner Duct and Valve System Diagnosis
- Check bimetal sensor operation, IA2 - Air Cleaner Temperature (BI-Metal) Sensor Diagnosis
- Check for restricted air filter element, IA3 - Air Cleaner Filter Element Diagnosis
Speedometer inaccurate - Check speedometer calibration.
POSSIBLE CAUSE ACTION
Dirty air filter element - Clean or replace air filter element
Fuel Metering - Check air/fuel ratio, (O2 Sensor Voltage)
- Perform CYLINDER BALANCE TEST
- Check vacuum line and return hose
- Check fuel pressure
Air Induction - Check for air cleaner duct and valve door stuck in the "hot air" position, IA4 - Air Cleaner Duct and Valve System Diagnosis
- Check bimetal sensor operation, IA2 - Air Cleaner Temperature (BI-Metal) Sensor Diagnosis
- Check for restricted air filter element, IA3 - Air Cleaner Filter Element Diagnosis
Speedometer inaccurate - Check speedometer calibration.
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.