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 LX, 2.3 X, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/O CODES - EEC-IVDIAGNOSTIC CHARTSCHART 15-POOR FUEL ECONOMY

1992 Ford Tempo LX, 2.3 X, Standard

Chart 15-Poor Fuel Economy

1992 Ford Tempo LX, 2.3 X, StandardSECTION Chart 15-Poor Fuel Economy

NOTE: Fuel consumption increases drastically in city driving, short-run operation, stop-and-go driving, trailer towing, extended winter warm-up periods, etc. Determine if these are factors are the cause of poor fuel mileage before proceeding with diagnostic procedure.

DIAGNOSTIC CHART 15-POOR FUEL ECONOMY

System & Component(s)	Reference
FUEL/THROTTLE BODY Fuel Pressure Regulator Fuel Return Line Blocked	Perform a visual inspection. See FUEL SYSTEMS in I - SYS/COMP TESTS article.
AIR INTAKE SYSTEM Air Cleaner Duct & Element	See I - SYS/COMP TESTS article.
IGNITION Scope Engine For: Spark Plugs, Wires, Coil, etc. Ignition Timing	See IGNITIONS SYSTEMS in I - SYS/ COMP TESTS article.
EEC EEC-IV Quick Test	See TESTS W/CODES article.
COOLING Thermostat	Check cooling system.
FACTORS EXTERNAL TO THE ENGINE Tire Pressure Clutch Operation Converter Clutch Override Automatic Transmission Shift Pattern and Fluid Level Brake Drag Exhaust System Speedometer/Odometer Gear Ratio Axle Ration Vehicle Load Road and Weather Conditions Aftermarket Add Ons	Perform a manual & visual inspection.
BASE TRANSMISSION (A/T WITH OVERDRIVE) Converter Clutch Control Components Modulated Converter Clutch Control Solenoid	See TESTS W/CODES article.
EGR Valve Operation	See I - SYS/COMP TESTS article.

RENDER: 1.0x

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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.