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 MANUALSFORD1991CLUB WAGON E250, 7.3 MREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS
1991 Ford Club Wagon E250, 7.3 M
Engine Controls - System/Component Tests
1991 Ford Club Wagon E250, 7.3 MSECTION Engine Controls - System/Component Tests
- Introduction
- Electronic Control Assembly (ECA)
- Engine Sensors & Switches (ECA Inputs)
- Notes
- Air Charge Temperature (Act) Sensor
- Barometric Pressure Sensor (BP)
- Clutch Switch
- Cylinder Identification Sensor (CID) & Crankshaft Sensor
- Engine Coolant Temperature (ECT) Sensor
- EGR Valve Position (EVP) Sensor/EGR Vacuum Regulator (EVR) Solenoid
- Engine Rpm Sensor (RPMS)
- Fuel Injection Pump Lever (FIPL) Sensor
- Heated Exhaust Gas Oxygen (HEGO) Sensor
- Inertia Switch
- Knock Sensor (KS)
- Manifold Absolute Pressure (Map) Sensor
- Mass Airflow (MAF) Sensor
- Neutral Drive Switch (NDS) A/C Input
- Power Steering Pressure Switch (PSPS)
- Throttle Position Sensor (TP Or TPS)
- Vehicle Speed Sensor (VSS)
- Modules, Motors, Relays & Solenoids
- Fuel System
- Idle Control System
- Ignition System Identification
- TFI-IV System Ignition
- Notes
- Preliminary Check
- Test Equipment
- Diagnostic Aids
- Primary Circuit Test (Except Closed Bowl Distributor)
- Primary Circuit Test (Closed Bowl Distributor)
- TFI Module Resistance Test
- Pip Sensor/Stator Test (Except Closed Bowl Distributor)
- Pip Sensor/Stator Test (Closed Bowl Distributor)
- Coil Test
- Spark Timing Advance Test
- Dis System (2.3L Ranger)
- EDIS System (4.0L AEROSTAR, Explorer, NAVAJO & Ranger)
- Emission Systems & Sub-Systems
- Air Injection
- Air Supply Pump
- Air Silencer/Filter (Air Pump & Pulse Air Inlet)
- Air By-Pass Valve (Normally Closed)
- Air Check Valve
- Air Supply Control Valve
- Air Control Valve (Switch-Relief)
- Air Pump Resonator
- Combination Air By-Pass/Air Control Valve
- Dual Thermactor Air Control Solenoid Valve
- Thermactor Idle Vacuum (TIV) Valve
- Vacuum Control Valve (VCV)
- Electrical Vacuum Control Valve
- Vacuum Check Valve
- Vacuum Reservoir
- Pulse Air Valve
- Exhaust Gas RECIRCULATION (EGR)
- Fuel Evaporation
- Positive Crankcase Ventilation (PCV)
- Thermostatic Air Cleaner (TAC)
- Air Injection
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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.