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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATION - EEC-IV
1991 Mercury Tracer Base, 4D Sedan, Automatic
Engine Controls - Theory & Operation - EEC-IV
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Engine Controls - Theory & Operation - EEC-IV
- Introduction
- Air Induction System
- Computerized Engine Controls
- Control Unit
- Input Devices
- Notes
- Air Charge Temperature (ACT) Sensor
- Barometric Pressure (BP) Sensor
- Brake On-Off (BOO) Switch
- Camshaft Sensor
- Clutch Engage Switch
- Coolant Temperature Sensor
- Crankshaft Angle Sensor
- Cylinder Identification (CID) Sensors
- Exhaust Gas Oxygen (EGO) Sensor
- EGR Valve Position (EVP) Sensor
- Engine Coolant Temperature (ECT) Sensor
- Heated Exhaust Gas Oxygen (HEGO) Sensor
- Knock Sensor (KS)
- Manifold Absolute Pressure (MAP) Sensor
- Mass Airflow (MAF) Sensor
- Neutral Gear Switch (NGS)
- Power Steering (P/S) Pressure Switch
- Self-Test Output/Self-Test Input (STO/STI) Connectors
- Throttle Position Sensor (TPS)
- Vehicle Speed Sensor (VSS)
- Output Signals
- Fuel System
- Ignition Systems
- Emission Systems
- Notes
- Vacuum
- Air Injection System
- Notes
- Pulse Air Valve System
- Thermactor Air System
- Anti-Backfire (Gulp) Valve
- Air By-Pass Valve
- Air Check Valve & Pulse Air Valve
- Air Pump
- Air Silencer/Filter
- Air Supply Control Valves
- Check Valves
- Combination Air By-Pass & Air Control Valve
- Dual Thermactor Air Control Solenoid Valve
- Thermactor Idle Vacuum (TIV) Valve
- EGR System
- Evaporative Emission System
- Positive Crankcase Ventilation (PCV)
- Self-Diagnostic System
- Miscellaneous Controls
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.