4.2L Feedback Carburetor System

• Description
• Operation
  • Notes
  • Fuel Control
  • Microcomputer Control Unit
    • Notes
    • Initialization
    • Open Loop
    • Closed Loop
  • Data Sensors
    • Oxygen Sensor
    • Thermal Electric Switch (TES)
    • Coolant Temperature Switch
    • 4 in. Hg Vacuum Switch
    • 10 in. Hg Vacuum Switch
    • Wide Open Throttle Switch (WOT)
    • Engine RPM Voltage
    • Timer
  • Catalytic Converter
  • Idle Speed Control
  • Air Injection Control
  • Ignition Advance Control
• Testing
  • Diagnostic Strategy
  • Test Equipment
  • System Or Component-To-Test Menu
  • Test No 1 - Operational Test
  • Test No 2 - Initialization Test
  • Test No 3 - Open Loop Switch Test
  • Test No 4 - Closed Loop Operational Test
  • Test No 5 - Electronic Ignition Retard Test
  • Test No 6 - Oxygen Sensor And Closed Loop Test
  • Test No 7 - Downstream Solenoid Test
  • Test No 8 - Upstream Solenoid Test
  • Test No 9 - Idle Speed Control System Test
  • Test No 10 - SOLVAC Vacuum Switching Solenoid Test
  • Test No 11 - SOLVAC Idle Speed Relay Test
  • Test No 12 - Basic Engine Test
• Removal & Installation
  • Microcomputer Control Unit (MCU)
    • Removal & Installation
  • Stepper Motor
    • Notes
    • Removal & Installation
  • Oxygen Sensor
    • Removal & Installation
• Wiring Diagrams