L-Jetronic

The Bosch L-Jetronic (also called AFC=Air Flow Controlled fuel injection) was put into US-spec Type 4s in the last model year (1974). While new carburated engines were used in the European markets, VW adapted the L-Jetronic for the Type 4 in the US due to more stringent emissions and fuel consumption regulations.

Contents

• Introduction
  • How to use this manual
  • Tool list
  • Fuel system description
  • Wiring diagram
  • Vacuum hose diagram
• Troubleshooting
  • Starter works but engine does not start
  • Engine starts but then dies
  • Rough idle, idle speed and exhaust test
  • Fuel not accepted smoothly
  • Consistent engine misses
  • High fuel consumption
  • No maximum power
• Components
  • Component test instructions
• Test chart
  • Voltage Supply
  • Air Flow Meter
  • Throttle Valve Switch
  • Fuel Pump, Pressure Regulator and Relay
  • Temperature Sensor
  • Injectors
  • Cold Start Valve
  • Thermo-Time Switch
  • Altitude Compensator