1990 Volkswagen Vanagon Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Lacks Power

  • Test coolant temperature sensor and wiring. Repair or replace as required.
  • Check fuel system and control system pressure. Replace pressure regulator if necessary.
  • Check throttle cable adjustment.
  • Check throttle switch. Adjust or replace as necessary.
  • Check airflow sensor screen for damage or incorrect installation (if equipped).
  • Check ignition timing and knock sensor control (if equipped). Adjust as necessary.
  • Check EGR system for correct operation (if equipped).
  • Ensure base timing is correct and timing advance system is functional.
  • Check transmission for correct downshift (auto. trans.)
  • Check fuel tank filler tube for tampering of restrictor. If tampering has occurred, check catalytic converter for lead contamination and exhaust system restriction.
  • Check for use of poor quality fuel containing insufficient cleaning additives. Prolonged use of poor quality fuel can cause injector clogging and carbon build-up on intake system.
  • Inspect intake air element, housing, and preheating system.
  • Check airflow sensor plate movement. Replace if necessary.
Factory Service Tools

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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.