LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volkswagen >> 1990 >> Vanagon Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (EGR)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Exhaust Gas RECIRCULATION (EGR)

  1. With engine idling, apply about 12 in. Hg to EGR valve with a hand-held vacuum pump. Engine should run rough or stall. If idle does not change, remove EGR valve and inspect for restricted port passage. Clean as required.
  2. If port is clean, apply about 12 in. Hg to EGR valve with vacuum pump. If valve does not move, replace EGR valve. If valve moves, go to next step.
  3. Install EGR valve and new gasket. Connect vacuum gauge to EGR vacuum line with a "T" fitting. Start engine and increase engine speed to about 3000 RPM. Vacuum gauge should indicate vacuum. If okay, test is complete. If not okay, vacuum source is plugged. Repair as necessary and repeat test.
scientia non olet · About LEMON Manuals