LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saab >> 1978 >> 99 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> EGR Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

EGR Valve

  1. Remove vacuum hose connecting EGR valve to PVS valve. Apply a vacuum of at least 4 in. Hg to EGR valve, then release vacuum. Valve should close. If not, remove valve for inspection. Faulty EGR valves should be replaced.
  2. Connect a vacuum pump and gauge to EGR valve. Check reading at which valve starts to open (valve stem is visible in opening between diaphragm housing and valve body). Valve should start to open at 2.2-2.6 in. Hg.
scientia non olet · About LEMON Manuals