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Home >> Jeep >> 1990 >> Wrangler Laredo, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - CARBURETED >> Exhaust Gas RECIRCULATION (EGR) System >> System Test
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System Test

  1. Bring engine to normal operating temperature and curb idle. Apply manifold vacuum (or an outside source of at least 12 in. Hg) directly to nipple on EGR valve and note engine idle.
  2. Engine should idle roughly or stall. If this occurs, valve and EGR passages are okay. Proceed to testing of individual components. If idle did not change, remove EGR valve and inspect valve and exhaust passage in manifold for blockage. If no blockage is present, replace EGR valve.
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