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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests - 4.3L. >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (C-7) >> System Test (Vacuum-Controlled Valve)
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System Test (Vacuum-Controlled Valve)

Start and run engine to normal operating temperature. With engine at idle, RPM should drop as EGR valve is opened by pushing up on underside of EGR diaphragm.

CAUTION: Wear gloves when handling hot EGR valve.
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