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Home >> Chevrolet >> 2004 >> Chevy Express G2500, Van Cargo Extended, 4.3 X, 4L60E/M30 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.3L (Introduction) >> Repair Instructions >> Exhaust Gas Recirculation (EGR) System Cleaning

Exhaust Gas Recirculation (EGR) System Cleaning

CAUTION: Avoid breathing fumes and swallowing EGR exhaust deposits when removing components for cleaning as bodily injury may result.
    Fig 1: View Of Linear EGR Valve
    GM22078Courtesy of GENERAL MOTORS CORP.
  1. Remove the exhaust gas recirculation (EGR) valve. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .
  2. Press the pintle several times using a pencil eraser or other suitable soft instrument. The pintle should move in and out smoothly. Replace the valve if the valve exhibits tendencies to stick.
  3. Try to rotate the EGR valve electrical connector housing. Repeat for the coil housing. Replace the valve if the valve exhibits any looseness.
    4. NOTE: Damage to the powdered metal EGR valve base occurs if cleaned with a wire brush, a wire wheel, solvents, sharp tools, or sand blasting. Cleaning by these methods is not recommended.
  4. Inspect the EGR valve pintle and seat for deposits. Use a cloth or other suitable soft device to remove the deposits. Remove all loose particles. Replace the valve if the deposits are such that the pintle to base interface cannot be cleaned adequately to allow the pintle to seal against the seat.
    5. Fig 2: View Of EGR Pipe
    GM486681Courtesy of GENERAL MOTORS CORP.
  5. Remove the EGR pipe. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .
  6. Clean the passages with a wire brush. Remove all loose particles.
  7. Install the EGR pipe. Refer to Exhaust Gas Recirculation (EGR) Pipe Replacement .
  8. Install the EGR valve. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .
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