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Home >> Buick >> 2005 >> LeSabre Limited, 4T65E/MN3 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction >> Repair Instructions >> Exhaust Gas Recirculation (EGR) System Cleaning

Exhaust Gas Recirculation (EGR) System Cleaning

    Fig 1: Removing/Installing Identifying EGR Valve & Components
    GM12312Courtesy of GENERAL MOTORS CORP.
  1. Remove the exhaust gas recirculation (EGR) valve (1). Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .
  2. Depress 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 Valve Adapter Assembly
    GM36667Courtesy of GENERAL MOTORS CORP.
  5. Remove the EGR pipes. Refer to Exhaust Gas Recirculation (EGR) Inlet Pipe Replacement  and Exhaust Gas Recirculation (EGR) Outlet Pipe Replacement .
  6. Clean the passages with a wire brush. Remove all loose particles.
  7. Install the EGR pipes. Refer to Exhaust Gas Recirculation (EGR) Inlet Pipe Replacement  and Exhaust Gas Recirculation (EGR) Outlet Pipe Replacement .
  8. Install the EGR valve. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .
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