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HOMESERVICE MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - INTRODUCTIONREPAIR INSTRUCTIONSEXHAUST GAS RECIRCULATION (EGR) SYSTEM CLEANING
2005 Buick LeSabre Limited, 4T65E/M15

Exhaust Gas Recirculation (EGR) System Cleaning

2005 Buick LeSabre Limited, 4T65E/M15SECTION 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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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.