GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 4WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Exhaust Gas Recirculation Valve Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.

    2. Object Number: 281851 Size: SH
  2. Disconnect the IAT and MAF sensor harness connectors.

    3. Object Number: 281852 Size: SH
  3. Remove the air cleaner cover by releasing the retainer clips.

    4. Object Number: 315353 Size: SH
  4. Remove the air intake tube and MAF sensor by loosening the hose clamp.
  5. Move the air inlet tube aside.

    6. Object Number: 281993 Size: SH

    Important: Note the EGR valve facing before removing the EGR valve.

  6. Disconnect the EGR valve harness connector.

    7. Object Number: 22075 Size: SH
  7. Remove the EGR flange bolts.

    8. Object Number: 22078 Size: SH
  8. Remove the EGR valve and gasket.

Installation Procedure

    Object Number: 22078 Size: SH

    Important: Ensure the EGR valve is oriented in the proper direction.

  1. Place the EGR gasket between the EGR valve and the intake manifold EGR mounting location.

    2. Object Number: 22075 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Insert the flange bolts through the EGR valve and gasket into the mounting holes.

    3. Tighten
    First tighten the bolts to 10 N·m (89 lb in), and then tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 281993 Size: SH
  3. Connect the EGR valve harness connector.

    4. Object Number: 315353 Size: SH
  4. Connect the air cleaner outlet and the MAF sensor.

    5. Tighten
    Tighten the hose clamp to 4 N·m (31 lb in).


    Object Number: 281852 Size: SH
  5. Install the air cleaner cover.

    6. Object Number: 281851 Size: SH
  6. Connect the IAT and MAF sensor harness connectors.
  7. Connect the negative battery cable.