GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Eighty Eight 🢒 Engine 🢒 Engine Electrical 🢒 Spark Plug Replacement

Removal Procedure
  1. Remove the injector sight shield.

    2. Important: Do not remove the spark plugs when the engine is warm.

    Clean any dirt or debris from the spark plug base area.


    Object Number: 166819 Size: SH
  2. Twist the spark plug boots ½ turn and remove the spark plug wires from the spark plugs.

    3. Object Number: 166820 Size: SH
  3. Remove the spark plugs from the engine.

Installation Procedure

    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.


    Object Number: 166820 Size: SH
  1. Install the spark plugs into the engine. Refer to Spark Plug Usage for the proper spark plug usage.

    2. Tighten
    Tighten the spark plugs to 15N·m (11 lb ft).

    Important: Some engines use aluminum heat shields over the spark plug boots on cylinders which have spark plugs close to the exhaust system. Care should be taken to ensure that these shields are placed in the proper locations and fully seated.

  2. Install the spark plug wires over the spark plugs.
  3. Install the injector sight shield.