GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Intrigue 🢒 Engine 🢒 Engine Electrical 🢒 Ignition Coil Replacement

Removal Procedure

    Object Number: 256277 Size: SH
  1. Remove the injector sight shield mounting nuts (2).
  2. Lift the injector sight shield off the mounting studs by lifting at the front (4) of the cover.

    3. Object Number: 256329 Size: SH
  3. Disconnect the Ignition Control Module electrical connector.
  4. Remove the seven ignition cassette to cam cover mounting bolts (2).

    5. Object Number: 256304 Size: SH
  5. Gently pry the cassette (2) away from the cam cover (3) using a screwdriver (protect finished surfaces from scratches with a shop cloth). Pry a small amount in several locations around the edge of the cassette in order to lift the assembly as evenly as possible. Do not insert the screwdriver far enough to tear the perimeter seal on the cassette.
  6. On some vehicles the oil level indicator tube may interfere with the removal of the front bank coil cassette. Remove the oil level indicator tube retaining bolt and move the oil level indicator tube if necessary.
  7. Lift the cassette straight up off of the spark plugs.

    8. Object Number: 256308 Size: SH
  8. Remove the secondary boots (3) from the spark plugs or the ignition coils using a twisting motion to break the seal. Do not use pliers, screwdrivers or any unauthorized tool to remove the boots.

Installation Procedure

Important: When servicing the ignition system components, use the following recommended procedures:

   • Do not re-install any component that has visible signs of damage.
   • Check the boots for a missing or damaged internal spring.
   • Ensure that the boots are installed right side up.
   • Ensure that the ignition cassette to cam cover ground spring (2) is in place.
   • Repair a torn perimeter seal with RTV sealant.
   • Clean all mounting surfaces before re-installing components.


    Object Number: 256308 Size: SH
  1. Install the boots (3) onto the ignition coils (until bottomed out).

    2. Object Number: 256304 Size: SH
  2. Install the cassette assembly (2) straight down onto the spark plugs.

    3. If this is not possible due to space limitations (rear bank), just-start the boots onto the spark plugs and then align and start the ignition coil towers into the boots. Press the coil assembly (2) as straight down onto the plugs as possible.


    Object Number: 256329 Size: SH
  3. Install the seven ignition cassette to cam cover mounting bolts (2).

    4. Tighten
    Tighten the mounting bolts to 9.5N·m (84 Lb. in.)

  4. Connect the Ignition Control module electrical connector.
  5. If the oil level indicator tube was moved during disassembly, move the tube back into position and install the retaining bolt.

    6. Tighten
    Tighten the retaining bolt to 9N·m (80 Lb. in.)


    Object Number: 256277 Size: SH
  6. Keeping the injector sight shield as level as possible place the rear (1) of the shield under the mounting bracket (6).
  7. Align and press the injector sight shield (4) onto the mounting studs (5).
  8. Install the mounting nuts (2) onto the mounting studs (5).

    9. Tighten
    Tighten the mounting nuts (2) to 3N·m (27 lb. in.).