GM Service Manual Online
For 1990-2009 cars only

Centering Procedure

  1. A new SIR coil assembly will come pre-centered.
  2. Hold coil assembly with bottom up.
  3. While holding coil assembly, depress spring lock to rotate hub in direction of arrow until it stops.
  4. The coil ribbon should be wound up snug against the center hub.
  5. Rotate coil hub in opposite direction approximately two and a half (2 ½) turns.
  6. Release spring lock between locking tabs.

  7. Object Number: 396373  Size: SH
  8. These instructions should follow the instructions on the notice (1) of the SIR coil assembly.