Without Service Spring Lock

Hold SIR coil assembly with face up (centering window facing toward you). See Fig 2. Rotate coil hub clockwise until it stops. Rotate coil hub counterclockwise until centering window appears Yellow and line-up marks are aligned.

Fig 1: Identifying SIR Coil Assembly (With Service Spring Lock)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying SIR Coil Assembly (Without Service Spring Lock)

Courtesy of GENERAL MOTORS CORP.