Removal Procedure

Remove the lower left intake manifold. Refer to Intake Manifold Spacer Replacement andIntake Manifold Replacement - Lower Left in Engine Mechanical - 3.5L (L66).

Fig 1: View Of Left Intake Manifold & Gasket
Courtesy of GENERAL MOTORS CORP.
Disconnect the wiring harness connector from the knock sensor (KS).
Remove the KS from the engine block.