Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Remove the intake manifold. Refer to INTAKE MANIFOLD REPLACEMENT .
Gently pry up the rubber covers.
Disconnect the knock sensor electrical connectors.

Fig 1: Disconnecting Knock Sensor Electrical Connectors
Courtesy of GENERAL MOTORS CORP.
Remove the knock sensors.

Fig 2: Removing Knock Sensors
Courtesy of GENERAL MOTORS CORP.
Remove the engine valley cover bolts.
Remove the engine valley cover and gasket.
Discard the old gasket.

Fig 3: Removing Engine Valley Cover, Bolts & Gasket
Courtesy of GENERAL MOTORS CORP.
Remove the knock sensor oil seals (1) from the cover (2).
If required, clean and inspect the engine valley cover. Refer to Engine Valley Cover Cleaning and Inspection .

Fig 4: Removing Knock Sensor Oil Seals From Cover
Courtesy of GENERAL MOTORS CORP.