Cleaning Procedure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Do not reuse the intake manifold-to-cylinder head sealing gaskets.

Remove the Manifold Absolute Pressure (MAP) sensor (1) from the rear of the intake. The MAP sensor is to be reinstalled upon completion of the cleaning and inspection procedures.
Inspect the sealing grommet on the MAP sensor. The grommet should not be torn or damaged.

Fig 1: MAP Sensor
Courtesy of GENERAL MOTORS CORP.
Remove and discard the intake manifold-to-cylinder head gaskets (1).

Fig 2: Intake Manifold-To-Cylinder Head Gasket
Courtesy of GENERAL MOTORS CORP.
Remove the fuel rail with injectors. Refer to Fuel Rail and Injectors Removal .

Fig 3: Fuel Rail With Injects
Courtesy of GENERAL MOTORS CORP.
Remove the throttle body and gasket. Refer to Throttle Body Removal .

Fig 4: Throttle Body & Nut
Courtesy of GENERAL MOTORS CORP.
Remove the Evaporative Emissions (EVAP) purge solenoid (3), bolt (2), and isolator (1).
Clean the intake manifold in solvent.
- Clean the intake manifold gasket surfaces.
- Clean the intake manifold internal passages.
CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
Dry the intake manifold with compressed air.

Fig 5: EVAP Purge Solenoid, Bolt & Isolator
Courtesy of GENERAL MOTORS CORP.