Cleaning Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

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

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

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

Fig 4: Removing Throttle Body & Gasket
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 .
Dry the intake manifold with compressed air.

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