Cleaning Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 GMC Yukon XL, 2004 GMC Yukon, 2004 Chevrolet Tahoe, 2004 Chevrolet Suburban, and 2004 Chevrolet Avalanche. 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 (714) 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: View Of MAP Sensor

GM1277093

Courtesy of GENERAL MOTORS CORP.

Remove and discard the intake manifold-to-cylinder head gaskets (514).

Fig 2: View Of Intake Manifold-To-Cylinder Head Gasket

GM1277097

Courtesy of GENERAL MOTORS CORP.

Remove the fuel rail with injectors. Refer to Fuel Rail and Injectors Removal .

Fig 3: View Of Fuel Rail W/Injectors

GM1201536

Courtesy of GENERAL MOTORS CORP.

Remove the throttle body and gasket. Refer to Throttle Body Removal .

Fig 4: View Of Throttle Body & Nuts

GM825837

Courtesy of GENERAL MOTORS CORP.

Remove the evaporative emissions (EVAP) purge solenoid (708), bolt (710), and isolator (709).

Fig 5: View Of EVAP Purge Solenoid, Bolt & Isolator

GM1277094

Courtesy of GENERAL MOTORS CORP.

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.