K 3500 Truck 4WD V8-5.7L VIN R (1998)
Throttle Body: Service and Repair
Throttle Body Assembly Removal and Replacement
SERVICE INFORMATION
The throttle body assembly repair procedures cover component replacement with the unit on the vehicle. However, the throttle body replacement
requires that the complete unit be removed from the engine. An 8 digit part identification number is stamped on the bottom of the throttle body
casting. Refer to this number if servicing, or part replacement is required.
While on-vehicle or off, clean the throttle bore and valve deposits using the carburetor cleaner and a parts cleaning brush. Follow the instructions
on container.
THREAD LOCKING COMPOUND
WARNING: In precoating screws, do not use a higher strength locking compound than recommended. Doing so could make removing the screw
extremely difficult or result in damaging the screw head.
The service repair kits are supplied with a small vial of thread-locking compound with directions for use. If the material is not available, use
Loctite 262 or the equivalent.
Do not use a cleaner that contains methyl ethyl ketone, an extremely strong solvent, and not necessary for this type of deposit.
The throttle body metal parts may be cleaned following the disassembly in a cold immersion-type cleaner such as GM X-55 or the equivalent.
WARNING: Do not immerse the Throttle Position (TP) sensor and Idle Air Control (IAC) valve in any type of cleaner because they are
electronic devices.
REMOVAL PROCEDURE
1. Disconnect the negative battery cable.
Air Inlet Duct Fastener
2. Remove the air inlet duct fastener and the duct.
Throttle Position Sensor Electrical Connector
3. Remove the IAC valve and the TP sensor electrical connectors.
4. Remove the throttle and cruise control cables.
