Removal & Disassembly
- Drain cooling system. Relieve fuel pump pressure, see FUEL SYSTEM PRESSURE RELEASE. Disconnect negative battery cable. Remove air cleaner assembly and fuel lines. Disconnect and label all vacuum and coolant hoses, wire connectors and cable linkages from throttle body.
- Remove 4 bolts retaining throttle body to intake manifold. Remove throttle body and discard gasket. Clean gasket mating surfaces. Remove fuel injector. See INJECTOR (TBI).
- Remove Throttle Position Sensor (TPS), fuel pressure regulator and Idle Speed Control (ISC) solenoid valve from throttle body. See Fig 1
. Remove attaching screws and separate upper and lower throttle bodies.
- DO NOT soak any electrical device or air valve in solvent or other cleaner. DO NOT use drills or wires to clean passage ways. Clean upper and lower passages with compressed air only.
Courtesy of GENERAL MOTORS CORP.