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Throttle Body: Installation

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean gasket surface on intake manifold and throttle body. Install NEW throttle body flange gasket. Install throttle body assembly. Install throttle body-to-intake manifold studs and tighten to specification. See TORQUE SPECIFICATIONS .
  2. To complete installation, reverse removal procedure. To reset IAC valve pintle position, turn ignition on for 5 seconds. Turn ignition off for 10 seconds. Start engine and check for proper idle operation. Repeat procedure if proper idle operation is not obtained.


  1. Clean gasket surface on intake manifold and throttle body. Install NEW throttle body flange gasket. Install throttle body assembly. Install throttle body retaining nuts and tighten to specification. See TORQUE SPECIFICATIONS .
  2. To complete installation, reverse removal procedure. Fill and bleed cooling system. See COOLING SYSTEM BLEEDING  under COOLING SYSTEM. Check for coolant leaks.
  3. Connect a scan tool to Data Link Connector (DLC), under left side of instrument panel. Turn ignition on, with engine off. Using scan tool, ensure vehicle is not in a reduced engine power mode. Operate accelerator pedal while observing throttle angle on scan tool. Accelerator pedal should operate freely, without binding, between closed throttle and Wide Open Throttle (WOT).


  1. Clean gasket surface on intake manifold and throttle body. Install NEW throttle body flange gasket. Install throttle body assembly. Install throttle body retaining nuts and tighten to specification. See TORQUE SPECIFICATIONS .
  2. To complete installation, reverse removal procedure. Before starting vehicle, ensure throttle and cruise control linkage does not bind or hold throttle open. Fill and bleed cooling system. See COOLING SYSTEM BLEEDING  under COOLING SYSTEM. Check for coolant leaks.
  3. To reset IAC valve pintle position, turn ignition on for 5 seconds. Turn ignition off for 10 seconds. Start engine and check for proper idle operation. Repeat procedure if proper idle operation is not obtained.


  1. Clean gasket surface on intake manifold and throttle body. Install NEW throttle body flange gasket. Install throttle body assembly. Install throttle body retaining nuts and tighten to specification. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.
  2. Connect a scan tool to Data Link Connector (DLC), under left side of instrument panel. Turn ignition on, with engine off. Using scan tool, ensure vehicle is not in a reduced engine power mode. Operate accelerator pedal while observing throttle angle on scan tool. Accelerator pedal should operate freely, without binding, between closed throttle and Wide Open Throttle (WOT).
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