Throttle Body

This procedure covers removal and replacement of the throttle body on a 2014-2018 Chevrolet Silverado 1500 with the 5.3L V8 EcoTec3 L83 engine.

Warnings

Tools required

Parts

• Throttle body gasket × 1 — GM 12669325 or equivalent
• Throttle body assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely for at least 30 minutes
3. Disconnect negative battery cable and wait 2 minutes for system capacitors to discharge
4. Remove engine cover by pulling upward on cover tabs

Procedure

1. 1

   Remove air intake tube
   Loosen the clamp at the throttle body inlet using a flathead screwdriver or socket. Loosen the clamp at the air filter box end. Disconnect the Mass Air Flow (MAF) sensor electrical connector by pressing the release tab. Remove the air intake tube by pulling it away from the throttle body.
   Torque spec

   Air Intake Hose Clamps3 Nm (2 lb-ft)
2. 2

   Disconnect throttle body electrical connector
   Locate the throttle body electrical connector on the driver's side of the throttle body. Press down on the release tab while pulling the connector away from the throttle body. Move the harness aside to provide clearance for removal.
3. 3

   Remove throttle body mounting bolts
   Locate the four throttle body mounting bolts securing the throttle body to the intake manifold. Remove all four bolts using the appropriate socket, working in a criss-cross pattern to prevent binding. Keep bolts organized for reinstallation.
4. 4

   Remove throttle body assembly
   Carefully pull the throttle body straight away from the intake manifold. The throttle body may stick slightly due to the gasket seal. Gently wiggle if necessary but avoid prying against the sealing surfaces. Once removed, immediately cover the intake manifold opening with a clean rag to prevent debris from entering.
   ⚠Do not allow dirt or debris to enter the intake manifold opening as this can cause severe engine damage
5. 5

   Remove and inspect old gasket
   Remove the old throttle body gasket from the intake manifold surface. Inspect both the throttle body and intake manifold mating surfaces for damage, warping, or deep scratches. Use a clean rag to wipe both surfaces completely clean. Do not use abrasive materials that could scratch the aluminum surfaces.
6. 6

   Inspect throttle body bore
   If reusing the throttle body, inspect the throttle plate and bore for carbon buildup. Clean if necessary using throttle body cleaner and a soft cloth. Do not force the throttle plate open during cleaning. Allow cleaner to evaporate completely before reinstallation.
   ℹ️Never spray throttle body cleaner directly into the intake manifold opening
7. 7

   Install new gasket
   Position the new throttle body gasket onto the intake manifold. Ensure the gasket is properly aligned with all four bolt holes and sits flat against the manifold surface. The gasket should fit snugly without forcing.
8. 8

   Install throttle body
   Remove the rag from the intake manifold opening. Carefully position the throttle body onto the intake manifold, aligning it with the gasket and ensuring all four bolt holes line up. Press the throttle body gently into place.
9. 9

   Install and torque mounting bolts
   Thread all four throttle body mounting bolts by hand to prevent cross-threading. Once all bolts are hand-tight, torque them in a criss-cross pattern to the specified torque value. First pass at 5 Nm, then final torque to specification.
   Torque spec

   Throttle Body Bolts10 Nm (7 lb-ft)
10. 10

    Reconnect electrical connector
    Reconnect the throttle body electrical connector by aligning the connector and pressing firmly until you hear and feel a positive click. Gently tug on the connector to verify it is fully seated and locked.
11. 11

    Reinstall air intake tube
    Position the air intake tube onto the throttle body inlet and the air filter box outlet. Reconnect the MAF sensor electrical connector. Tighten both hose clamps to the specified torque, ensuring the clamps are positioned properly over the beaded sections of the connections.
    Torque spec

    Air Intake Hose Clamps3 Nm (2 lb-ft)
12. 12

    Reinstall engine cover and battery
    Reinstall the engine cover by aligning the mounting tabs and pressing down until fully seated. Reconnect the negative battery cable and tighten securely.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify all hose clamps are tight and positioned correctly
3. Double-check that no tools or rags were left in the engine bay

Verification

• Turn ignition to ON position without starting engine and verify no warning lights remain illuminated after bulb check
• Start the engine and allow it to idle. The idle may be rough initially as the ECM relearns throttle position
• Check for vacuum leaks around the throttle body gasket by listening for hissing sounds
• Rev the engine gently to 2000 RPM and verify smooth throttle response with no hesitation
• Take vehicle for a test drive and verify normal acceleration and idle quality. The throttle relearn process may take 10-15 minutes of driving
• After test drive, re-check all connections and verify no leaks are present

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