2005 Chevrolet ClassicFACTORY OEM SERVICE PROCEDURE

Installation Procedure

  1. Lubricate the IAC valve seal with clean engine oil.
  2. Install the IAC valve into the throttle body.
  3. IMPORTANT: Install a new screw when replacing the IAC valve.
  4. Install the IAC valve screw.

    Tighten:Β  Tighten the IAC valve screw to 3 N.m (27 lb in).

  5. Fig 1: View Of Idle Air Control (IAC) Valve & Throttle Position (TP) Sensor
    GM783168Courtesy of GENERAL MOTORS CORP.
  6. Connect the IAC valve harness connector (1).
  7. Install the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator ReplacementΒ .
  8. Reset the IAC valve pintle using the following procedure:
    1. Turn ON the ignition, with the engine OFF.
    2. Turn OFF the ignition for 10 seconds.
    3. Start the engine and check for proper idle operation.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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