Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2003 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

Section 259 (Intake Air Control System): Replacement: 3MZ-FE

WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

REMOVE INTAKE AIR CONTROL VALVE ASSY NO. 2
1. Remove the 3 bolts and nut.
2. Rotate the lever to the closed position as shown in Fig 1 and pull out the IAC valve.
  
  Fig 1: Rotating Lever To Closed Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the gasket from the intake air surge tank.
INSTALL INTAKE AIR CONTROL VALVE ASSY NO. 2
1. Install a new gasket to the intake air surge tank.
2. Install the IAC valve with the 3 bolts and nut.
  Torque: 10 N.m (102 kgf.cm, 7 ft.lbf)

Factory Service Tools

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When to See a Mechanic

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

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