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.

2008 Chevrolet Optra LS, AutomaticFACTORY OEM SERVICE PROCEDURE

Installation Procedure

Fig 1: View Of Throttle Body Cable And Coolant Hoses

Courtesy of GENERAL MOTORS CORP.

Install the throttle body assembly to the intake manifold.

NOTE: Refer to Fastener Notice .

Install the throttle body retaining nuts and the bolt.
Tighten: Tighten the throttle body retaining nuts and the bolt to 15 N.m (11 lb ft) .
Connect the throttle cable.
Connect the coolant hoses.

Fig 2: Identifying Breather Hose

Courtesy of GENERAL MOTORS CORP.

Connect the breather hose.
Install the intake air tube.
Connect the negative battery cable.

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.