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How is the idle adjusted on a Chevy 5.7 liter fuel injected engine?

To adjust the idle on a Chevy 5.7-liter fuel-injected engine:

1. Start the engine and let it warm up to operating temperature.

2. Connect a tachometer to the engine.

3. Locate the idle air control (IAC) valve.

* Usually mounted on the throttle body

4. Turn the IAC valve screw clockwise or counterclockwise to adjust the idle speed.

Adjust until the engine reaches the desired idle speed, typically around 600-700 RPM (refer to your specific repair manual)

5. Once the idle speed is set, tighten the IAC valve screw to prevent it from moving.

6. Test the idle speed by turning the engine on and off a few times. The idle speed should remain constant.

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