Turning the screw clockwise will increase the idle speed, while turning the screw counterclockwise will decrease the idle speed.
You will need to start the engine of your Grand Prix and allow it to warm up to its normal operating temperature before adjusting the idle.
Once the engine is warm, you can use a tachometer to measure the engine's idle speed.
The idle speed should be set to around 700 RPMs for a 1992 Grand Prix.
You may need to make several adjustments to the IAC valve in order to get the idle speed set correctly.
- If the idle is set too high, it can put strain on the engine and waste gas.
- If the idle is set too low, the engine may stall or run rough.
Once you have set the idle speed to the desired RPMs, you should turn off the engine and allow it to cool down before reinstalling the air cleaner.
