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How to Adjust Engine Idle Speed?

2 Answers

DiJoel

07/24/25 3:58am

Engine idle speed adjustment method is as follows: 1. After the throttle grip is completely relaxed, leave a certain amount of free play. Install the air filter, ensure the performance of other components is intact, start the engine, and let it warm up. First, open the choke. 2. Begin the adjustment by first screwing the air adjustment screw all the way in, then turning it out one full turn. Next, adjust the throttle screw to ensure the engine can run at a certain speed even when the throttle grip is completely relaxed. 3. Try lowering the idle speed first to reduce the engine speed as much as possible. 4. Then try increasing the idle speed by adjusting the air adjustment screw again to make the engine speed as high as possible. 5. Repeat the steps continuously, and after several adjustments, you will find a satisfactory idle speed.

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MackenzieAnn

08/10/25 11:30pm

Last time I helped adjust the idle speed on my old 2005 Jetta, it wasn't as mysterious as it seemed. First, warm up the engine until the coolant reaches normal operating temperature, and have a partner sit in the driver's seat to monitor the tachometer. Open the hood and locate the small silver screw near the throttle body, then use a Phillips screwdriver to turn it slowly—clockwise to decrease RPM and counterclockwise to increase it. Pause after every quarter turn, waiting for the RPM to stabilize before continuing. Aim for around 750 RPM; too low and the engine will shake when the AC is on, too high and it'll waste fuel. Before adjusting, check for vacuum leaks—once I spent hours adjusting only to find a cracked hose. This method only works for older cable-operated throttle bodies; newer cars mostly rely on the ECU to self-adjust.

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