How to Adjust the Cold Idle in a Honda Civic

Written by aram khayatpour
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How to Adjust the Cold Idle in a Honda Civic
A car engine needs some adjusting in order to run properly over an extended period of time. (engine image by goce risteski from

Sometimes the internal combustion engine in a Honda Civic can begin to function improperly. This will cause the car to sputter at idle, resulting in a rough ride or, in some cases, frequent stalling. In order to alleviate this, you have the option of adjusting the cold idle, smoothing out the engine and improving ride quality. Changing the idle speed can be done by manipulating the amount of air and fuel that enters the combustion chamber by adjusting a small screw.

Skill level:
Moderately Easy

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Things you need

  • Philips-head screwdriver

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  1. 1

    Open the bonnet. Use the bonnet support rod to keep the bonnet securely open.

  2. 2

    Locate the idle adjustment screw. It will be underneath the air box located in the centre of the engine. You do not need to remove the air box as the screw is accessible from the side.

  3. 3

    Turn the screw using a Phillips-head screwdriver. Turning it clockwise will raise the idle speed, turning it counterclockwise will lower it.

  4. 4

    Start the car and check to see if the Civic is idling where you want it to. If not, turn off the car and repeat the process.

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