How to Adjust a Carburetor in a Corolla

Written by matt mckinney
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How to Adjust a Carburetor in a Corolla
Over time, carburettors collect dirt and debris, which must be removed for the car to continue functioning. (Jupiterimages/Comstock/Getty Images)

The carburettor mixes air and gasoline vapour before combustion, thereby ensuring your engine is able to function. Over time, though, dirt and debris can build up, and if your carburettor isn't properly maintained with regular maintenance and necessary tune-ups, your engine performance is going to suffer. Toyota Corollas are known for their performance and dependability, however, part of that dependability depends on the driver taking care of the vehicle.

Skill level:

Things you need

  • Screwdriver

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  1. 1

    Lift the bonnet of your Corolla and find the air filter and associated air cartridge. Remove both from the vehicle.

  2. 2

    Locate the idle mixture screw and rotate it clockwise until the registering needle hits the seat of the carburettor. Rotate the screw counterclockwise one and a half times. Rotate it counterclockwise until the screw reaches the seat of the emulsion tube if your carburettor has a main jet adjustment attached to it.

  3. 3

    Return the air filter and cartridge securely to their original places, but leave the hood up. Enter the driver's seat and restart your vehicle.

  4. 4

    Run the Corolla engine at half-throttle for several minutes to make sure it properly warms up. Exit the vehicle and turn the idle mixture screw clockwise one half rotation. Turn it back to its original position after the engine has slowed down.

    Adjusting the Choke Linkage on Your Corolla Carburetor

  1. 1

    Take out the air filter and cartridge from the engine. Locate the choke lever and switch the setting to "Fast." Loosen the mounting brackets, so the cable casings can move without restraint and tweak them until the engine's choke is shut.

  2. 2

    Screw the cable mounting back into place. Check the movement of the control lever until the choke linkage has been adjusted to the appropriate level as directed by your vehicle's user manual.

  3. 3

    Close the bonnet and restart the vehicle's engine. Take your Corolla for a test run to ensure that it's functioning properly.

Tips and warnings

  • Contact a certified auto mechanic to see if your Corolla's carburettor can be serviced without removing it from the engine. Depending on the year of your Corolla, products are available to clean the carburettor less invasively.
  • Severe carburettor contamination can make your engine completely fail.

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