[header] How to adjust a carburetor [title] Locate the air filter and remove it. [step] On most cars, you'll need to remove the air filter to expose to carburetor and adjust it. Open the hood and make sure the engine is off before locating the air filter and removing the assembly. 
Unscrew the wing-nut and any other connectors, and then remove the air filter entirely. [substeps] Depending on your make and model, and the kind of engine in the vehicle, the air filter could be in any number of different places on the engine.