I believe it's through the muffler
Follow the intake air plenum from the air filter. It connects to the carburetor. The carburetor is mounted on the intake manifold.
A carburetor mixes air and fuel in appropriate proportions. Air and Liquid fuel are the inputs to the carburetor at different points of the carburetor. Due to suction created by the working engine , atmosperic Air is accelerated through the venturi in the carburetor. Accelerating Air sucks Fuel into the venturi at its center from a level regulated liquid fuel pot in the carburetor,due to the venturi action. (Bernoulli's Principle) During the process of sucking the fuel is atomised /becomes a mist , as it enters the venturi. The atomised fuel then evaporates and mixes with the air uniformly. This uniform gaseous mixture of fuel and air is the out put of the carburetor. This gaseous mixture then enters into engine cylinders for combustion.
A carburetor mixes air and fuel in appropriate proportions. Air and Liquid fuel are the inputs to the carburetor at different points of the carburetor. Due to suction created by the working engine , atmosperic Air is accelerated through the venturi in the carburetor. Accelerating Air sucks Fuel into the venturi at its center from a level regulated liquid fuel pot in the carburetor,due to the venturi action. (Bernoulli's Principle) During the process of sucking the fuel is atomised /becomes a mist , as it enters the venturi. The atomised fuel then evaporates and mixes with the air uniformly. This uniform gaseous mixture of fuel and air is the out put of the carburetor. This gaseous mixture then enters into engine cylinders for combustion.
In most cases, you can locate the carburetor screws in the front of the carburetor. Sometimes you have to remove the air gilter to get to to the carburetor.
The flow of air in the carburetor venturi is restricted.
A carburetor is found in an internal combustion engine. The purpose of the carburetor is to blend fuel and air.
Running too rich, timing off. Search your engine and "backfire"
Installing a free-flowing air filter on top of each stack or over the carburetor air horn eliminates these conditions.
carburetion
outlet
The throttle position sensor on a 1997 Chevy Venture is located next to the air intake hose on the Electronic Fuel Injector (carburetor). Follow the air intake hose from the air filter to the EFI (carburetor) and it will be on the right hand side where the air intake hose connects to the carburetor.
The methods to control the fuel and air mixture in a carburetor include needle valves to control fuel flow, and the butterfly or ventura to control air flow.