Throttle Body Buyer's Guide

The Throttle Body is a device located in the engine compartment, between the intake manifold and air intake pipe. It is similar to the carburetor but does not regulate fuel flow. The throttle body monitors the amount of air that can flow into an engine's combustion chamber. The most important and largest part inside the throttle body is its throttle plate. This plate has a butterfly valve, which rotates on the throttle shaft. When the throttle plate is rotated by the shaft the air flows in and out of the engine.
The throttle body is responsible controlling the amount of air that flows into an engine. A valve is mounted inside the opening of the throttle body that opens and closes depending on input from the driver applied through the gas pedal. As the gas pedal is pushed down, the valve opens, allowing air to enter the engine. As the gas pedal is released, the valve closes, reducing the amount of air entering the engine.

Typically located between the air filter and the intake manifold, the throttle body contains the delicate throttle system which controls a key component of spark ignition: air flow. Part of the atomization process, airflow helps regulate the air-fuel mixture ratio required to ignite an engine.
The primary regulator for throttle pressure comes in the form of the throttle body temperature sensor, which measures the temperature of the air-fuel mixture entering the fuel injection system of your car. This necessary regulation helps spark ignitions generate the most fuel efficiency.
Largely controlled by the butterfly valve known as the throttle plate, airflow is regulated by the driver via pressing on the acceleration pedal inside the vehicle. This reacts to a sensor on the throttle bottle which tells it to allow more air into the combustion chamber, increasing REM and power output. This makes the car, in turn, go faster.

Remember these three simple rules when shopping for a new performance throttle body:
• Confirm that the throttle body you want is emissions-legal in your province or state.
• Bigger is not necessarily better when choosing a throttle body. If you're vehicle is close to stock, you'll be best off with an only slightly bigger size.
• Think about the future mods you're planning to make. If you're planning major performance upgrades, invest in a bigger throttle body from the get-to. This will ensure you have the air flow you'll need down the road.

In today's modern fuel injected cars, the throttle body is a critical piece of the air intake system that controls the amount of air flowing into the engine. The amount of air allowed in is a function of how far the driver presses the accelerator pedal to the floor. As you press down on the pedal, a sensor called a throttle position sensor receives a signal relative to where your foot is, ranging from all the way up (zero acceleration), to all the way down (full acceleration). This sensor relays this information to the car's main computer giving it constant updates as to the position of the throttle. The position of the pedal along this range is how the computer knows what to tell the fuel injection system in terms of how much more or less fuel to inject into the system.
When this process is regulated properly, a perfect balance of air and fuel is introduced to your car's engine, allowing it to run smoothly and perform at an optimum level. There are a number of reasons that a throttle body may fail to work properly.

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The throttle body is the part of the engine that mixes air with the fuel to allow combustion to take place. There are a number of symptoms that are often due to a failure in this part, including repeated stalling for no reason, problems with responsiveness of the acceleration pedal and stumbling or hesitation whilst accelerating.
Before completely replacing the throttle body it is always advisable to check that this part is clean and free from dirt. If you find that you are still having repeated acceleration issues with your car following the cleaning process, then throttle replacement is the next step. Due to the complex connections on the throttle body together with the procedure necessary to ensure that this part is safely in place, we would only recommend taking on this job if you have a good mechanical knowledge.