Throttle body

Learn more about Throttle Body

What is it ?
In a traditional spark ignition gasoline engine, the throttle body is the part of the air intake system that controls the amount of air that flows into an engine's combustion chamber. It consists of a bored housing that contains a throttle plate that rotates on a shaft. When the accelerator is pushed down, the throttle plate opens and allows air into the engine.
Location in engine
It connected at one end to your air-cleaner assembly and on the other to the in-take housing as shown in the pic below.
What common symptoms indicate you may need to replace the Throttle Body?
A dirty throttle body may affect engine performance, so it's important to have it serviced. If you don't, you may experience one or more of these symptoms :
- Check Engine light is on.
- Warning message on dashboard for "Reduced Power."
- Poor car performance.
- Lack of power.
- Vehicle does not idle properly or engine does not run smoothly.
- Poor shifting of transmission.

Before changing your throttle body


A decarbonization lets to maintain your throttle body

Preventive engine cleaning enables you to restore engine parts rather than replacing them, thereby saving vehicle owners on costly parts, such as a new throttle bodies (250€ - 450€), catalytic converter (600€ - 2.000€), DPF (600€ - 2.000€) or EGR valve (370€ - 500€).

These problems result mainly from poor combustion, which stifles the engine.

So before replacing your engine parts, try Carbon Cleaning. A dirty engine as the result of carbon deposits is the new threat to vehicle performance.

Make your online diagnosis
How can you test your throttle body ?

1. Turn on the car, and let it warm up. Drive it around a bit so the engine is warm. Stop the car, and let it idle. Allow the car idle to level out to its lowest state.
2. Listen to the car operate to determine whether the engine is struggling to maintain a constant idle (rpm will fluctuate in idle). Try to trigger the "Check Engine" light warning by getting the engine to die out when it should continue to idle. Lower the idle if necessary by manually adjusting the throttle cable if your car has one. Resist the urge to press on the gas when it begins to buck and fail. Turn off the car when the "Check Engine" light comes on if it happens before the car dies.
3. Reach underneath the steering wheel, and open up the OBD connection panel. Plug in your OBD-II scanner to the connection. Put your car keys back in the car ignition, and turn it to the "On" position. Allow the scanner to read the car computer and confirm whether the problem lies with the throttle body sensor. Turn the car off again, and interpret the codes sent to the scanner.
4. Use the data from the scanner confirming the problem lies in the throttle assembly, and take the car to a mechanic.
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