Throttle Body Replacement

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Learn about Throttle Body Replacement from Wrench

Mobile Throttle Body Replacement at Home or Office

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.

What is Throttle Body Replacement?

The throttle body controls airflow into the engine in a fuel injection system. It is mounted between the air cleaner and the intake manifold, and contains a butterfly valve, or plate, that operates according to accelerator pedal position. When pressure is applied to the pedal, the valve opens allowing more air into the engine. At the same time various sensors signal the Powertrain Control Module (PCM) to correspondingly increase injector pulse width to boost fuel flow.

How is Throttle Body Replacement Done?

  1. Refer to the service manual for identification and location of the throttle body.
  2. Remove the air intake duct from the throttle body once it is located.
  3. Check the throttle body as well as the assembly and ports. If there is wearing in the assembly it may also require replacement.
  4. Pull out the cables from the throttle body.
  5. Remove the hoses such as air or vacuum hoses from the throttle body.
  6. Disconnect the throttle position sensor.
  7. Remove the screws that are holding the throttle body in the assembly.
  8. Remove the throttle body carefully after disconnecting everything.
  9. Properly clean the assembly and port to remove any carbon build up.
  10. Compare the old throttle body with the new one.
  11. Install the throttle body in the port.
  12. Fasten the bolts and screws to hold it in place.
  13. Connect all the things that you previously removed.
  14. After connecting everything start your engine and test for the new throttle body.


Many modern throttle bodies have spring loaded sensors and plastic gears that are not intended to be manipulated directly during any diagnostics or inspections. These components are controlled electronically or generate signals. It is best to let a mechanic use approved tests to diagnose the problem.

Symptoms That Indicate You Need A Throttle Body Replacement

  • Vacuum leak
  • Poor or high idle

Throttle bodies are generally reliable components, but on high mileage vehicles the shaft can wear, and dirt and deposit buildup can cause rough idle and stalling. Throttle bodies can often be cleaned with specialized cleaner, but some manufacturers do not recommend cleaning and replacement may be the only option. Whatever your throttle body needs, Wrench's mobile mechanics have the parts for the repair. Get in touch with us today!