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Throttle Body

Auto Systems and Repair

The throttle body is a housing containing a valve(s) that regulates the airflow entering the intake manifold on its way to the combustion chamber. The valve(s) opens and closes based on driver input via the gas pedal.

Symptoms of Wear or Failure

  • Stalling problems
  • Engine may run roughly
  • Illumination of the Check Engine Light
  • Gas pedal hard to push as a result of a worn throttle shaft

Related Repair Advice

  • Residue build up on the throttle bore can result in lower than normal engine idle and engine stalling, especially after battery replacement
  • Newer vehicles are using an electronically-controlled throttle body in place of the older cable-operated system
  • When replacing an electronic throttle body, the related connectors and wiring should be thoroughly inspected

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