Throttle Body (TB)
WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
The throttle body (TB) controls airflow to the engine through a single butterfly-type valve.
- The throttle position is controlled by a conventional cable through throttle linkage.
- The body is a single-piece die casting made of aluminum and has a single bore with an air bypass channel around the throttle plate.
- This bypass channel provides engine idle control as regulated by an idle air control (IAC) valve assembly.
- The valve assembly is an electromechanical device controlled by the PCM which incorporates a linear actuator which positions a variable area metering valve.
- A sealant is applied to the throttle plate and bore area to reduce closed plate-to-bore airflow. The sealant should not be removed or cleaned.
Other features of the TB include:
- factory-set throttle plate position at idle. DO NOT adjust or tamper with the throttle return control screw.
- a preset stop to locate the wide-open throttle position (WOT).
- a TB-mounted throttle position (TP) sensor.