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Broken springs or diaphragms would cause it either to be repaired or replaced. Some were repairable (early units) as later models would need entire replacement. As the throttle blades are open the manifold or engine vacuum drops as ported vacuum (above throttle blades) increases.
A blowoff valve is designed to release pressure in the intake system when the throttle is closed. A "recirculating" type blowoff valve releases the pressurised air back into the non-pressurized section of the intake (i.e. upstream of the turbocharger), while an "atmospheric venting" type blowoff valve dumps the air directly into the atmosphere.
In fuel injected engines, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver accelerator pedal input in the main. The throttle body is usually located between the air filter box and the intake manifold, and it is usually attached to, or near, the mass airflow sensor.
Throttle body with integrated motor actuator. Electronic throttle control (ETC) is an automobile technology that uses electronics to replace the traditional mechanical linkages between the driver's input such as a foot pedal to the vehicle's throttle mechanism which regulates speed or acceleration.
Adjusting the throttle generally adjusts spring tension on the governor, which in turn allows the engine to run faster or slower, as desired. While the redline cannot be seen on most small engines, due to their lack of a tachometer, the risk of excessive engine speed is not generally a concern.
Single-point injection (also called 'throttle-body injection') [20] uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold. As in a carburetted induction system, the fuel is mixed with the air before entering the intake manifold. [ 18 ]
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