You know how when you press on the gas pedal the car goes faster? The throttle is the part of the engine assembly that opens to let more air into the engine and simultaneously sends in more fuel, thereby making the engine put out more power, making the wheels go faster. On injected vehicles an air valve assembly is connected to the throttle mechanism to allow more air when the gas pedal is pushed. At the same, a throttle position sensor determines how much you have pressed the pedal and the computer, sensing the positon change, causes the injectors to deliver the appropriate amount of fuel into the throttle-body or manifold (depending on the type of injection system).
TPS (throttle position Sensor) is a variable potentiometer! Is is connected to the throttle shaft on the throttle body. The ECM/PCM (computer) uses the voltage from the TPS to determine fuel delivery based on the angle of the throttle shaft or valve (driver demand) A loose or broken TPS can cause an unstable idle or intermittent bursts of fuel from the fuel injectors, because the ECM/PCM is fooled into thinking the throttle is moving.
Throttle body injection has one injector located in the throttle body that supplies fuel to the intake manifold. This fuel flows to all cylinders just like it does on a vehicle with a carburetor. Port injection uses tubes with poppet valves from a central injector to spray fuel at each intake port rather than the central throttle body.
No, it has a throttle body. The throttle unit resembles a carburetor except that there is no fuel bowl, float or metering jets. The fuel is sprayed directly into the throttle bore by an injector. It's actually fuel injection, except the fuel is injected in the module beneath the air cleaner as opposed to each individual cylinder.
You may have a throttle position sensor going out or possibly the fuel pump. Get some throttle body cleaner and clean the throttle body inside to make sure the throttle blade inside the body is not hanging up and then get a fuel pressure gauge and connect it to the fuel raila nd see what kind of pressure you get when you rev the engine..and see if there is a drop when you open the throttle.
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