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Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere.. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intervening carburetor or throttle body leading to the intake manifold.
A typical ETC system consists of three major components: (i) an accelerator pedal module (ideally with two or more independent sensors), (ii) a throttle valve that can be opened and closed by an electric motor (sometimes referred to as an electric or electronic throttle body (ETB)), and (iii) a powertrain or engine control module (PCM or ECM). [4]
An engine operating at wide open throttle (WOT) on top of a very high mountain has a manifold pressure of about 50 kPa (essentially equal to the barometer at that high altitude). Condition 2: The same engine at sea level will achieve that same 50 kPa (7.25 psi, 14.7 inHG) of manifold pressure at less than (before reaching) WOT due to the higher ...
The intake manifold vacuum, with wide open throttle, is lower in these conditions, which causes the PCV valve to open and the crankcase gases flow to the intake system. [13] The greater flow rate of intake air during these conditions means that a greater quantity of blow-by gases can be added to the intake system without compromising the ...
A throttle position sensor (TPS) is a sensor used to monitor the throttle body valve position for the ECU of an engine. The sensor is usually located on the butterfly spindle/shaft, so that it can directly monitor the position of the throttle. More advanced forms of the sensor are also used.
In 1986, throttle-body injection replaced the carburetor on the 2.5 L I4 engines. A Renault 2.1 L (128 cu in) Turbo-Diesel I4 diesel was also offered. Starting with the 1987 models, a new 4.0 L (244 cu in) I6 engine, derived from the older 258 cu in (4.23 L) I6 with a new head design and an electronic fuel injection system, replaced the ...
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Bosch hot-film air mass meter, cast alloy Siemens-VDO throttle body with electronically controlled 'drive by wire' throttle butterfly valve, cast aluminium alloy intake manifold; Garrett variable turbine geometry (not all models) turbocharger incorporated in exhaust manifold, 2.3 bar (33.4 psi) absolute boost; side-mounted intercooler (SMIC)
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