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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]
For 1991, the 700R4 was renamed to the 4L60. The TBI (throttle body injection) system used on the Blazer's standard 5.7 liter V8 had longer throttle shaft bearings, new throttle return springs, and improved fuel mixture distribution. The 5.7 liter V8 also had new heavy-duty intake valves and powdered metal camshaft sprockets.
In 1987, the Chevrolet full-size pickups and vans were upgraded to use the LB4 throttle-body injection version of the 4.3 L (262 cu in). The mechanical fuel pump boss was retained but the hole was undrilled (marine applications had the fuel pump boss drilled and tapped).
This engine was similar to the LQ5, except that it used a two-barrel carburetor instead of a throttle-body fuel injection system. This engine was used in the Chevrolet S-10 and GMC S-15 compact pickup trucks and their Blazer and Jimmy counterparts until 1985, when it was replaced by the 2.5-liter Tech IV engine. This engine produced 83 hp (62 ...
The Cavalier began development in the late 1970s, as Chevrolet sought to replace the compact Monza with a front-wheel drive model line sized between the Chevrolet Chevette subcompact and the front-wheel drive Nova replacement (which was renamed the Chevrolet Citation for production). Serving as a replacement for the Vega, the Monza was offered ...
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.
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