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Starting with the 1986 model year, the AMC straight-4 engines used a throttle body injection (TBI) or single-point, fuel injection system with a new fully computerized engine control. [3] In addition to cycling the fuel injector (pulse-width time, on–off), the engine control computer also determined the ignition timing, idle speed, exhaust ...
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.
The injector is located in the combustion chamber, inlet manifold or – less commonly – the throttle body. Fuel injectors which also control the metering are called injection valves, while injectors that perform all three functions are called unit injectors.
A bored-out (to 92 mm (3.62 in)) 4.5 L (273 cu in) 4.5 version was rated 155 hp (116 kW) and featured throttle body fuel injection. There were various versions of this engine built from its introduction in 1988 to the end of production in 1992 including a high-output LW2 version with multi-port fuel injection which produced 200 hp (149 kW) and ...
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).
Throttle Body Injection (TBI) was common to see as a cheap and simple way to swap to fuel injection in the 1980s from a carbureted engine design, and many early EFI cars used it until a newer engine could be designed for Multi Point Fuel Injection (MPFI).