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The 1980s also saw Holley's entrance into the fuel injection market where OEM EFI components and analog Pro-Jection retrofit fuel-injection systems for carbureted cars were introduced. In the early 1990s Holley continued new product introductions with the HP Pro Series race-ready carburetors.
This version of the 4.3 L (262 cu in) was equipped with CPI (Central Port Fuel Injection). This system had one centrally-located fuel injector to distribute fuel to six hoses each with a poppet valve to each of the intake ports. This system allowed for a multi-point fuel injection, using one injector. The fuel injection was a batch fire system ...
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.
Single-point injection (also called 'throttle-body injection') [17] 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. [ 15 ]
Several significant changes were made in 1987, which included: an improved cylinder head, intake manifold, and throttle-body fuel injection module; a more-modern serpentine belt with an automatic spring-loaded tensioner for the accessories; and a Distributorless Ignition System (DIS). This revision to the engine increased power to 98 hp (73 kW).
Starting in 1986, a throttle-body fuel injection system took advantage of the engine's breathing capacity. [4] The redesign included a revised computerized spark curve and 10% higher cranking speeds due to a new lighter weight - going from 17 to 8 lb (8 to 4 kg)), low-current draw permanent-magnet starters with compact planetary reduction gears ...
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.
The 318 two-barrel ELD received roller lifters and a fast-burn chambered cylinder head in 1985 (the four-barrel police ELE 318 continued to use modified J heads and hydraulic flat valve lifters through 1989). Throttle-body electronic fuel injection was factory equipment on the 1981–1983 Imperial. From 1988 to 1991, another throttle-body fuel ...
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