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In the US, this kind of single-point injection was marketed as 'throttle body injection' (TBI, by GM), or 'central fuel injection' (CFI, by Ford). Mono-Jetronic is different from all other known single-point systems, in that it only relies on a throttle position sensor for judging the engine load.
Single-point injection (also called 'throttle-body injection') [20] 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. [18]
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.
Holley Performance Products is an automotive performance company based in Bowling Green, Kentucky. It was founded in 1896 in Bradford, Pennsylvania , by George Holley and Earl Holley. When the company was based in Michigan it was a major producer of carburetors for many Detroit-built automobiles.
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.
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).