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Throttle body fuel injection, or Throttle-Body Injection (called TBI by General Motors) or single-point injection was introduced in the mid-1980s as a transition technology toward individual port injection. The TBI system injects fuel at the throttle body (the same location where a carburetor introduced fuel). The induction mixture passes through the intake runners like a carburetor system, and is thus labelled a "wet manifold system". The justification for the TBI/CFI phase was low cost. Many of the carburetor's supporting components could be reused such as the air cleaner, intake manifold, and fuel line routing. This postponed the redesign and tooling costs of these components. Most of these components were later redesigned for the next phase of fuel injection's evolution, which is individual port injection, commonly known as MPFI or "multi-point fuel injection". TBI was used extensively on American-made passenger cars and light trucks in the 1980 to 1995 timeframe and some transition-engined european cars throughout the early and mid 1990s.

This was available on the Camaro in the L03 305ci V8, and was also used on the "Iron Duke" L4