Pulse Air Injection: Description

The Pulse Air Injection Reaction (Pair) system is used on General Motors models with 4.1L 6-cylinder engines. It is a non-pump type air injection system which uses engine exhaust pulses to draw fresh air into the exhaust system. This helps to oxidize HC and CO emissions. System consists of a grouping of check valves in 2 plenum chambers (located on valve covers) and related tubing.