Air Gulp System: Description

The air gulp system is designed to prevent backfiring in the exhaust system during sudden deceleration. During deceleration, the air/fuel mixture becomes overly rich. This causes uncontrolled combustion in the exhaust system (engine backfiring). To prevent this, the air gulp system supplies fresh air to the engine during deceleration. This leans out the air/fuel mixture and allows normal combustion to occur, eliminating the backfiring.

The system consists of a gulp valve which supplies fresh air to the intake manifold. The valve is controlled by a vacuum signal taken from a tap on the intake manifold. The vacuum signal is controlled by an electro-valve. The electro-valve is energized during engine starting by the starting circuit and during cold engine operation by a thermo switch.