Glossary “manifold vacuum” Definition:
The negative pressure in an engine’s intake manifold produce by the engine’s pumping action and measured in inches of mercury.

Glossary “manifold control valve” Definition:
Thermostatically controlled valve in the exhaust manifold for varying heat to the intake manifold with respect to the engine temperature.

Glossary “manifold gauge set” Definition:
1). A set of gauges used to service an A/C system. 2). A set of gauges used to measure vacuum or pressure in an engine’s intake or exhaust system.

Glossary “manifold heat control” Definition:
A flapper-type valve in the exhaust manifold that diverts heat to the intake manifold, to aid in engine warm-up.

Glossary “manifold pressure” Definition:
A positive pressure in the intake manifold measured in pounds per square inch or bars.

Glossary “manifold skin temperature sensor” Definition:
Located on the outside surface of the intake manifold, its signal data is send to the compuvalve for A/F density calculations on bi-fuel vehicles.

Glossary “manifold absolute pressure sensor” Definition:
Variable resistor used as a sensor to signal an engine control computer, signals relative to the vacuum conditions in the intake manifold.

Glossary “manifold air temperature” Definition:
The temperature of the intake stream in the intake manifold, as increased by a heat riser or an Early Fuel-Evaporation system, and/or converted to an engine-control computer input by a sensor.

Glossary “manifold charge temperature” Definition:
See air charge temperature.

Glossary “manifold absolute pressure (MAP)” Definition:
The pressure in an intake manifold relative to atmospheric pressure.