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Where can you find definitive answers about vehichle intake manifold vacuum?
Wiki User
∙ 14y ago
Engine manifold vacuum should be between 15 and 21 inches of vacuum, the reading should be steady at idle, when the engine is revved and held the vacuum will drop then stabilize to 15-21 inches. The vacuum reading should be taken from a port after the intake butterfly. A Vacuum reading can be a helpful tool for diagnosis especially onvehicles prior to 1996 and OBD2, with OBD2 the computer does a lot of the diagnosis for you.
Wiki User
∙ 14y ago
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