TSB : 4-Port PVS
Engine Mechanical
Details
On a 4-port PVS valve the top port is connected to a vacuum source. Second port is connected to a vacuum check valve and is then tee'd into vacuum hose to distributor. Third port is connected to EGR valve. Fourth port is connected to a vacuum amplifier. Fig 1: 4-Port PVS System Courtesy of FORD MOTOR CO.
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