PL720 4WD L4-2389cc 2.4L SOHC (Z24) (1983)
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Vacuum Delay Valve: Description and Operation
Fig. 16 Vacuum delay valve (typical)
This valve, Fig. 16, prevents a rapid vacuum drop of the EGR control line. The valve is designed for one-way operation and consists of a one-way
umbrella valve and a sintered steel fluidic restricter.