1993-95 Lightning vacuum lines routing diagram with EGR valve la…

Lightning 5.8L Vacuum Lines
IF THE IMAGE IS TOO SMALL, click it.
NOT SHOWN: brake booster hose & check valve, HVAC
To find leaks, use ~3' of garden hose or a mechanic's stethoscope:



For colored hard plastic vacuum lines under the hood:
RED is the Ford standard color for manifold vacuum (the MAP is a notable exception - it's black)
BLACK (hard plastic only, shown Dk.Gray) is the Ford standard color for checked or reservoir vacuum
PINK is the Ford standard color for TAB
YELLOW is the Ford standard color for TAD (different function in the dash)
GREEN is the Ford standard color for EGR
WHITE is the Ford standard color for the fresh/recirc door for the HVAC system



Most trucks use a 3-port check valve which also connects to the HVAC reservoir.
Early coffee-can reservoir shown; '94-up use a superior molded plastic reservoir which is easy-to-find in JYs and an easy swap.

MAP sensor is Motorcraft CX-2403

Before madly ripping out all the emissions systems on your vehicle, read this article to learn how each one benefits the engine.

See also:
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Owner caption January 2018 · Photo 0 of 5000