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vaclinesefi.jpg | Hits: 37239 | Posted on: 11/6/11 | View original size (344.83 KB)

Typical EFI Vacuum Lines (V8 shown; I6 similar)
IF THE IMAGE IS TOO SMALL, click it.
NOT SHOWN: brake booster hose & check valve, or pre-'93 vacuum cruise servo
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 (different function in the dash) for manifold vacuum (the MAP, HVAC, VMV, & brake booster are notable exceptions - they're black, but also larger than the colored 5/32" hard lines)
BLACK (5/32" hard plastic only, shown Dk.Gray) is the Ford standard color for checked or reservoir vacuum
PINK is the Ford standard color for TAB (Wh/Or wire)
YELLOW is the Ford standard color (different function in the dash) for TAD (Br wire)
GREEN is the Ford standard color for EGR (Br/Pk wire)
WHITE is the Ford standard color for the fresh/recirc door for the HVAC system

Early 2-port HVAC check valve shown. Most trucks use a 3-port check valve which also connects to the HVAC reservoir.
Early coffee-can reservoir shown; '96-up use a superior molded plastic reservoir (4C3Z9E453AA) which is easy-to-find in JYs and an easy swap.
'94-up MAF engines (MAF was optional '94-95) do not use a MAP sensor.
'96 engines do not use TAB, TAD (no secondary air system), or CANP (not shown); they use VMV (not shown) where the MAP is shown.

MAP sensor is Motorcraft CX-2403 for all engines '87-95 (except '94-95 MAF)

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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