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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![vaclinesefi.jpg 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:
[url=https://www.supermotors.net/registry/media/998125][img]https://www.supermotors.net/getfile/998125/thumbnail/stethoscope.jpg[/img][/url]
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 ([url=https://www.amazon.com/dp/B005H7OIB8]4C3Z9E453AA[/url]) 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 [url=https://www.amazon.com/dp/B004A2BE9K/]Motorcraft CX-2403[/url] for all engines '87-95 (except '94-95 MAF)
Before madly ripping out all the emissions systems on your vehicle, read [url=http://www.fourdoorbronco.com/board/showthread.php?5427-Emissions-Systems]this article[/url] to learn how each one benefits the engine.
See also:
[url=https://www.supermotors.net/registry/media/1172136][img]https://www.supermotors.net/getfile/1172136/thumbnail/cruisevacpedals.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1090170][img]https://www.supermotors.net/getfile/1090170/thumbnail/siliconevac.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1151310][img]https://www.supermotors.net/getfile/1151310/thumbnail/09vacsilicone.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1055574][img]https://www.supermotors.net/getfile/1055574/thumbnail/pcv93.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/894692][img]https://www.supermotors.net/getfile/894692/thumbnail/cruiseservoearly.jpg[/img][/url] . [url=https://www.supermotors.net/vehicles/registry/media/858380][img]https://www.supermotors.net/getfile/858380/thumbnail/veci.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/280795][img]https://www.supermotors.net/getfile/280795/thumbnail/brake-booster-cutaway.jpg[/img][/url] . [url=https://www.supermotors.net/vehicles/registry/media/72428][img]https://www.supermotors.net/getfile/72428/thumbnail/vacuum-94-5.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/589993][img]https://www.supermotors.net/getfile/589993/thumbnail/secondaryair.jpg[/img][/url] . [url=https://www.supermotors.net/vehicles/registry/media/252396][img]https://www.supermotors.net/getfile/252396/thumbnail/secondaryair50l.jpg[/img][/url] . [url=https://www.supermotors.net/vehicles/registry/media/894688][img]https://www.supermotors.net/getfile/894688/thumbnail/intakev8efi.jpg[/img][/url] . [url=https://www.supermotors.net/vehicles/registry/media/148979][img]https://www.supermotors.net/getfile/148979/thumbnail/5.8l-tad.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/900088][img]https://www.supermotors.net/getfile/900088/thumbnail/vacsols.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1166439][img]https://www.supermotors.net/getfile/1166439/thumbnail/hvacvac.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/931421][img]https://www.supermotors.net/getfile/931421/thumbnail/coffeecanopen.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/545664][img]https://www.supermotors.net/getfile/545664/thumbnail/vacres9497.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/767412][img]https://www.supermotors.net/getfile/767412/thumbnail/recircline.jpg[/img][/url]](https://www.supermotors.net/getfile/894687/fullsize/vaclinesefi.jpg)