yo; according to a pal (I have a 96..so..)
the Yellow Vacuum Line goes from the TAD Solenoid (driver's side forward solenoid) to the TAD (Diverter) Valve located at the rear of the Intake Manifold. You have to climb up onto the engine to feel the Diverter Valve or remove the Intake Manifold
Also see Secondary Air Injection system
See your Vehicle Emission Control Information (VECI) Decal,
it has Vacuum Diagrams & Calibration Parts List.
It used to be On-Line for Free at Ford.
Vacuum Diagram is the same as the one on the core support or hood or air filter cover.
Source: by Ford motorcraftservice.com
I picked the first CAL # one out fo ya as a test and got this diagram;
Diverter & Bypass Valves, Hoses, Crossover Tube, EGR Valve, PCV Port & Smog Pump Location pic in an 88 F 150 5.0
Have to roll now; working on Bronco since weather is good! adding some nice HD SS Muffler clamps to the Original system! This is great stuff... Walker made great stuff and still does.
VRESER is the Vacuum Reservoir Can (Tank);
Location in Self Test Video in an 86; the "right side" (passenger) near the AC/Ventilation Systems Vacuum Tank Source: by JKossarides ("The Bronco\", Jean) at SuperMotors.net
Location pic in mid 80s; the "right side" (passenger) near the AC/Ventilation Systems Vacuum Tank (black plastic ball type)
TAB is the Thermactor Air Bypass Solenoid
TAD is the Thermactor Air Diverter Solenoid
MAP is Manifold Absolute Pressure Sensor;
Location pic in an 88 Source: by Jem270 at SuperMotors.net
EGR is Exhaust Gas Re-circulation Valve;
Location & Block-Off Plate pic in an 89 Source: by Tim C (TnTbronco2, Trail Truck, Street Truck, Crazed, Broke, OoG) at SuperMotors.net Passenger side of engine; front
EVR is EGR Vacuum Regulator ; url="
http://www.supermotors.net/registry/media/71668"]Location pic in mid 80s; the "right side" (passenger) near the AC/Ventilation Systems Vacuum Tank (black plastic ball type) and see jean's Video, above.
FPR is Fuel Pressure Regulator;
Location DiagramSource: by Ford via subford at photobucket
Carbon Can is the Carbon Canister (also called, Charcoal Canister, Vapor Canister, Evaporative Emission (EVAP) Canister); see it in that Location & Vacuum Hose Routing Video in an 86 5.0
Source: by JKossarides ("The Bronco", Jean) at SuperMotors.net
CPRV is Canister Purge Solenoid Valve
V REST on later years is Vapor Valve (Roll-Over); Depictions & Location Diagrams in 5.0, 5.8, 7.5, & 4.9; "...All fuel tank vapor valves make use of a small orifice that tends to allow only vapor and not fuel to pass into the line running forward to the vapor storage canister. This assembly mounts directly to the fuel tank using a rubber seal. Fuel vapors trapped in the sealed fuel tank are vented through the orificed vapor valve assembly in the top of the tank. The vapors leave the valve assembly through a single vapor line and continue to the carbon canister for storage, until they are purged to the engine. The vapor valve assembly mounted on the top of the fuel tank is used to control the flow of fuel vapor entering the fuel tank vapor delivery line which conducts vapor forward to the canister in normal circumstances. If due to extreme conditions, excessive pressure is generated inside the tank, the purge port opens up, allowing fuel vapor to escape to the atmosphere, and stabilizes pressure inside the tank. The valve assembly has a head valve which prevents the fuel tank from overfilling during refueling operation. The valve assembly also has a spring supported float assembly, which prevents liquid fuel from entering the vapor delivery line during severe handling, steep grades or in the event of vehicle rollover. The fuel fill cap is sealed and includes a built-in pressure-vacuum relief valve. Fuel system vacuum relief is provided after 3.5 kPa (0.50 psi) and pressure relief after 11.0 kPa (1.6 psi). Under normal operating conditions, the fill cap operates as a check valve, allowing air to enter the tank as fuel is used, while preventing vapors from escaping the tank through the cap..." by Ford via Steve83 at
http://www.supermotors.net/registry/media/283481
Vapor Valve (V REST) pics in 5.0, 5.8, & 4.9...The smaller valve uses a thicker grommet to fit in the same hole as the larger one..." by Ford via
http://www.supermotors.net/registry/media/767956
REST on earlier years such as SEABRONC's 83 is a Vacuum Restictor/delay valve, it delays vacuum for a certain amount of time. See his Vacuum Line Diagram (modified to reflect changes He made) at
http://www.supermotors.net/registry/media/672883_1
MAN VAC is Manifold Vacuum
CAT is the catalytic converter
ENG is the engine
more by our PAL SEABRONC & Steve83 (includes Carbureted Models)
SV CBV = Carborator Fuel Bowl Solenoid Vent Valve
LCV = EGR Load Control
WOT =Wide Open Throttle) Valve
HICV = Hot Idle Control Valve
IVV = Thermactor Idle Vacuum Valve
VRDV = Vacuum Delay Valve (VDV, VRDV, DV-TW)
VDV = Vacuum Delay Valve)
VRDV = Distributor ****** Delay Valve
DV-TW = Two Way Delay Valve)
HEAT VLV INT = Heat Vacuum Control Valve Intake, (next to carb)
======================
COLOR CODES by our PAL SEABRONC! - Some are in an 83; & probably Carbureted engines
Red = Main vacuum from Intake Manifold to Coffee can
Green = EGR function
Orange = Heat control Valve (exhaust & intake) (AKA heat riser but more complex)
Yellow = Distributor advance
White = EGR vacuum (source)
Black = Mainly used for the Evaporative emissions control
Black = Thermactor ACV or diverter valve
Blue = Throttle Kicker control
Pink = Thermactor Air Bypass Valve (BPV)
..
Late Model Years; By Ford via
http://www.supermotors.net/registry/media/589993
Black = Vacuum Reservoir Can (Tank) (VRESER) to TAD & TAB
Red = Main vacuum from Intake Manifold to Vacuum Reservoir Can (Tank) (VRESER)
Yellow = from TAD to Combined Bypass and Diverter Valve. located at the rear of the Intake Manifold
Pink = from TAB to Combined Bypass and Diverter Valve (se Seattle FSB info below)
==========
"...The Pink Vacuum Line goes from the TAB Solenoid (driver's side rear solenoid) to the passenger side (adjacent to the Vacuum Reservoir Can) and down to the bottom of the TAB (Bypass) Valve. Note that my Pink Vacuum line appears Yellowish in this pic and is not yet connected to the base of the TAB Valve as I was working up a solution at the time.
Vacuum Diagram in a 90 5.8
Source: by Seattle FSB (SeattleFSB)
http://fullsizebronco.com/forum/showthread.php?t=170303
=============
by AsianSpanker:
CL: Located in the air cleaner
A/CL DV: Air Cleaner Diverter Valve
A/CL BI MET: Air Cleaner Bi-Metallic Valve
A/CL CWM: Air Cleaner Cold Weather Modulator
ACV: Air Control Valve
AIR: Ford calls this the Thermactor, short for Thermal Reactor. CA vehicles are installed with it as standard. Air Injection Reaction is what it stands for.
AIR BPV: Air Bypass Valve (aka Thermactor Air Bypass TAB)
BV: Bowl Vent (on top of the float tanks)
CARB: Carburetor
CPRV: Canister Purge Valve
DIST:
EGR: Exhaust Gas Recirculator
EFCA:
FLTR: Filter
FPR: Fuel Pressure Regulator
IVV: Thermactor Idle Vacuum Valve
MAN VAC: Indicating Manifold vacuum-Vacuum source
MAP: Manifold Absolute Pressure
SOLV: Solenoid Valve
SV-CBV: Carburetor Fuel Bowl Solenoid Vent Valve
VAC:
VCKV: Vacuum Check Valve
VRESER: Vacuum Reservoir Solenoid Valve it is the vacuum resevoir
VRV:
V CK V: Vacuum Check Valve
VRDV: Distributor ****** Delay Valve
TVS: Throttle Valve Solenoid (aka Solepot, Dashpot)
TVV: Thermostatic Vacuum Valve (aka Ported Vacuum Switches)
PURGE CV: Vapor Canister Purge Valve
-----------------
By WEBMASTER at
http://www.fordtruckclub.net/forum/showthread.php?t=1703
A/CL: Located in the air cleaner
A/CL DV: Air Cleaner Diverter Valve
A/CL BI MET: Air Cleaner Bi-Metallic Valve
A/CL CWM: Air Cleaner Cold Weather Modulator
ACV: Air Control Valve
AIR: Ford calls this the Thermactor, short for Thermal Reactor. CA vehicles are installed with it as standard. Air Injection Reaction is what it stands for.
AIR BPV: Air Bypass Valve (aka Thermactor Air Bypass TAB)
BV: Bowl Vent (on top of the float tanks)
CARB: Carburetor
CPRV: Canister Purge Valve
DIST:
EGR: Exhaust Gas Recirculator
FLTR: Filter
FPR: Fuel Pressure Regulator
IVV: Thermactor Idle Vacuum Valve
MAN VAC: Indicating Manifold vacuum-Vacuum source
MAP: Manifold Absolute Pressure
SOLV: Solenoid Valve
SV-CBV: Carburetor Fuel Bowl Solenoid Vent Valve
VAC:
VCKV: Vacuum Check Valve
VRESER: Vacuum Reservoir Solenoid Valve
V CK V: Vacuum Check Valve
VRDV: Distributor ****** Delay Valve
TVS: Throttle Valve Solenoid (aka Solepot, Dashpot)
TVV: Thermostatic Vacuum Valve (aka Ported Vacuum Switches)
PURGE CV: Vapor Canister Purge Valve
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