yo Larry,
If no one can give you better info;
Try here first;
Vehicle Emission Control Information (VECI) Decal, Vacuum Diagrams & Calibration Parts List for 88 & UP. On-Line for Free at Ford. Click "Quick Guides" in left panel; Scroll to & CLICK VECI Labels "Provides Vehicle Emission Control Information (VECI) and a related calibration parts list." Enter applicable info (need to know your Calibration number from your B-pillar sticker).
Vacuum Diagram is the same as the one on the core support or hood or air filter cover.
Source: by Ford motorcraftservice.com
http://www.motorcraftservice.com
Then look @ the Vac Diagram and compare colors to the compents on the diagram
Vacuum Line Acronyms & Color Codes
Source: by Steve83 (Steve, That dirty old truck), Seabronc (Rosie, Fred W) & miesk5 at Ford Bronco Zone Forums
http://broncozone.com/topic/20203-egr/page__gopid__106496entry106496
an excerpt of just some colors:
Red = Main vacuum (from intake manifold)
Green = EGR function
Orange = Heat control Valve (exhaust & intake) (AKA heat riser but more complex)
Yellow = Thermactor Air Diverter Solenoid (TAD)
White = EGR vacuum (source)
Black = Mainly used for the Evaporative emissions control
Black = Thermactor ACV or Diverter valve
Blue = Throttle Kicker control (miesk5 note ?)
Pink = Thermactor Air Bypass Valve (BPV)
next is to go thru the Emissions Section in my site and look under the various sections for the info;
http://www.broncolinks.com/index.php?index=24
such as;
Air Injection (AIR), Secondary Air Injection; Pump (Smog Pump), Thermactor Air Bypass (TAB) & Thermactor Air Diverter (TAD) Solenoids; Diverter, Check & Bypass Valves, Cross-Over Tube, etc.
http://www.broncolinks.com/index.php?index=416
Secondary Air Injection system consists of a belt-driven Air Pump, single or dual AIR Diverter valve(s), an AIR Bypass valve, and AIR Bypass solenoids, air silencer/filter, Powertrain Control Module and connecting wires and vacuum hoses. The Belt-Driven Secondary Air Injection system provides either upstream/bypass air or upstream/downstream/bypass air. The number of these system configurations vary significantly with AIR Bypass and AIR Diverter valve combinations (Figure 179). 2. The PCM provides one or more signals that enable one or more AIR Bypass solenoids. 3. The AIR Bypass solenoids control one or more AIR Bypass valves and/or AIR Bypass Diverter Valves in order to route secondary air depending upon the specific configuration. 4. The belt-driven Air Pump is operational any time the engine is running..." read more
Source: by Steve83 (Steve, That dirty old truck) at
http://www.supermotors.net/registry/media/589993
here you'll see aa diagram shoing color codes such as PINK, Thermactor Air Bypass Valve (BPV)
and RED for Main Vacuum from Coffee can to Intake, and so on
&
Location pic in an 88 5.8; "...TAD/TAB sensor located towards back. both connectors are slightly different so once again only plug into one place..."
Source: by Travis L (kemicalburns) at
http://www.supermotors.net/clubs/superford/registry/media/157925
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"...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