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Master Bater
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7,268 Posts
Discussion Starter #1
is there any science to wiring in a resistor? I need to wire in the TAB,TAD, etc that i got from ryan, and since he does not include instructions, or respond to any emails or requests when buying his products, I need to know the proper way.

do you just stick it into the plug, soder them on, what?
 

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Charlie don't surf..
'92 Ford Bronco XLT
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15,279 Posts
I had started a thread a while ago about this same thing. Decided to just live with it throwing the code, so I never got around to ordering the resistors.

Anyway, IIRC, you need to cut the plug from the wire and solder directly to the wires. Let me see if I can dig up that thread.
 

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Super Moderator
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26,374 Posts
yo Plug!

a neat mod by jrichker; "...Put the resistor inside the heat shrink tubing and crimp the connectors on. I would choose the Ford pin connectors since they should plug in the TAB & TAD wiring. That way you haven't modified the wiring so it is easy to re-install the TAB & TAD solenoids if emissions testing comes to your area. 18 gauge crimp on taps
read more and see many pics.
at http://www.stangnet.com/mustang-forums/threads/are-the-tad-tab-vacuum-solenoids-needed.791134/
GL!
 

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Registered
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465 Posts
now will the resistor trick on the TAB and TAD solinoids work on a 96? i know its a dumb question but its OBD2 and didnt know if it makes a differance.
 

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AKA: Butthead
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2,857 Posts
now will the resistor trick on the TAB and TAD solinoids work on a 96?
...dumb question but its OBD2 and didnt know if it makes a differance.
Answering dumb questions with dumb answers is what I'm best at. :)
Try it and get back to us to let us know if it works or not. :)

Only cost you a couple dollars to find out...
http://www.radioshack.com/product/index.jsp?productId=2062293

What resistance are your TAB and TAD solenoids?
If they are much different than ~75 ohms, might need a different resistor?

Butthead in AZ
 

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Premium Member
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4,780 Posts
I have another stupid question regarding these things. How can I test these things to see if they are functioning properly? I had a thread that no one responded to where I think I traced the issues down to these 3 items (TAD,TAB, Air Pump). I pulled vacuum on all the lines coming/going and they held. I've got those codes also but want to get my engine running properly and I assume that includes getting the emissions running back on par. I'd like to get the exhaust smell down and get the engine running back at top performance.

Here's my thread:
http://fullsizebronco.com/forum/showthread.php?t=171591
 

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Super Moderator
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26,374 Posts
yo;
Didn't see your original Post on the DTCs;
553 : Secondary Air Injection Diverter (AIRD) circuit failure KOEO (AM1/TAD)

311 Thermactor air system inoperative (right side)

The 2ndry air system is known to fail in a wide variety of ways. The check valves that prevent hot exhaust from entering the rubber hoses age, rust, leak, & crack open melting the plastic TAB & TAD valves, creating exhaust leaks that can damage other components, raising exhaust oxygen levels (setting lean codes or rich adaptive limit codes), and making rattling noises. The hard steel tubing between the exhaust & the check valve can rust or crack (especially the infamous "crossover tube" on the backs of V8 heads). The vacuum controls leak (including the "coffee can" reservoir on the R wheelwell), get misrouted during other repairs, or the diaphragms rupture. The electronics that control the vacuum controls can fail electrically or mechanically, or the wires can be damaged. But all of these failures are either A) relatively cheap & easy to repair, or B) cheap & easy to prevent with normal inspection & maintenance.
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
by Steve83 (Steve, That dirty old truck) at SuperMotors.net
diagram is for a V8 altho system is functionally equiv.

See this diagram for a 4.9 by Steve83; no year given tho.

--
other possible causes:
Hose from AIR pump leak
AIR bypass solenoid leak/blocked
Hose from AIR pump blocked
AIR bypass solenoid stuck open/closed

Thermactor air system inoperative-right side: "...The code (miesk5 Note; forget the codes for now since it is for an earlier year and model) is an Air Management fault. These particular codes are used for the Thermactor Air Diverter (TAD)/Thermactor Air Bypass (TAB) valve system (Fig. 3). In following the diagnostic tree we were to first check for vacuum lines that could possibly be broken or disconnected. One line was found disconnected. ... We entered the output state check and cycled both the TAB and TAD solenoids on/ off. They both worked correctly. Finally, we supplied vacuum to the solenoid to make sure that the vacuum did not leak down. The TAD solenoid would not hold vacuum. It slowly bled off. We replaced the solenoid..." read more
Source: by tomco-inc


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522 : Vehicle not in PARK or NEUTRAL during KOEO you got this fixed, right?
538 : Insufficient RPM change during KOER dynamic response test - same as above
=======

re: "...The other canister Seemed OK. The hose connecting it to the Air Pump was intact. I was curious though if the tube on top of the wheel well awas supposed to be attached to anything or if it was just an air intake..." That's ok. Its da , air pump's silencer hose and like that in my 96 5.0-
ok, my Cpmcast conn is awful; I have huge lags... and lost info by over-writing,

suggest you buy a Ford Bronco Electrical and Vacuum Troubleshooting Manual (EVTM), Powertrain Controls and Emission Diagnosis Manual (PCED), Service Manual CD from Steve83 or E Bay; has pin point testing in it...unless someone posts the testing here for you.

also see your 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.
I selected da 1st cal # in the Guide;


Vacuum Line Acronyms & Color Codes
Source: by Steve83 (Steve, That dirty old truck), Seabronc (Rosie, Fred W) & miesk5 at Ford Bronco Zone Forums

VRESER is the Vacuum Reservoir Can (Tank)
Thermactor Air Bypass (TAB) Solenoid (SOL V) see my site @ http://www.broncolinks.com/index.php?index=416
Thermactor Air Diverter (TAD) Solenoid (SOL V) see my site @ http://www.broncolinks.com/index.php?index=9
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ACV (Air Control Valve) is the TAD (Thermactor Air Diverter) Valve
AIR BPV is the TAB (Thermactor Air Bypass) Valve
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MAP is da Manifold Absolute Pressure Sensor
EGR is Exhaust Gas Re-circulation Valve
EVP is EGR Valve Position Sensor
EVR is EGR Vacuum Regulator

FPR is Fuel Pressure Regulator; Location DiagramSource: by Ford via subford at photobucket

Carbon Can is da Carbon Canister (Charcoal Canister, Vapor Canister, Evaporative Emission (EVAP) Canister

CPRV is Canister Purge Solenoid Valve; pic
Source: by Ryan M (Fireguy50) at http://fordfuelinjec...images/CANP.jpg

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.supermoto...ry/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 Steve at http://www.supermoto...ry/media/767956

V 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.supermoto.../media/672883_1
PCV is Positive Crankcase Ventilation Valve
MAN VAC is Manifold Vacuum
EFCA is Electronic Fuel Control Assembly
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 Retard Delay Valve
DV-TW = Two Way Delay Valve)
HEAT VLV INT = Heat Vacuum Control Valve Intake, (next to carb)
In an 85;
Red = Main vacuum
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)
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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
V CK V: Vacuum Check Valve
VRDV: Distributor Retard Delay Valve
TVS: Throttle Valve Solenoid (aka Solepot, Dashpot)
TVV: Thermostatic Vacuum Valve (aka Ported Vacuum Switches)
PURGE CV: Vapor Canister Purge Valve
Color Codes to do Vacuum Diagram
Red = Main vacuum
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)
------------
By WEBMASTER at http://www.fordtruck...read.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
V CK V: Vacuum Check Valve
VRDV: Distributor Retard Delay Valve
TVS: Throttle Valve Solenoid (aka Solepot, Dashpot)
TVV: Thermostatic Vacuum Valve (aka Ported Vacuum Switches)
PURGE CV: Vapor Canister Purge Valve
Color Codes to Vacuum Diagram
Red = Main vacuum
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)
------
Source: by Ford motorcraftservice.com
 
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