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Discussion Starter · #1 ·
I'm putting an 86 5.0 into my 83 Bronco that had a 5.8. The issue is that I am planning to move to Henderson/Vegas which has smog. Since I'm building this truck from a roller I have to source all smog equipment and figure out what is required to get it to pass. I have no issues running smog stuff but it is a pain trying to figure out what the laws are in regards to a 5.0 replacing the 5.8 on top of the fact that I have no idea what equipment I need or what is missing.

So far all the stuff I have bought has been factory ford stuff from 83-85 Mustangs in regards to intake and carb. I need to figure out the smog pump and other devices. Can this be done for less then $500?

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33,938 Posts
If you can get all the right stuff from a yard 86 5.0
others can give you the info on laws there; or search for NV state and find vehicle section
update; while I went outside @ shot @ something in da bushes..
Nevada uses On-Board Diagnostics (OBDII) Testing for 1996 and newer vehicles. The operator will connect an analyzer to the OBD computer in your vehicle. Data from your vehicle will indicate whether its emissions systems are operating properly and within emissions limits.

Older vehicles are tested with a Two-Speed Idle Test. The operator will test your vehicle once at idle speed, then test it again with the engine running at approximately 2500 rpm.

Clark County
The vehicle must be repaired by a 2G Licensed Authorized Station to be eligible for a waiver. The waiver application must include receipts from the station showing that at least $450 has been spent on parts other than a catalytic converter, fuel inlet restrictor or air injection system, or on labor other than emission testing if the repairs evidenced by the receipt were directly related to the deficiency in emissions.

If the vehicle is not repaired at an authorized 2G station, it will not be eligible for a waiver, regardless of the cost incurred. See Business License Verification for a list of stations.

to begin;

Vacuum Line Routing Diagram in a 83 351W

Source: by Seabronc (Rosie, Fred W) at

Vacuum Line Routing Diagram in a 86 5.0 EFI

Source: by Steve83 (Steve, That dirty old truck) at

Vacuum Diagram Color Codes:
Red = Main vacuum
Green = EGR function
Orange = Heat control Valve (exhaust & intake) (AKA heat riser but more complex for carbed mostly)
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 = TAD to Thermactor Air Bypass Valve (TAB or AIR BPV) /AIR Bypass (AIRB) valve
NOTE: AIR BPV is the AIR Bypass (AIRB) Valve; also called the TAB (Thermactor Air Bypass) Valve in other years/diagrams
TAB TAD maybe be located in the 86;
in Self Test Video in an 86; the "right side" (passenger) near the AC/Ventilation Systems Vacuum Tank (black plastic ball type)
Source: by JKossarides ("The Bronco", Jean) at
ACV (Air Control Valve) is the TAD (Thermactor Air Diverter) Valve (AIR Bypass (AIRB) and AIR Diverter (AIRD) valve combinations

or next to coil, such as
Location pic in a 90 5.8

Source: by SeattleFSB (Seattle FSB) at

MAN VAC is Manifold Vacuum
FPR is Fuel Pressure Regulator
EGR is Exhaust Gas Re-circulation Valve

Thermactor Air Diverter (TAD) Solenoid (SOL V) (AIRD) see http://www.broncolin...x.php?index=905
Thermactor Air Bypass (TAB) Solenoid see http://www.broncolin...x.php?index=904

EVR is EGR Vacuum Regulator

VRESER is the Vacuum Reservoir Can (on top of Gas Tank);

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

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

MAP is da Manifold Absolute Pressure Sensor

AIR BPV is the AIR Bypass (AIRB) Valve; also called the TAB (Thermactor Air Bypass) Valve
CPRV is Canister Purge Solenoid Valve/ Canister Purge Solenoid (CANP) is controlled by the PCM to vent fumes from the charcoal canister to intake manifold only when the engine is running; pic in a 90 by Seattle Bronco at http://www.supermoto...ry/media/795183

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

VCKV is Vacuum Check Valve

CAT is the catalytic converter

ENG is the engine

PCV is Positive Crankcase Ventilation Valve

acronyms (not nec. for your year/engine)
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: Thermactor, short for Thermal Reactor. CA vehicles are installed with it as standard. Air Injection Reaction is what it stands for.

AIR BPV: AIR BPV is the AIR Bypass (AIRB) Valve; also called the TAB (Thermactor Air Bypass) Valve

BV: Bowl Vent (on top of the float tanks)

CARB: Carburetor

CPRV: Canister Purge Valve

CBD: Closed Bowl Distributor

DIST: Distributor

DV-TW = Two Way Delay Valve

EGR: Exhaust Gas Recirculation

EFCA: Electronic Fuel Control Assembly/ (Fuel Pressure Regulator (FPR)
FLTR: Filter

FPR: Fuel Pressure Regulator

HEAT VLV INT = Heat Vacuum Control Valve Intake, (next to carb)

HICV = Hot Idle Control Valve

IVV: Thermactor Idle Vacuum Valve

LCV = EGR Load Control (WOT =Wide Open Throttle) Valve)

MAN VAC: Manifold vacuum-Vacuum source

MAP: Manifold Absolute Pressure

PURGE: Vapor Canister Purge Valve

PV: Ported Vacuum

PVS: Ported Vacuum Switch (PVS) Valve

PCV - Positive Crankcase Ventilation

SA-FV - Separator Assembly Fuel/Vacuum

SOLV: Thermactor Solenoid Valve

SV-CBV: Carburetor Fuel Bowl Solenoid Vent Valve

TCP: Temperature Compensated Accelerator Pump

VAC: Vacuum

VCKV: Vacuum Check Valve

VRESER: Vacuum Reservoir Solenoid Valve

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

VCV - Vacuum Control Valve

VRV: Vacuum Regulator Valve

V CK V: Vacuum Check Valve

VOTM - Vacuum Operated Throttle Modulator

VRDV: Distributor Retard Delay Valve

TVS: Throttle Valve Solenoid (aka Solepot, Dashpot)
TVS: Temperature Vacuum Switch

TVV: Thermostatic Vacuum Valve (aka Ported Vacuum Switches)

VRDV = Vacuum Delay Valve (VDV, VRDV, DV-TW)

VDV = Vacuum Delay Valve

Vacuum Leak Test; On an idling engine check for vacuum leaks using a mechanic's stethoscope with the probe removed, or a ~3' garden hose section. On COLD ENGINE only, use propane torch w/rubber hose attached, UNLIT or spray carb cleaner, when it gets to the the leak the RPMs will rise. Also check: vacuum hoses; intake manifold gasket & throttle body; PCV line; vacuum reservoirs: EGR Sys Vacuum Tank & 2ndry air (coffee can); AC, heater, defroster, vent control ckt & vacuum tank (plastic ball type), under dash & lines to heat/blend/etc. doors; power brake booster; cruise control ckt, etc. Where applicable; BEWARE OF BELTS/PULLEYS, FAN AND HOT ENGINE
Source: by miesk5

Vacuum Line (Hose) Sourcing; "...Get the Silicone Boost/Vacuum Hose Engine Dress Up Kit and then an additional 10' of 4mm vacuum hose in the color of your choice. I used wire loom to protect the hose through the Intake Manifold, to the Diverter Valve and where it rubs on the Intake to the EVP: Silicone Intake Systems..."
Source: by Seattle FSB (SeattleFSB) at FSB
Vacuum Line (Hose) Sourcing; "...They sell hard plastic line at most parts stores now, in the HELP! section with the rest of the vacuum fittings. Most places have it near the bottom of their display, and it's not too expensive. The b!tch is forming the stuff to the shape or routing you need. I've not had the time to test it, but I believe a little heat might allow you to bend 'er into the correct shape. I should email Motormite/Dorman about that...Rubber lines collapse in long runs under low pressure (high vacuum), which is why Ford and most other manufacturers went to plastic lines. They're cheap to make, and form easily. Plus with the polymer they're made from, you can color code the lines for easier assembly line installation..."
Source: by SigEpBlue

For a YARD SEARCH on-line, I use;
Select All Parts
year, etc, then FORD TRUCK
HAS PICS of the Broncos!!!

Chandler, AZ
Carson City

Also for obsolete parts;
Our Sponsor here has been adding some to inventory; Jeff's Bronco Graveyard
and: by Ford pn:

· Registered
274 Posts
Discussion Starter · #3 ·
Wow. That is amazing. I have a lot of reading to do after work tonight. Thank you very much

· Super Moderator
33,938 Posts
yo, yw

Also; for just $15.00 or less via google search; from Ford via suthorized Ford publisher, HELMS
1983 Bronco Wiring Diagram
Price: $15.00 In Stock
Pkg Qty: 1
(English, Paper, 365198O83)
Detailed wiring schematics, illustrations and component descriptions developed by Ford Motor Company. Information contained in each vehicle specific manual, has been developed to aid technicians in diagnosing and repairing vehicle wiring and electrical systems. Each manual covers the entire vehicle bumper to bumper including connectors, splices, grounds and component location and testing.
Complete Schematic Illustrations Of The Electrical Wiring System

1983 Light Truck Specifications Book
Price: $18.00 In Stock
Pkg Qty: 1
(English, Paper, 36532283)
Service Specifications Manuals from Ford Motor Company are a quick reference guide for all passenger cars and trucks. Each book covers all specifications bumper to bumper, includes component locations, part numbers, tolerances, dimensions and torque specifications.

1983 Bronco Owner Manual
Price: $19.00 In Stock
Pkg Qty: 1
(English, Paper, 36532583)
Click here for detail
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