78 bronco vacuum

[joeshmo]

i have a 78 bronco wit the 351m and auto tranny i need to know what vacuum lines need to be hooked up in order to drive and what not and i want as less vacuum lines as possible....right not i have the pcv hooked to the carb and pvc to a 3 way split to the vacuum advance and the tranny vacuum lines....could this be the problem why my bronco wont hold an idle for about 2-3 seconds? or would it be the ignition control module????

 

[Seabronc]

The vacuum advance should be hooked to the carburetor. There should be a small tube on the left side near the top. a line should go from there to the distributor connection. I could be more specific if I knew which carburetor you have.

Good luck,

>-

 

[joeshmo]

i have a 2150 motorcraft and an autto tranny

 

[Seabronc]

I should have asked you th last time to post some pictures of your carb. One from the front of the truck, left side, right side and back, there are some variations in a lot of carbs so it would be better to see it. Also, please reduce the size of the pictures to around 900 x 768.

You should have a calibration chart showing the vacuum system that was on your engine. On that chart, they will show you the proper place to connect the distributor vacuum advance.

>-

 

[miesk5]

yo,

As Fred mentioned, get the Calibration # and post it;

Here is one Vac Diagram;

Diagram in a 78 351M



Source: by 78brncoxlt at SuperMotors.net

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

DIST: Distributor

EGR: Exhaust Gas Recirculator

EFCA: Electronic Fuel Control Assembly/ (Fuel Pressure Regulator (FPR) (not for 78)

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: 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

VRV: Vacuum Regulator 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: Vapor Canister Purge 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)

(DV-TW = Two Way Delay Valve)

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

Color Codes

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