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Discussion Starter · #1 ·
These are all of the acronyms I found on my vacuum diagram under the hood. I got a Chilton's manual but the vacuum diagram in that is harder to read than the underhood sticker. :doh0715: Is there anywhere that I can find out what all of these acronyms mean? There are A LOT of lines not hooked up. Thanks.

A/CL DV
A/CL BI MET
ACV
MAN VAC
EXH HCV
PCV
SV CBV
TVV
LCV
VDV
HICV
IVV
VRDV
TVS
VCV
HEAT VLV INT
TK
FLTR
VRDV
AIR BPV

ON CARB
BV
S
ACT
 

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Those are just "abbreviations" - an "acronym" is an abbreviation that can be pronounced as a word, like LASER, SCUBA, WYSIWYG, & HMMWV.

Automotive Terms & Abbreviations

A/CL DV - Air Cleaner Diverter Valve
A/CL BI MET - Air Cleaner BiMetallic valve
ACV - Air Control Valve
MAN VAC - Manifold Vacuum
EXH HCV - Exhaust Heat Control Valve
PCV - Positive Crankcase Ventilation
SV CBV - Solenoid Valve Carborator Bowl Vent
TVV - Thermal Vacuum Valve
LCV - EGR Load Control Valve
VDV - Vacuum Diverter Valve
HICV - Hot Idle Control Valve
IVV - Thermactor Idle Vacuum Valve
TVS - Throttle Valve Solenoid (aka SolePot, Dashpot)
VCV - Vacuum Control Valve
HEAT VLV INT - Heat Valve Intake
TK - Throttle Kicker
FLTR - uuuuuuhhh... "Filter" :shrug
VRDV - Distributor Vacuum Retard Delay Valve
AIR BPV - Air ByPass Valve (aka Thermactor Air Bypass = TAB)

BV - Bowl Vent
S - Spark port
ACT - not sure, but on EFIs it means Air Charge Temperature sensor
 

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Discussion Starter · #3 ·
Steve83 said:
Those are just "abbreviations" - an "acronym" is an abbreviation that can be pronounced as a word, like LASER, SCUBA, WYSIWYG, & HMMWV.

A/CL DV - Air Cleaner Diverter Valve
A/CL BI MET - Air Cleaner BiMetallic valve
ACV - Air Control Valve
MAN VAC - Manifold Vacuum
EXH HCV - Exhaust Heat Control Valve
PCV - Positive Crankcase Ventilation
SV CBV - ?
TVV - Thermal Vacuum Valve
LCV - ?
VDV - Vacuum Diverter Valve
HICV - ?
IVV - ?
TVS - Throttle Valve Solenoid (aka SolePot, Dashpot)
VCV - Vacuum Control Valve
HEAT VLV INT - Heat riser Valve ...?
TK - Throttle Kicker
FLTR - uuuuuuhhh... "Filter" :shrug
VRDV - ?
AIR BPV - Air ByPass Valve (aka Thermactor Air Bypass = TAB)

BV - Bowl Vent
S - Spark port
ACT - not sure, but on EFIs it means Air Charge Temperature sensor
Thanks for the information. Hopefully now I can find out where all of these are and make sure that they're all hooked up properly. There are quite a few ports that are empty. Never a good sign.
 

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Infinite Grade said:
These are all of the acronyms I found on my vacuum diagram under the hood. I got a Chilton's manual but the vacuum diagram in that is harder to read than the underhood sticker. :doh0715: Is there anywhere that I can find out what all of these acronyms mean? There are A LOT of lines not hooked up. Thanks.


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)


ON CARB
ACT = Are you sure this isn't ALT, if so It is the port used with the altitude compensation system
 

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Maybe someone with the same engine could help by taking some pictures to help explain where the vacuum lines go and hook up to? A picture's worth a thousand words.
I've tried looking up diagrams on line or in my manuals and can't find any.
 

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AbandonedBronco said:
Maybe someone with the same engine could help by taking some pictures to help explain where the vacuum lines go and hook up to? A picture's worth a thousand words.
I've tried looking up diagrams on line or in my manuals and can't find any.
The vacuum lines are color coded and laid out as though you are looking at the engine when standing infront of the truck. Each color code represents a different function (in most cases) and the same color line is used on the engine as in the diagram. However, black gets used in a few places that are not associated. The easiest way to deal with rebuilding the vacuum lines is to do one function at a time. The most complex vacuum line layout is on carbed engines of the mid to late 80's. The vacuum diagram is located on the right side of the radiator support (for the US that is the passenger side).

Unfortunately not all engines have the same calibration so the devices and hookups change even between different trucks of the same year and engine. So a writeup on one truck / diagram can only serve as an example not the, "End All", for all trucks. Some of the devices are calibrated for different temperature operating ranges which is indicated by color coding of the device. So I hope you can see that your request would be much more than a write up, more like a book in order to cover all calibrations. :rolleyes:

If you need help, post a picture of the diagram on your truck and I'm sure that anyone who knows how to interpret it can talk you thru it. The best thing to do is to get a real Ford shop manual for your year truck. Volume HT, (Engine / Emissions Diagnosis), contains a complete explanation of the variuous devices plus how to test them.

Here is a typical diagram for a 85 351.

Color function in this 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)

The color in this photo isn't as good as I would like, sorry.
 

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Here is an color enhanced version of the above diagram. A little crude but the best I can do right now.

The line colored blue in this diagram is infact supposed to be black. The dashed line from the TK (Throttle Kicker) is blue.
 

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My suggestion for getting the Ford shop manual is not for you to see how to hook up the lines but to give you an understanding of how each function works. Armed with that information, future troubleshooting of the vacuum system should be much easier. The pictures I attached were only for an example of the color coded lines.

Like Steve said, you need to follow the diagram on your truck.
 

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Vacuum Ports





Hey, just posting these photos for Infinite Grade as his computer at home is down. He checked all of his vacuum diagram and most of it appeared to be hooked up except for these three ports. Where on the vacuum diagram are these and what do they hook up to? This is on the 5.8 H.O.
 

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Discussion Starter · #11 ·
AbandonedBronco said:
Hey, just posting this photo for Infinite Grade as his computer at home is down. He checked all of his vacuum diagram and most of it appeared to be hooked up except for these two ports. Where on the vacuum diagram are these and what do they hook up to? This is on the 5.8 H.O.
Thanks for posting that. Also, there is a port on the carb that is not connected that looks like it goes to some kind of advance. It pushes a little bit against the throttle. There's also a second port on the carb not hooked up that I will try to get pictures of when I can (or at least a description as I don't know when my computer will be up.)
 

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Those aren't vacuum ports - they're Thermostatic Vacuum Valves (TVV), and they should be labelled that way on your diagram. They'll probably also be shown in color.

The 1st one on the carb sounds like either a dashpot or a WOT valve. Also, not a "vacuum port".

A "vacuum port" is a source of vacuum; either directly into the manifold, carb, or throttle body.
 

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Steve83 said:
Those aren't vacuum ports - they're Thermostatic Vacuum Valves (TVV), and they should be labelled that way on your diagram. They'll probably also be shown in color.

The 1st one on the carb sounds like either a dashpot or a WOT valve. Also, not a "vacuum port".

A "vacuum port" is a source of vacuum; either directly into the manifold, carb, or throttle body.
On the vacuum diagram, the TVVs are labeled as having only one in and one out. Secondly, on most car parts sites, like schucks.com, they are called Ported Vacuum Switches.

Such as:
http://www.partsamerica.com/ProductList.aspx?parttype=285&searchfor=Ported+Vacuum+Switch&ptset=A
 

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AbandonedBronco said:
Hey, just posting these photos for Infinite Grade as his computer at home is down. He checked all of his vacuum diagram and most of it appeared to be hooked up except for these three ports. Where on the vacuum diagram are these and what do they hook up to? This is on the 5.8 H.O.
Those valves are labled VCV in your diagram and the picture is in the same order in the picture as they are on the engine from front to back. The tapered part that is colored solid black is the bottom of the valve.

As far as the carb ports go, The BV ports are the ones that are on top of the float tanks, the EGR port is the one so the passenger side by the choke controls, the S port is any one of the small ports under the carb., The largest port is for the altitude feature which most installations don't have hooked up just capped off. The PVC valve hooks to whatever one it will fit on. All the ports under the carb are at the same vacuum level. The only one that is at a different level is the EGR port. The purge and PCV are hooked to the ports provided by the EGR spacer. Anything else is capped off.
 

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Here's what I have.

VACUUM DIAGRAM ACRONYMS

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
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
VRV:
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)
 

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CARB: Carburetor
Yes, as an abbreviation on the vacuum map. But as an acronym, CARB is California Air Resources Board. That's one example where an abbreviation is VERY different from an acronym.
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.
The "thermactor" is the catalytic converter, and it's standard on almost ALL vehicles after ~'75. "Air injection reaction" is the GM name for what Ford calls "upstream air", which is what the TAD controls.
 

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89 351 vacuum line

I'm also looking for a diagram for vac lines. The previous owner must have removed any diagram from under the hood, as I see none. I have taken a couple pics to show the ones I am concerned about, but I'm not sure how or where to post them. Thanks.
 
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