Under the hood mysteries: Distributor Vaccum Control Valve.

[mrgmhale]

Nicely done. I published a YouTube video covering these Ported Vacuum Switch units, (aka Thermal Vacuum switch units), to include a video showing how to test these vacuum switches to make certain ported vacuum is getting to the Distributor Vacuum Advance Diaphragm with the coolant at normal operating temperature. I will be adding your post to my little library.

For anyone needing a Vacuum Schematic for engine emission control vacuum systems for Mustangs from 1967 - 1972, Mustang Barn has provided that information online on a no fee basis. A few years ago, with Mustang Barn's knowledge and approval, I assembled all of their individual Vacuum Schematics (aka Vacuum Calibrations) into a single PDF document that is grouped by year, and sorted by engine. I also have a collection of Vacuum Calibrations for 1973 Mustangs, to include two 351C 4v calibrations not part of the Shop Manual covering the 1973 Calibrations. In addition the Shop Manual Section VI that covers emission control devices, are also available on my Google Drive.

Both the 67-72 and 73 emission control & vacuum calibration files are available on my Google Drive for anyone who may want the information under the following link:

https://drive.google.com/drive/folders/1K6s8NTPj5gP229i5DPfdPxgxedikayty?usp=drive_link

The YouTube videos I posted covering these vacuum switches are found in my YouTube Channel:

https://www.youtube.com/@gilberthale7777


The various videos covering the Thermal/Ported Vacuum Switches and related vacuum circuits and testing techniques are at:


https://youtu.be/LP-o2zSt6rw

https://youtu.be/sLwXlsHBd4k







https://youtu.be/asC2WwV1Sug

 

[smartypants]

Did the car come with A/C from the factory?

no AC.

 

[Hemikiller]

The early emissions configurations can be frustratingly difficult to unravel, as the documentation isn't in the shop manual, but likely buried in some supplement or TSB from Ford to the dealer.

If I were to throw out a guess, given that @Spike Morelli is from California, it would be that this particular DVCV is part of the California emissions tune. @smartypants do you have the Marti for your car?

 

[mrgmhale]

The early emissions configurations can be frustratingly difficult to unravel, as the documentation isn't in the shop manual, but likely buried in some supplement or TSB from Ford to the dealer.

If I were to throw out a guess, given that @Spike Morelli is from California, it would be that this particular DVCV is part of the California emissions tune. @smartypants do you have the Marti for your car?

For anyone needing a Vacuum Schematic for engine emission control vacuum systems for Mustangs from 1967 - 1972, Mustang Barn has provided that information online on a no fee basis. A few years ago, with Mustang Barn's knowledge and approval, I assembled all of their individual Vacuum Schematics (aka Vacuum Calibrations) into a single PDF document that is grouped by year, and sorted by engine. I also have a collection of Vacuum Calibrations for 1973 Mustangs, to include two 351C 4v calibrations not part of the Shop Manual covering the 1973 Calibrations. In addition the Shop Manual Section VI that covers emission control devices, are also available on my Google Drive.

Both the 67-72 and 73 emission control & vacuum calibration files are available on my Google Drive for anyone who may want the information under the following link:

https://drive.google.com/drive/folders/1K6s8NTPj5gP229i5DPfdPxgxedikayty?usp=drive_link

 

[smartypants]

The early emissions configurations can be frustratingly difficult to unravel, as the documentation isn't in the shop manual, but likely buried in some supplement or TSB from Ford to the dealer.

If I were to throw out a guess, given that @Spike Morelli is from California, it would be that this particular DVCV is part of the California emissions tune. @smartypants do you have the Marti for your car?

yes i do have marti