vac secondaries - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
General Tech Have a question that is not covered by one of the other categories? This is the forum for all other items not specifically covered in other categories.

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 02-29-04, 03:56 AM Thread Starter
Registered User
347's Avatar
Join Date: Jul 2003
Location: Sydney
Posts: 651
vac secondaries

A mate of mine thinks his secondaries on his 750 are not working properly.
What can we try/do to see if they are working or not?

What ever I have will never be enough !
Fear is only Fear itself !
347 is offline  
Sponsored Links
post #2 of 3 (permalink) Old 02-29-04, 04:30 AM
RIP Sox.....
Soxx's Avatar
Join Date: Dec 2002
Location: Sydney
Age: 46
Posts: 2,580
Re: vac secondaries

He probably needs a weaker spring inside the vacuum diaphragm.
He'll need to buy a spring kit.

Take the spring out and drive it without it, and see what happens. It will very likely open to early and stumble so you can try different spring tensions and find the right one.


4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?
Soxx is offline  
post #3 of 3 (permalink) Old 02-29-04, 08:46 PM
Registered User
Join Date: May 2002
Posts: 427
Re: vac secondaries

I did this to test mine, its on the holley web site.
still uncertain if they are opening or not you can take a normal paperclip and clip it onto the secondary diaphram rod. You will then push it up against the bottom of the secondary diaphram housing, now you will need to go out and drive the vehicle. When you return you will be able to look at the position of the paperclip on the rod. If it is lower on the rod then you can tell the secondaries opened and how far they opened
jamesk is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech
Gear in this thread - Powered by O'Reilly Auto Parts

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome