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  #1  
Old 05-17-2008, 12:14 PM
Deutsch Autogeliebter
 
Join Date: May 2008
Location: va
Posts: 19
Question Vacuum Help

I have a 81 300d the vacuum system drops from 15hg to 0hg immediately when I apply throttle.This model does not have a bowden cable or pressure rod.The way I understand the vacuum system the vacuum should drop according to throttle position.Any help would be appreciated.

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  #2  
Old 05-17-2008, 03:04 PM
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Join Date: Sep 2004
Posts: 8,971
Do you have a 3/2 valve on the top of the valve cover?
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Old 05-17-2008, 03:42 PM
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Join Date: Jan 2002
Posts: 18,350
Where are you measuring the vacuum?
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1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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  #4  
Old 05-17-2008, 08:34 PM
Deutsch Autogeliebter
 
Join Date: May 2008
Location: va
Posts: 19
Helo, yes i have three of the 3/2 valves on the valve cover.I was testing the vacuum at the last T where the transmission line connects after the 3/2"s should have done there thing.The vacuum did not stay even it bounced around a bit at idle but droped fast and smooth as soon as throttle was applied.
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  #5  
Old 05-17-2008, 08:40 PM
Deutsch Autogeliebter
 
Join Date: May 2008
Location: va
Posts: 19
One more question are we reading vacuum in hg. in. or hg. cm?

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