Trans vacumn lines ????
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Tuned
Joined: Jul 2006
Posts: 426
Likes: 5
From: Kennett Square Pa
Trans vacumn lines ????
Noticed there are 2 metal lines at fire wall coming up. One has nothing one has a line but is unplugged are both suppose to be plugged in and to where
Running a c6 351m with performer RPM intake and edlebrock carb
Running a c6 351m with performer RPM intake and edlebrock carb
Mountain Pass
Joined: Jun 2004
Posts: 241
Likes: 0
From: Canada
Below find a very good explanation. You need a line running from the intake manifold to the rear of the modulator. The other line plugs into the side of the modulator and into the EGR system. if the transmission shifts OK, I would not worry about it.
Q. Why does my 73 model C6 modulator have two vacuum hoses?
A. 73 was the first year for EGR valves. It was found that when the EGR opened, intake vacuum dropped causing later shifts. Adding the inner vacuum line which comes from the EGR, helped rebalance the shift points. Normally the inner (smaller) vacuum hose can be plugged off and the port on the modulator left open with no ill effects.
Q. Why does my 73 model C6 modulator have two vacuum hoses?
A. 73 was the first year for EGR valves. It was found that when the EGR opened, intake vacuum dropped causing later shifts. Adding the inner vacuum line which comes from the EGR, helped rebalance the shift points. Normally the inner (smaller) vacuum hose can be plugged off and the port on the modulator left open with no ill effects.
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compaddict
1987 - 1996 F150 & Larger F-Series Trucks
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Jul 21, 2005 08:43 PM
