Big Head problems!!
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Big Head problems!!
Ive got a 2001 f350 with a 7.3L and i bought the truck with a banks bighead on it. recently its been acting up and not boosting the close to 20psi it normally does. its only boosting just over 10psi. i pressure tested the big head and it held the pressure i also tested the vacum lines and they seem to be fine. i tried to take it off to see if the valve was locked up on the other end but i cant get it too move. i was wondering if they seize up in a certain position and i was wondering what i have to do to fix it. any help would be great. i think i have to pull the turbo off to do the seals, so i think that i might have to fix the valve if its stuck. i was wondering if anyone has had this problem, and what did you do to fix it. any help would be great thanks.
Baret
Baret
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Joined: Sep 2006
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From: Millbrook Alabama
Baret, you do realize that those are pressure lines, and not vaccum lines (red a green). The reason you cant move the rod is because there is a 40# spring holding it in place.
there is a spring and a diaphragm inside the bell of the WGA. the force of the exhaust gasses push on the butterfly valve(W.G.) and try to pull the rod wich some times takes a 5psi puff of air from the red line to help it close.
I think you just have a boost leak somewhere, tighten all boots.
there is a spring and a diaphragm inside the bell of the WGA. the force of the exhaust gasses push on the butterfly valve(W.G.) and try to pull the rod wich some times takes a 5psi puff of air from the red line to help it close.
I think you just have a boost leak somewhere, tighten all boots.
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All Fixed
Thanks for your help i figured out what it was i guess where the mount for the bigheads pressure lines are, there's a rubber gasket that mates it to the turbo Y. it was extremely loose and must have messed up a vaccumn or something. i also tightened up all the clamps around the turbo but they were all pretty tight except for the intake where it meets the turbo. i put a K+N cold air intake in and that may have been loose, all i know is its now boosting around 20 psi like was before and its way more snappy. thanks again for your help.
-Baret
-Baret
