help with my friend's BOV
#26
Vacuum is high at idle and our cars produce really high vacuum for a four cylinder apparently. If you put to weak of spring in it. The high vacuum will PULL the valve open by over powering the spring. Just like it would when you let off the gas while in boost. The boost doesn't open the valve, the boost helps hold it closed. Its the vacuum from closing the throttlebody that opens it up.
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StratoBlue1109
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09-30-2018 01:09 PM