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Thread: Negative crankcase pressure

  1. #11
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    Random guess: Bad intake valve stem seal(s). Though that might not cause a strong constant vacuum.
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  2. #12
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    Quote Originally Posted by J Wikoff View Post
    Random guess: Bad intake valve stem seal(s). Though that might not cause a strong constant vacuum.
    That is an interesting concept. This was an issue that happened in a days time. On Thursday it was fine.On Friday the hissing began. Could this happen that rapidly? I would guess that a bleed by test would be a way to check??
    Thanks for your reply. I will see what I can find out.
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