Quote:
Originally Posted by tdangle
Wonder, would eliminating the PCV valve also increase idle vacuum?
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Well... it depends...
The PCV valve is supposed to restrict air flow under high vacuum ( idle ) conditions down to something small enough not to affect idle quality. That is, the controlled vacuum leak that is the PCV system is supposed to go away at idle.
If the PCV valve you have currently isn't doing that, then you have too large a vacuum "leak" at idle as a result, which will cause the things that vacuum leaks cause!
Easy enough to check. Before I recently replaced my non-functioning-properly PCV valve, plugging the vacuum line to it caused idle to clean up very nicely ( just as if a vacuum leak had been plugged ) and likely did increase overall Hg as well!
-klb