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Thread: 289 stumble
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Old 11-02-2009, 10:27 PM   #35 (permalink)
kdillard21
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Join Date: Apr 2009
Posts: 48
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let me clarify this because i think we have found the problem...

A typical PCV valve for a normal car would probably expect to see about 20-22 inches of vacuum at idle, however, my cam is only expected to produce 12 inches at idle, which means that the spring in the valve would overcome the vaccum and open, creating a huge vacuum leak. That would also make a lean mixture in the intake and hard to idle cause a need for more advance. Now when i put it in gear, the load increases on the engine, vacuum drops even more, aggravating the situation and opening the PCV valve further, creating a larger vacuum leak and there is my problem.

That would make sense why it runs pretty good WOT because the valve would be open anyway to let the blowby back into the intake. That is what I get for buying the shiny universal PCV from summit.

What do you think?
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