Is this a vacuum issue?
Postmaster
Joined: May 2002
Posts: 3,241
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From: Broken Arrow, OK
That's because vacuum is more accurately a function of engine load. At idle most engines are in the vicinity of 20 in-Hg vacuum in the intake manifold. At roughly 10 in-Hg they are sending about half of the available power at whatever rpm they are at to the wheels. Most power accesories stop working at around 10 in-Hg, so if you're over 1/2 throttle nothing that uses vacuum will work. It takes several seconds for the vacuum in the system to bleed off and that's why you don't see the affects immediately.
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