Whats an ACV, what does it do and do you need it, cuz iv seen people remove it and wondered why.
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Acv???
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ACV-air control valve. This is on the lower intake manifold, and the air pump feeds air into it. The ACV controls where the air pump's air goes - into the main cat, into the exhaust manifold, or into the silencer that's under the passenger side headlight. The '89-91 NA's have their 6-ports and VDI actuated from air pump pressure, so the ACV is required unless you fab something up. Oh yeah on a S4 fc it is not needed. but if you remove it you can also take the air pump out but you'll also need a duel belt pulley for your alternator so that your water pump functions correctly.Last edited by theflatlander; 04-28-2004, 11:52 AM.
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