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Sounds like you are describing a PCV valve (a part of the crankcase
ventillation system). In some applications they may provide a convenient vacuum tap-off for another accessory, but probably not in your case. The vacuum diagram label inside your engine compartment should show that very clearly. Most likely someone just installed a 'universal' PCV valve, with an extra port and did a poor job of capping it. Unmetered air ('vacuum leak') sucked through there may cause unstable idling, explaining your fluctuating voltage. Things might have gotten a lot more 'interesting' if something was flapping around instead of just allowing a steady leak. Did you notice the MIL (check engine light) turning on? The computer should have detected this condition. > The gauge instantly resumed normal operation when I unblocked the port. > (Blocked with green electrical tape mostly sucked inside the port-clearly > no professional install) |
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