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International Automotive Technicians Network
Re: Vacuum.Do we know what all it can do?
Posted to Technical Theory Forum on 6/16/2020

If you unplug one of the VANOS [VVT] solenoids, when you start it it should revert to throttle-body control. But you have disabled the VVT on one cam. And yes, the VVT is active at idle.

If you disable the Valvetronic [variable valve lift], it should revert ... Login to read more.