General car discussion and other related topics of interest for MN 3/S members.
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1994 3000GT - the electronic buzzing noise changes with rpm. Even though the radio is off, I am sure it is coming from the front speakers. It reminds me of the sound of an old points type distributor without a condenser.
The condenser is mounted to the front of the ignition coil pack bracket. Take a look and see if the wiring has come apart or is damaged.