My car is a 1984 RX7 GS model with original 12A rotary engine and carburetor – no modifications. The noise I describe is not due to any recent work or changes to the car.

A high pitched squeal is emitted when the car is first started. The noise seems to come from behind the dashboard.

The noise gets a quieter after driving for 20 minutes or more, but there is still a buzzing sound that spoils the driving experience and never completely goes away. Even after driving for one hour the sound can return again.

If I disconnect one particular fuse, the noise stops completely, but my mechanic told me that this fuse is needed for the engine oil pressure. I am not sure that this is true.

I do not know enough about whatever else is on the same fuse and whether I will cause damage if I disconnent the fuse.

What can I do to make this insane noise go away ?

Another posting spoke of a morse code like sound - and that might be an accurate description in this case too.

Hoping for a “cure”,
-Lee

 

Check the oil and coolant level.

If those check out, test the oil level and coolant level sensors.

The coolant level wire needs to see a constant ground from the sensor to keep the buzz quiet. The oil level wire is the opposite.