I drove my 85LTC out to a park enjoying some delightful Spring weather in Seattle today, everything running fine. On the way home I suddenly heard a semi-loud high frequency noise in the cabin. It quickly became apparent it was rising and falling exactly with the engine speed, but it sounded as if it were being made electronically.
I had heard something like it on an old Buick that had faint feedback through the radio. I turned off the radio to make sure it wasn't that, but the volume was just the same, seeming to come from the dash. After about 10 minutes I went over a bump and it stopped, then came back. During the 10 mile drive it sort of came and went according to bumps in the road, always following the pitch of the engine speed, sometimes rather loud, sometimes very faint.
My only guess is some kind of bad connection or feedback throught the attention chime of the electronic message center.
It is loud enough to be quite annoying; any help is appreciated.
I had heard something like it on an old Buick that had faint feedback through the radio. I turned off the radio to make sure it wasn't that, but the volume was just the same, seeming to come from the dash. After about 10 minutes I went over a bump and it stopped, then came back. During the 10 mile drive it sort of came and went according to bumps in the road, always following the pitch of the engine speed, sometimes rather loud, sometimes very faint.
My only guess is some kind of bad connection or feedback throught the attention chime of the electronic message center.
It is loud enough to be quite annoying; any help is appreciated.
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