I have a 1996 Trooper with 112k miles. When driving at highway speeds, say
40+ mph, there is a distinct buzz that comes from the dash where it meets
the windshield (at least to my ears while driving). Most of the time it will
stop if I let off the throttle, but sometimes it will carry on even after I
It is a very odd medium-frequency, plastic-metallic sound if that makes any
sense. The frequency stays constant once it starts, that is, it doesn't get
faster/louder as RPMs increase or decrease. It just carries on until I get
down to street speeds or ease off the throttle.
Has anyone else experienced this? Could it be something loose at the
firewall? Maybe the throttle cable isn't all the way secure and is banging
against something? Overall driveability and performance don't seem to be
affected and the truck runs like a top otherwise.