I've got a noise that seems to be engine speed and load dependant. Under partial throttle acceleration @ 22-2300 rpm I hear a noise from under the hood that sounds like a plastic coach's whistle (little ball bouncing inside the case) but somewhat muted. The noise is more of a plastic clacking rather than a shrill whistle. The noise also seems to be temperature dependant, more likely above 80C on the water temp. The noise diminishes as rpm increases but is still there @3200 rpm and
74 mph. As the the car shifts through the gears, the noise comes and goes as the rpm increase and then drops below 2300. I can give it full throttle and the noise isn't apparent, and I can release throttle at cruise and also make it disappear. At times when the engine is cold and warming up on the highway at 65-70 mph the noise starts while under a constant load as the water temp climbs >80. Any ideas?Thanks!
Roy