whistle under hood when cold
#1
#4
different air density,
what actually causes the whistle is the angle of the butterfly valve in the TB, cooler air is less dense so the whistle becomes much more apparent.
your engine might also be trying to pull more air in because of the lower density
i know my air compressors actually work harder when its cold out because it takes more air than in the summer to get the pressure up
what actually causes the whistle is the angle of the butterfly valve in the TB, cooler air is less dense so the whistle becomes much more apparent.
your engine might also be trying to pull more air in because of the lower density
i know my air compressors actually work harder when its cold out because it takes more air than in the summer to get the pressure up
#5