I know there are more than one vacuum switching valve on our trucks.
Are you talking about the VSV for the vapor pressure sensor on the charcoal canister?
Yup the solonoid of the vsv valve by the charcoal canister, opening and closing regulating the vacuum to the intake manifold is what the noise is. In other models this valve is covered or in a spot to reduce the sound.
V6 making new noises, ticking and shrieking sometimes
Quote:
Originally Posted by spartacus
Yup the solonoid of the vsv valve by the charcoal canister, opening and closing regulating the vacuum to the intake manifold is what the noise is. In other models this valve is covered or in a spot to reduce the sound.
So mine only ticks once the engine is warm. Something to do with open vs closed loop?