Why does your car make a whistling noise when your foot is off the accelerator?
could be a vacum leak in the engines intake or just road noise from the tires you cant hear when you step on the gas.
What causes a whistling noise in a 1992 Honda Civic that goes away only when the clutch pedal is engaged?
Why would there be a whistling noise coming from the engine area when you press the accelerator on a 2003 Impala?
I had a similar problem on my 2002 Impala which turned out to be the air filter housing cover was not put back on correctly after changing the filter. You may also want to look at all the connections & fittings in the air hoses to make sure they are seated and tight. Mike my $.02 I have seen PVC valves incorrectly installed on these as well. Dealer parts required on this one at that…