![HHR 2.2 - 2.4 Ecotec Whining / Whistling Engine Noise Solved! Oil cap and Dipstick Sucking Air! PCV? - YouTube HHR 2.2 - 2.4 Ecotec Whining / Whistling Engine Noise Solved! Oil cap and Dipstick Sucking Air! PCV? - YouTube](https://i.ytimg.com/vi/4G5VTC17SIw/hqdefault.jpg)
HHR 2.2 - 2.4 Ecotec Whining / Whistling Engine Noise Solved! Oil cap and Dipstick Sucking Air! PCV? - YouTube
My car makes a faint whistling sound if I let off the accelerator at around 30kph. The sound slowly decreases in pitch as the car coasts. What could cause this? - Quora
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