Strange Noise on Start/Stop Activation

Matt6494

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Nov 19, 2015
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Hi Everyone,

Hoping you can help with a wierd noise my car is making. When the start/stop activates, and sometimes when I start the car when it is cold and it idles at about 1100rpm rather than 1000rpm it's makes an odd noise.

The best way I can describe it is that it sounds like a cow moo, or trapped gas, and lasts about 2 seconds on every start/stop or longer when idling at 1100 rpm. Anyone got any ideas?

Thanks