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Strange Whistle on Cold Start Strange Whistle on Cold Start
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Old 12-04-2023, 03:10 PM
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Join Date: Jun 2021
Location: Austin, TX
Posts: 2,182
X5chemist will become famous soon enough
It's likely the secondary air injection pump. Mine whistled at cold start up too. Eventually, it threw a code for it too. Tried three different air pumps. Finally, a third pump turned off the code. I'll have to look up the brand. It was RockAuto most expensive air pump.
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