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Message: <blockquote data-quote="Iceduke" data-source="post: 609341" data-attributes="member: 3721">congrats on ur new ride...on the shuddering issue for cold starts...its apparently normal as the secondary air pump injects additional air to warm up the cat converter quickly (as told by one beemer specialist). For certain models (esp imported ones) the cars come with secondary air pump, some big round thingy next to the washer fluid container. Why CBU models mostly have it coz of ECE requirements by the authorities. You should hear a small turbine like sound when it pumps air in, should stop after about a minute or so... hope this helps <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>