1989 525I m-20.should the engine have an increased idle speed and then decelerate on the first start of the day?mine simply starts and idles at 750 rpm.i do live in the high desert and its summer so the coolant temp probably dosent drop below 70 degrees faranheight even after sitting all night.also the valve does hum and vibrate slightly in position #2 ignition.when you pull the electrical connector off there is no increase in idle speed. any advice? thanks bones