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Message: <blockquote data-quote="Wayne" data-source="post: 349767" data-attributes="member: 9652"><p>the sensor is a variable resistor so the computer can tell just how far open the valve is or if it is closed "it is not a switch." "this is the reason a fixed resistance still gives you a code light." I had problems with mine not shutting all the way too and I took it off put a hand vacuum pump on it and opened the valve then I took a pin knife and scratched the carbon build up off the top of the stem of the valve. you have work all the way around the stem working through the slots under the diaphragm just scratch off the carbon but try not o scratch the shaft to much this is were the exhaust is sealed off when the valve is open and seal prevents vacuum leak when its closed. if it has a carbon build up it will not let the valve close completely and the sensor sees this and you also get exhaust into the intake air stream at Idle which leans it out and causes a rough Idle. hope this helps. :thumb:</p></blockquote><p></p>