Question about Audi A3
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Posted on Jan 02, 2017
SOURCE: rising and falling idle
Hey, first i would check all of your vacuum hoses. Over time they can crack and leak and that can create the problem, then the computer compensates to correct it. The throttle position sensor could also be a possibility and in combination with a vac leak, can create a wide variety of symptoms that are difficult to separate and trace down. Get a can of carb cleaner with the little spray straw, start the engine and let it idle to warm up. Spray a little on each vac connector, around the base of each injector or the throttle body, and see if the rpms run up. If so, you may have found a leak that needs tightening down. Vacuum hoses can sometimes just have the split end cut off and reconnected. The hard plastic spaghetti lines may be so brittle they need to be completely replaced. Manifold and throttle body bolts can be tightened up, but occasionally the gasket may need replacing. I would start with that and see what it does for you. Let me know if I can be of any more assistance.
Posted on Dec 08, 2008
Check your EGR valve. EGR valve should be close when idling, if it opens, idling speed will drop. A defective EGR valve or the computer that controls the emmision may be the cause of your problem.
Posted on Apr 27, 2009
Fast idle control valve inside the throttle body. They get loose and back out causing a loping idle... If you are doing the repair, just tighten it back in and it will stop.
Posted on Sep 27, 2009
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