I've got an '08 E83 and I am at a loss for information on the vacuum operated flapper valve at the root end of the tailpipe. I have the now well-known E83 rough idle and I am wondering if that vacuum line is a source of a vacuum leak causing the rough idle. I am looking for the solenoid that controls it. I am assuming that it is controlled by a solenoid somewhere because I think it is operated by the engine controller. The other possibility is that it is operated directly by manifold vacuum. In that case where is it plugged into the manifold? I cannot find any information in my Bentley Manual or in the parts breakdown at:
https://www.realoem.com/bmw/enUS/select?vin=WJ09460 . Is there anybody out there that is acquainted with the location of the solenoid or have any information that can help me? Even information about when it is supposed to operate, actual vacuum source and is "vacuum on" open or closed? If I can find the solenoid I plan to plug the vacuum line there instead of at the muffler. I have crawled under the car an checked the flapper valve and it appears that the diaphragm is busted because pumping a vacuum directly on the valve just sucks air and the lever arm never moves. Today I picked up some vacuum plugs at the auto parts store and I am going to plug the line right where it plugs into the valve and see if the idle gets better. In the long run I want to plug the line right at the solenoid that controls it or unplug it if that is the vacuum off position but I cannot find it. Any help out there?
AceEngineer
05-22-2023, 10:02 AM
Looking for help with the exhaust flapper valve on an E83
I found it!
Linear Mode
