CheresX Posted September 3 Share Posted September 3 Upon starting my Mini Cooper S 2005, the engine revs to around 3000 rpm before quickly stabilizing to its regular idle speed. Typically, the value hovers around 800, however sometimes it may exceed this threshold. Do you have any hypotheses on the potential causes of this situation? I have conducted an inspection to identify any potential vacuum or air leaks, but I have been unable to locate any. Thank you in advance Quote Link to comment Share on other sites More sharing options...
guyskin Posted September 3 Share Posted September 3 Is there a significant consumption of oil? In the event of valve stem oil seal leakage or a malfunctioning PCV system, there is a possibility of additional fuel entering the cylinders before to combustion. Quote Link to comment Share on other sites More sharing options...
CheresX Posted September 3 Author Share Posted September 3 Understood, I haven't driven it much to see whether it consumes oil. It serves as my track car project and not my primary means of transportation. There is no smoke emitted throughout the starting process. Quote Link to comment Share on other sites More sharing options...
CheresX Posted September 3 Author Share Posted September 3 If I start it again promptly after halting, it will also do the action at that time. Quote Link to comment Share on other sites More sharing options...
guyskin Posted September 3 Share Posted September 3 Are you able to retrieve any codes whatsoever? Perhaps it will provide us with a hint - if not, we will need a high-quality scanner to examine real-time data. Quote Link to comment Share on other sites More sharing options...
CheresX Posted September 3 Author Share Posted September 3 There is a significant exhaust leak, and I am considering replacing it in the near future. Could this be the source of the problem? Quote Link to comment Share on other sites More sharing options...
CheresX Posted September 3 Author Share Posted September 3 I own an OBD11 device. I will inspect it tomorrow. I do not believe there was any present when I previously examined it, but I will do another thorough examination. Quote Link to comment Share on other sites More sharing options...
guyskin Posted September 3 Share Posted September 3 You may need a more advanced scanner capable of retrieving BMW-specific codes in addition to OBD2 generic codes. Check whether it detects any issues. Quote Link to comment Share on other sites More sharing options...
guyskin Posted September 3 Share Posted September 3 If the location of the issue is in close proximity to the front, namely the flexi hose component, it will deceive the downstream O2 sensor due to an air leak, causing significant disruption to the fuelling process. If that is really the situation, I would promptly address and resolve it. Quote Link to comment Share on other sites More sharing options...
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