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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > BMW Coding > Adjust idle RPM



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      11-13-2018, 10:31 AM   #23
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Quote:
Originally Posted by nsjames View Post
no, it's telling you exactly what you already know, that the motor runs roughly at idle, which is why you wanted to raise the idle, which happened coincidentally to doing the valve cover, which involves removing a bunch of vacuum lines, that are probably now leaking and causing your rough idle.

Does that adequately surmise your situation?

The root cause of all of this is something that happened when the valve cover was serviced. Your car most likely has a vacuum leak.

Everything that you've seen, felt or heard since that point is likely related to the exact same issue. There is no software or coding solution. Your car has a mechanical issue.
I ran smoothness test again, car seat was vibrating, but this time INPA did not show anything wrong:



a bit worse when mixture adjustment off:



So that's why mechanics cant find the issue, they see that everything is ok, but car seat is vibrating...
Still I will try to bring it tomorrow to mechanic and ask for air leak check.
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      11-13-2018, 02:38 PM   #24
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any mechanic that solely relies on the diagnostic software is a poor mechanic, likewise any mechanic that can't use the diagnostic software is a poor mechanic.

A good mechanic knows that the diagnostic software is simply reporting symptoms, and uses that information to find the mechanical issue that causes them.
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      11-15-2018, 05:07 PM   #25
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So mechnic inspected valve cover and hoses but did not find anything wrong or cracked, sensors show good data no bad signs... so basicaly just sapent money for nothing... not sure do I want to bring it somewhere else again and hear the same...
Can I test if its air system fault by disconecting MAF? If it stops vibrating then its vacuum leak?
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