2005 545 E60 Rough Idle - Increased emissions Fixed!
 

I have gotten great info on this site and want to contribute

This is what I did to my 5 series to make it purr like new.

replaced the air filter
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Cleaned the radiator cap inside and out and replaced tube over the radiator.
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Replaced both Crank Case Valves and removed the vacuum lines
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Replaced the spark plugs - iridium NGK
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Replaced Vacuum lines from intake that feeds Crank case valves
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