31st December 2009, 01:59
M5 Expert (>4000)
Join Date: Jan 2007
Location: Franklin, MA
2002 Chiaretto Red M5
Thanked 2,334 Times in 935 Posts
Originally Posted by cmc540
Hello all. I have a 2001 540 and purchased a Peake R5/FCX-3 primarily so I could benefit from the wealth of knowledge on this board. The reader and the members on this board have helped me diagnose and correct several problems without having to visit the dealer. However, I'm now getting a couple of codes that I would greatly appreciate some help with. The codes I'm getting are:
1D - Mixture control, idle - Cyl 5-8
1C - Mixture control, idle - Cyl 1-4
62 - Evaporative emission system purge valve
The car does idle rough briefly at cold start. This has only become noticeable the last few days when the temps dropped below 45 degrees. Otherwise, the car runs great with no indications that anything is amiss except the CEL. I'm not seeing any obvious signs of a vacuum leak, so any ideas would be welcome before I just start replacing parts.
I'm not sure what the mixture control codes are telling me.
On the other problem, would the "purge valve" issue be related to the emission control air pump value (11721707619), the cover on the back of the intake manifold (11617501563) or the oil separator (11151705272)? None of these are referred to as "purge" valve on Realoem.com but I was hoping someone here could provide some info.
Mixture control codes are pretty much useless. It means either you have too much or too little or either air or fuel. Reset them and wait for a real code to arise.
The evap code means you need a new PCV valve. It is a pain to get to, so I would again reset and see if it recurs. I've had it 2x in my car, but it is very intermittent and I have no intention of replacing until it is continuous or I fail emissions.