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Anyone else with excessive carbon on exhaust tips?

5K views 16 replies 13 participants last post by  UncleJ 
#1 ·
On our F25 I spent 30 minutes and two types of metal/chrome polish trying to remove the baked on black carbon on the end of the exhaust tips. It would not come off. I have never experienced this problem on any of our other 3 BMW's.

Is there something about the twin tubo 4 banger? Does it run rich? I suspect an issue of some sort but do not have a CEL. Will have to take in for the shop to scan for codes I think just to be safe.

Anyone else notice this issue?
 

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#3 ·
Yes but

Yes, but it is also an engine and it isn't supposed to blow that crap out the poppintubbin. Gonna have the dealer pull the plugs and have a look see at their condition. Something is amiss, it should not be running this rich and didn't earlier on this year after we first got it.
 
#8 ·
The service manager here says this is normal, but couldn't explain why. I only see it on the right exhaust of my 2013 F25, and it wipes off very easily with a WD-40-soaked paper towel. Odd.
 
#13 ·
excessive carbon/soot in & on exhaust tip(s)

have had our new X3 for a month now and havwe cleaned it up a few times already. been using Nevr Dull which is fine for inside the pipe but doesn't work as well on the chrome tip where it's obvioulsy baked on there - takes some elbow grease but it eventually comes off. could this build-up be the result of the Start/Stop function (frequent starts) or the Eco Pro mode that the wife drives with constantly? i'm with ya on this....never had this problem on my old E83 X3.
 
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