[DML] Slightly rough hot idle, sulfur smell
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[DML] Slightly rough hot idle, sulfur smell

Hey all,

The last couple of years my D has had a slightly rough hot idle.  It's at around 900 rpm most of the time when hot, and it kind of wavers down to about 500, then surges to 1000, then back to 900 or so.... A couple years ago it was very smooth so I know what it can sound like.  The car starts easy cold, after a couple of cranks hot, and has plenty of power.  It's not missing.

I added a bottle of Techron to a pretty low fuel tank to shock clean the injectors in case they got dirty.  I know everything in the tank is good, and I have checked all the obvious stuff like vacuum lines.  

Anyway I can smell the exhaust at hot idle and it smells like extinguished matches - a little like sulfur.

Does that sound like a rich or lean condition?  


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