[codesx]

My car runs a bit rich, though not bad at WOT.
Every start up, black smoke emits.
I know I need to replace the injectors, which is happening soon.

That said, I see the black (fuel, based on smell) on every start, even if just off for 1 minute. (Watching someone else start it. It can't be seen in rear view mirror)

I still have stock exhaust.

Typical when modded?
Just ignore it?

Or uncommon and likely to clear after injector replacement?

Thanks for the thoughts!

[Rushan]

Never had a black smoke on startup, could be carbon build up? Any walnut blasting done? A friend bough a used e92 but it was buffing black smoke on flooring it I guess previous owner never floored it and used low grade fuel, an injector cleaner and few pulls cleared it all.

[THE BEAST]

Ummmm No.

[codesx]

Rubbish. I was hoping it was due to out tunes.
I do WOT many times a day and walnut blasting and liquid port cleaning done (ports visually look clean).

Will update after injector replacement.

[ifjd073]

I throw out an unfortunate amount of soot in a liquid suspension on startup, which I attribute to startup richness. It's enough to make a fun little spray pattern on my garage door if I ever test fire - note that after I saw it once I never leave my garage door down for any reason when starting. That said, it doesn't smoke... Just does that for a minute or so.

[THE BEAST]

Originally Posted by codesx

Rubbish. I was hoping it was due to out tunes.
I do WOT many times a day and walnut blasting and liquid port cleaning done (ports visually look clean).

Will update after injector replacement.

I would lean towards injectors as well.

[rickz96]

Originally Posted by ifjd073

I throw out an unfortunate amount of soot in a liquid suspension on startup, which I attribute to startup richness. It's enough to make a fun little spray pattern on my garage door if I ever test fire - note that after I saw it once I never leave my garage door down for any reason when starting. That said, it doesn't smoke... Just does that for a minute or so.

I second this...have the stains on my door as well.

[mrmax1984]

Could be oxygen sensors as well, if this is happening after the car warms up:

How I Diagnosed My Failed Oxygen (Air Fuel Ratio) Sensor - BMW DIY - YouTube

[funglenn]

i had a JB4 tune and no smoke, moved to COBB and no smoke at all.

[THE BEAST]

Originally Posted by funglenn

i had a JB4 tune and no smoke, moved to COBB and no smoke at all.

So what your saying is, your car never smoked.

[codesx]

Originally Posted by mrmax1984

Could be oxygen sensors as well, if this is happening after the car warms up:

How I Diagnosed My Failed Oxygen (Air Fuel Ratio) Sensor - BMW DIY - YouTube

Thanks. Very interesting video.

[codesx]

Originally Posted by funglenn

i had a JB4 tune and no smoke, moved to COBB and no smoke at all.

LOL. Who goes from JB4 to COBB?

P.S. You still have JB4 in your signature. I think I'm miss-reading a few things here