I have a 2015 All 4 and notice that after driving my garage has a "blow-by" smell. Is this normal or is it a sign of impending doom?

 

What do you mean by "blow by"? Does it smell like oil?

Any codes, engine lights showing?

 

No codes, runs fine just not accustomed to "crankcase smell" in the garage. It does dissipate.

 

38,000 miles, NM intake, NM power module, Turbosmart 50/50 BOV, Forge tubing where available and Borla exhaust

 

Your 50/50 BOV is most likely creating the smell. It's venting crank case gases into the atmosphere instead of all back into the turbo inlet. I would 100% recirculate, or put the stock piece back on the test out.

Plus, the MAF doesn't like any air being vented to the atmosphere, not how our engines are designed.

 

Thank you for your responses.

 

You're welcome. I hope that the fix is that simple and you get back to having fun in your CM!