Originally Posted by 94'325is
Yeah a vacuum leak would cause it to run rich if anything. What are your AFR's in boost? Are the injectors newly installed or do you smell fuel anywhere in the engine bay?
Vacuum leaks will make the car run lean. Any air that is not going through the MAF that is introduced into the combustion chambers is unmetered air. The proper amount of fuel will not be delivered due to this misreading.