Close
Q:

what exactly is a purge valve for the audi? mechanic said car's running to rich on 1998 Audi A4 Quattro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
could be Mass Air Flow Sensor or need to have purge valve replaced
(1) Answer
Purge valve is a small motor unit that pulls gas vapors out of tank then is pushed into your intake. Makes vehicle more fuel efficient- it's used as part of your evaporative emissions system. I've never heard it making the car run more rich- usually uses more fuel and possibly chokes if not working. You should however get a trouble light on dash when your computer recognizes problems with that system. Mass air flow sensor makes more sense as to the problem though just the same you should be getting a trouble light for it.