Bimmerfest - BMW Forums - View Single Post - CCV Replacement on an M54 (E39)
View Single Post
Old 12-16-2009, 04:03 AM
Fudman's Avatar
Fudman Fudman is offline
Officially Welcomed to the 'Fest
Location: Sudbury, MA
Join Date: Apr 2007
Posts: 6,823
Mein Auto: '02 530i Sport auto
Originally Posted by masaled View Post
Nice DIY write up Fudman.

At what mileage should one expect the CCV to go out, or what symptoms should I look out for?

Infor. much appreciated

Mileage is anytime. it all depends on how many short trips (<5 miles) you do in cold weather with how many long trips (> 10 miles) in between. The cause of CCV failure is condensation of oil vapors in the CCV itself. See spydrz pix for details. Can happen anywhere but is worst in cold climates. As 16valvex, the design "fix" is cheesy and a stopgap measure at best. But it is better than the original design. The real solution is to avoid short trips in cold weather. Short trips cause the oil condensation, long trips burn it off. Symptoms of CCV failure or clogging are increased oil consumption, black smoke in exhaust (typically at startup), etc. Cracked CCV hoses can create all sorts of running and idling problems due to vacuum leaks. The worst case scenario is engine hydrolock but that is rare and is typically where it is REALLY cold.
Reply With Quote