Same thing here. I think BMW's bulkhead design is subpar and the HVAC unit sucks. The pollution sensor IMO is useless.
The valve cover gasket material is polyacrylate. I do not think it ever changed. ACM is cheaper than FKM and possibly even HNBR. The valve cover design itself with the ultrasonically welded CCV panel I think is the problem.
I would be willing to go to an aluminum cover the next time if a reliable one is available. Some aftermarket ones use a flat gasket, so the OE one would not fit. I am not sure that is a good solution, in case the non-standard gasket needs replacement.
Quote:
Originally Posted by The Nightman
2009 E90 N52 w/ 140k km
I thought the hood seal, air quality sensor and cabin filter would be more useful. The foul smell is still noticeable even with the recirculation flaps closed!
|