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Old 12-03-2010, 03:06 PM
Swat17 Swat17 is offline
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Location: Fairview, OR
Join Date: Oct 2010
Posts: 17
Mein Auto: 2001 BMW 530i
Originally Posted by poolman View Post
After looking at this again you stated that you replaced the Vanos seals--I think you have an air leak and it's coming from the CCV valve and one or more of the 4 hose's that hook up to it--probably was aggravated
and made worse when you changed out the valve cover and again when you replaced the Vanos seals--also when replacing the valve cover--did you purchase the 15 rubber bolt grommets that are needed to do that job correctly?
i have checked my ccv hoses and found the hose with the red arrow extremely pinched. it was not cracked. i replaced that hose and the one that goes from the valve cover too just incase. now when the cars rpm gets low i hear a loud knock in the engine. when i rev up the engine, after a few seconds the rpm's start dropping by themselves, and then it knocks again. before replacing my vaccum hoses the car still made the knocking noise, but now it worse.
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