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johnman001 johnman001 is offline
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Join Date: Jan 2005
Location: Southern Indiana. formerly Kansas City, MO
Posts: 452
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Do they ever rattle at idle? Or is it only one time when vacuum goes high?


I replaced an engine that I could find nothing wrong with other than it did make some knocking noises when the throttle was blipped. I had thought it was a chain tensioner (which I replaced), and then concluded it was a rod knock and replaced the engine rather than rebuild (back when a running engine was cheaper than rebuilding). The engine still sits as it was removed. I am now thinking (15 years later) that my less than professional opinion could have been wrong. I am considering opening up the BOV/pop-off housing to see if the seals are indeed deteriorated. At some point, I will rebuild this engine and will find out definitively, if my original conclusions were correct (rod knock).

My current condition (in a different thread) is a distinct vacuum leak, but I haven't heard the current BOV with a leaking seal make any noises.

Now that I have read a bunch more on the stock BOV, it got my curiosity going. One of these days, I will have to take that engine apart, find out what the noise was and rebuild it.
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2016 981 Boxster S.................| 1983 911 Turbo - (White)
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1971 914 (TBD).....................|
Old 12-23-2014, 03:31 PM
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