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Originally Posted by fast4d
this is bad advice. how is this going to going to alleviate anything?
to the OP. does the 'knocking' only happen when you're accelerating or going uphill?
either you got a really bad tank of gas or there's oil in your intake. ingesting oil will promote dentonation. check the oil seperator.
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the knocking is pretty much all time. it's a chugging type of knocking. even when sitting idle. i can hear it. cluck cluck cluck cluck.
2001 4.4 x5 with only 51k miles on it. mostly city.
i got the stp gas treatment, going to use that on my next fill up. i suspect bad gas, who knows. then i had a sludge post too...
http://www.xoutpost.com/x5-e53-forum/...e-remover.html