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post #28 of (permalink) Old 04-17-2017, 02:27 PM
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Join Date: Dec 2010
Location: SF, CA
Age: 38
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Another idea: You mentioned new EGR - did you mean the valve?
- Was the pipe gunked up as well?
- I only know this academically b/c I don't have this on my car anymore but I seem to recall that a closed EGR could cause knocking. A real professional mechanic like madmikey could confirm this theory.

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