My GF has an 07' Audi A4 2t, which only has 67k MI. on it. It recently started whining and my mechanic said there was a vacuum leak so he put a PCV valve on it so it's not AS whiny, the intake tube collapses when u Rev it high and when it idles there is a thumping sound that sound like the...
My intake tube collapses instead of expanding when I Rev the engine high. My mechanic works in a European car shop and never seen that before. Any suggestions? I JUST put a new PCV valve on and noticed it
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