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Discussion Starter · #1 ·
After re-oiling my k&n drop-in today (it had about 12k miles on it) and doing a little bit of sanding to the upper section of the airbox, my dv has gone from silent to (relatively) bov-like, making noise when I come off-throttle in every gear except first. Is it normal for this much of a change to happen, or could I have under/over oiled the filter?
 

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Re: sudden dv noise... (1.8fla)

DV valve is common to lose vacuum and make noises as you described. It is covered under warranty being that your car is an 03.
 
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