11/04/2026
Hear That Whistling? It Could Be Your PCV Valve!
That high pitched whistling noise coming from your engine could be a sign of a failing PCV valve.
Inside the PCV system is a rubber diaphragm that helps regulate engine crankcase pressure. When that diaphragm tears, engine vacuum can pull air through the opening at high speed, creating a noticeable whistling sound.
A small noise could be a sign of a bigger issue. If your vehicle starts making an unusual whistle, don't ignore it!
Contact Swedish Motors to schedule an inspection. We'll help get to the bottom of it!