High pitched whining noise at 30 mph and above - 986 Forum - The Community for Porsche Boxster & Cayman Owners

DLow · 03-02-2011, 11:03 AM

The HVAC system is turned off. I am beginning to wonder if it is a pulley making the noise.

It might be time to take it to the shop.

Dale_K · 03-03-2011, 04:24 AM

I have a new fuel vent valve unit on order for a single tone "wooooo" sound that comes from the right front of the car under light load. The sound goes away instantly if I change the gas pedal position. My car also has issues when I fill the tank. Sometimes I can only get it 3/4 full.

To the OP, you might want to remove your oil fill cap with the motor running. If you can't get it off or find excessive vacuum your AOS would probably be the culprit. I've read elsewhere that this can create a screeching sound if air gets sucked past the RMS. Probably not the problem in your case but it's worth checking since it's so easy.

WhipE350 · 03-03-2011, 01:23 PM

[QUOTE=Dale_K]I have a new fuel vent valve unit on order for a single tone "wooooo" sound that comes from the right front of the car under light load. The sound goes away instantly if I change the gas pedal position. My car also has issues when I fill the tank. Sometimes I can only get it 3/4 full.
QUOTE]

Exactly how it is for me, not clear if DLow is having same issue. I'm trying to get same parts you are but from a parts car down the street.

Please report back and let us know if it works. Also I have part numbers but can you post again what part you are getting, thanks.

silverboxter · 03-04-2011, 06:06 PM

My wife's 2002 S (30K miles) had the same issue. The whine would disappear under 25 mph. Putting the car in neutral and revving the engine would not change anything. Applying the brakes while driving would not change the whine either. I was convinced that it might be a wheel bearing. Just before I took it to the shop the whine went away. It's been 4k miles and not a peep. Still concerned, tho.

saqib986 · 10-20-2011, 12:58 PM

I have an 03’ Boxster with 105k. I have been hearing this mysterious, high pitch, whistling noise from the passenger side for over a year. It comes once I hit over 30mph, and it completely disappears under 20mph. Coincidently, it started after I had the rear tires replaced and front alignment done. It echoes next to curb or another car. Sound does not vary with speed.

I finally couldn’t stand it any longer and took it to the shop earlier today. I will post an update once, if, they figure out what it is.