The Bird has become a rubber duck! quacking sound!!!!

[TheBird]

Hi all. Out of the blue the car has started making a "quacking" noise like a toy rubber duck that matches wheel speed at slow speeds. It's so comical! But I hate it... people are laughing at the car instead of the previous... Ooooooooohhhh, nice car sounds they'd make. The car is a 2000 Boxster 2.7.

The suspension is the M030 and was refreshed last year and has been quiet until a drive home from the pub on a bit of a lumpy road.

Since the sound follows wheel speed and I'd expect the bearing to make more of a grinding noise I am leaning towards the CV and/or CV boot on the driver's side. Has anyone else heard this comical yet frustrating noise?

[Cunningr]

Maybe your ride developed a personality disorder! .

Sorry, couldnt help myself, any specific side or corner wheresound eminates?

[MWS]

Try and identify which wheel is the culprit, then start with the simplest things. Look for anything that might be contacting the tire (plastic flap, etc) and check your tires. I once had a tire that made a "flap-flap" noise...it turned out a plastic label. Also try to free spin the tire and pinpoint from there. I always start with the simplest/dumbest things and work upwards.

[Jamesp]

Make sure the outboard rear axle nuts are fully torqued. I had a similar noise and replaced the rear bearings only for the noise to return. Turned out I only needed to tighten to axle bolts.