991.1 Turbo S Rear Squeaking.

[PowerEnhancer]

Hi,  

I picked up a 2015 Turbo S from Porsche Glasgow in May and have an almost constant squeaking coming from the rear of the car that occurs with suspension movement. 

Sometimes I can get away with a mile or two at the start of a journey without any noise but when it starts it progressively worsens until every undulation creates noise, which is about every inch of road with the turbo s suspension.  The noise then remains continuous for the remainder of the journey regardless if it's 10 or 100 miles.

Noise here https://www.dropbox.com/s/cdx9imqnrglfmw8/Noise.mp...

Glasgow OPC collected the car in June but couldn't find any issue.  I suspect a couple of short journeys weren't enough to get the noise started.  Unfortunately,  they are no longer interested so I took it to my local dealer in Norwich. 

They took it out, acknowledged the noise, removed a few stones from the suspension arms and advised that there are no faults with the rear suspension parts.  No noise for a couple of days and then it returned with a vengeance. Contacted the Norwich dealer again and they advised that only faulty components are covered by the Porsche warranty.  Apparently, continuous, loud squeaking is acceptable. 

Any ideas? 

Thanks,

Andy

[arcamalpha]

Any difference based on spoiler height or suspension pasm mode?

[PowerEnhancer]

Neither makes any difference. I suspect the dealer having had the car on the ramp for a while unloaded the suspension enough that it stopped the noise for a couple of days.

The poor quality video taken from the front doesn't really show how loud it really is.

[IREvans]

PowerEnhancer said:

Hi,  

I picked up a 2015 Turbo S from Porsche Glasgow in May and have an almost constant squeaking coming from the rear of the car that occurs with suspension movement. 

Sometimes I can get away with a mile or two at the start of a journey without any noise but when it starts it progressively worsens until every undulation creates noise, which is about every inch of road with the turbo s suspension.  The noise then remains continuous for the remainder of the journey regardless if it's 10 or 100 miles.

Noise here https://www.dropbox.com/s/cdx9imqnrglfmw8/Noise.mp...

Glasgow OPC collected the car in June but couldn't find any issue.  I suspect a couple of short journeys weren't enough to get the noise started.  Unfortunately,  they are no longer interested so I took it to my local dealer in Norwich. 

They took it out, acknowledged the noise, removed a few stones from the suspension arms and advised that there are no faults with the rear suspension parts.  No noise for a couple of days and then it returned with a vengeance. Contacted the Norwich dealer again and they advised that only faulty components are covered by the Porsche warranty.  Apparently, continuous, loud squeaking is acceptable. 

Any ideas? 

Thanks,

Andy

A suspension squeak can be a nightmare to trace, and what makes it so hard to trace on a 911 is the number of bushes which transmit suspension movements. 991 rear corner has 8 bushes, plus the rear steer joints, and anti roll bar fixings.

If you want to be methodical, then you could spray some good quality silicone lubricant onto each bush one at a time, and then test drive to see which bush was at fault. The car is 7 years old, so it’s quite conceivable that one of the bushes is worn out.

Alternatively, just spray them all and be done with it..!

Hope you fix it

[PowerEnhancer]

Thanks. Hopefully, they are all accessible!

I had wondered if a faulty shock could cause this?

[legzr1]

I had similar with a 997T.

Quiet when cold, noise started once the rubber bushes warmed.

Sorted with a new pair of rear coffin arms.

[jh001]

I had a squeaking coming from the rear of a 991.1 GT3 I had, it turned out to be the rubber bump stops on the engine lid, lubed them with some silicone spray and all was good.

[IREvans]

PowerEnhancer said:

Thanks. Hopefully, they are all accessible!

I had wondered if a faulty shock could cause this?

Ideally get the car on a wheel free lift, and you should be able to access all the bushes. Alternatively do one corner at a time by taking a wheel off, but with centre locks this can be a pain.

Unlikely to be a faulty shock; as they’re fluid filled, the moving parts tend not to come into contact to generate a squeak. Although with the car in the air, check the condition of the damper body and rubber bump stop and top mount, and make sure everything looks ok

[JamesW]

I had the same issue for a few months, and in the end it did come down to a small stone wedged in between the coil and damper on the rear passenger side. It would stop for a couple of weeks, and then start again as it progressively wedged and un-wedged itself. In the end it was the head tech South London who found it - but only after coming out for a ride with me (it did take 2 visits over a few months to get it sorted though). The stone ended up door wedge shaped, where it was gradually wearing down.