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Just wondering if anyone has experienced a light dull knocking noise from their front end at low / manouvering type speeds.

The car has recently been at the dealers for a different fault... but on the complimentary health check they spotted that the n/s/f shock absorber bump stop is broken, would this cause the noise? They didn't give me a price for this... wondered if its something i can do myself?

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Hi Cartel,

I am trying to solve my issue on the front suspension for 2 years

Everything on my car is new changed under guaranty, and I mean everything( at the exception of the differential and the cardan) and it still rattles at low speed, I might have a gremlin hiding somewhere...

What Porsche mechanics always advised to change first when you have rattle are the sway bar links and the sway bar bushings, it is inexpensive and solves most of issues, but you can first try to re torque those sway bar links, the torque is 65 NM if it solve the issue I would advise to buy the new bolts ( the long ones) and glue them with loctite blue thread lock, first torque at 50 NM unlock 90° and retorque at 65NM

Then you can have the suspension domes ( silent block on top of the strut), see if yours are torqued correctly ( 3 bolts ) 33NM, they also age quickly

Then you have the control arms, my coffin control arms were shot at 115 000 KM and were making an old door noise, but the rattle did not come from them, trailing arms are also very robust on the 997 and I changed them with no effect

Struts are to be changed when they don't do their job anymore, no need to get in there unless you really feel that they are shot

Steering elements are useless to even consider, I have all elements changed at 125 000KM and they were like new ( include rack)

Proceed with method otherwise you will be spending a lot of money for nothing, those cars are more robust that certain forums are saying

Best way to identify rattle is to have headset with a microphone and try part by part, that's what my porsche center is doing next

Good luck and tell us what you find

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  • 4 months later...

Another less obvious check is the locking wheel nut.

I found the majority of knocking came from it being located in the centre of the towing eye in the polystyrene tool kit.

I still get knocking when its cold but it's massively reduced since putting the locking wheel nut in it's own place holder.

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