Ask the expert
Got a question for our Porsche technician? Email us email@example.com
I’m the owner of a 2002 996 Cabriolet with 95,000km on the clock. I bought it in Berlin in July 2008 and brought it back to Portugal. I’m very happy with the car.
The reason for my contact is because when I run over bad surfaces, I notice a noise at the very rear of the car. A strong ‘clanking’ sound; it seems something like steel against steel.
I have taken the car to my local
Porsche centre, Centro Porsche Porto, to investigate, but no mechanical problems arose. The brakes, suspension, struts and nuts are all ok – they even checked rear brakes, mufflers, arms… Porsche said it could be some water pipes or tubes which are passing very near the body to make that strange noise.
I understand that you cannot make a diagnosis over email, but I wonder if you have any further comments to add which may help me. I’d love to be able to solve the problem of this irritable noise. I have a fear that something might have broken, and if we drive on a highway at high speeds it could be dangerous.
Scott’s answer: This is very interesting. If you are experiencing a metal-on-metal rubbing noise only on rough surfaces or bumps it could be a number of things. I have seen a lot of issues with brake discs’ backing plates rubbing against the brake discs intermittently, for example.
Alternatively, if the noise is more of a clonk or hollow knocking noise I would be inclined to look at the rear trailing arm bushes, perhaps remove them and check for play, which again is a common issue.
Lastly, I have seen a few issues of golf ball-sized stones that have flicked up and sit on top of the lower arms that again intermittently can cause clonking noises. Regardless, further investigation is clearly needed to solve the issue.
Scott Gardner Job Title Gold Diagnostic Technician Place of work Porsche Centre Bournemouth, UK Time at Porsche 12 years