987 rattling noise from the back

[vahe]

Hi,
My manual 987 produces some rattling when the car is warm and on 1-3 gears about 1500-2000 rpm slow acceleration. Interesting enough this mainly happens downhill, not so often flat or uphill.
Had a technician check the car, they did not find anything loose.
Any ideas what could this be? It’s not super frequent but really annoys me.

[Heaveho]

Hi, long shot, but on mine, although there wasn't any rattling noise in the car, I found that one of the heatshield bolts had pulled through in the very top corner of the rear wheelarch. Passenger side on mine. I couldn't hear anything in the car, and discovered it by accident when the wheels were off for a refurb, but I was cleaning everything up and it was loose and rattly when I was working around it. I managed to get the nut off and used a washer under it to secure the shield.

Cheap fix if it's just that. Lie under the car and give the shields a smack with your hand, it should be obvious if it's that.

[stewieyan]

Fixed.

For those who came across this problem which is quite common according to my mechanic:

The wrapper layer around the exhaust pipe can become a bit loose resulting in random rattling sounds. My mechanic used a clip to affix it and the sound is gone. Cheap and effective.