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Discussion Starter · #1 ·
Has anyone experienced what sounds like heat shield resonance for thirty seconds or so after cold starting a Cayman 981?

A slight touch of the accelerator to increase the RPM causes the noise to go away, but when pressure is removed from the accelerator and the RPMs drop back to a fast cold-idle, the noise returns. However, as soon as the car warms, approximately 30 seconds, and the idle drops to “normal” the noise goes away completely and does not recur even if RPMs are increased.

Notably, after sitting for several hours, there is no resonance after starting the car. I only notice the noise when starting the car after it has sat overnight.

I’m only guessing that it’s heat shield resonance, because that’s what it sounds like. So any ideas on what it could be are appreciated.


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