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I've been experiencing a crunching sound under certain conditions for a few years now and I'm trying to get to the bottom of it. It's a 2014 Subaru BRZ

  • Crunch only happens when car is rolling
  • Happens in any gear or neutral, clutch up or down
  • Only happens at the start of acceleration
  • High pitched crunching sound that happens only for an instant
  • Sounds like metal hitting metal

Some forums have suggested that it might be the firewall, headers or a misfire (which I doubt) and I'm going to investigate these when I have the chance. Any other suggestions are very much welcome!

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  • Welcome to Motor Vehicle Maintenance & Repair! May 19, 2023 at 16:11

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