# Clanking sound from engine

**URL:** <https://community.cartalk.com/t/clanking-sound-from-engine/167>\
**Category:** Maintenance/Repairs\
**Created:** [June 2, 2007, 6:28pm UTC](https://community.cartalk.com/t/clanking-sound-from-engine/167 "2007-06-02T18:28:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![neu9109](https://avatars.discourse-cdn.com/v4/letter/n/e47774/32.png) [@neu9109](https://community.cartalk.com/u/neu9109)\
**Post date:** [June 2, 2007, 6:28pm UTC](https://community.cartalk.com/t/clanking-sound-from-engine/167/1 "2007-06-02T18:28:39Z")

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I have a 2001 black Camaro Z28 (automatic) that I don’t drive very much (42,000 miles) and it’s in pretty good shape. I have no problems driving it when it’s cold, but as far back as I can remember when its warm (after driving for about 30 minutes) the car seems to have 1/2 its power when going from 30 to 40 mph. When I floor the accelerator at this point, I hear a loud “clanking” from the engine. After passing 45 mph, it seems fine. Any ideas what’s going on?

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**Author:** ![me\_art12](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@me\_art12](https://community.cartalk.com/u/me_art12)\
**Post date:** [June 3, 2007, 5:43pm UTC](https://community.cartalk.com/t/clanking-sound-from-engine/167/2 "2007-06-03T17:43:58Z")

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The “clanking” may be engine knock (ping). It might be fuel octane too low, carbon build up in the cylinders, timing too high (advanced).