# Mystery Sound on Mazda6i at 2500-3000rpm only when engine warm

**URL:** <https://community.cartalk.com/t/mystery-sound-on-mazda6i-at-2500-3000rpm-only-when-engine-warm/79923>\
**Category:** Maintenance/Repairs\
**Tags:** noises, rpm, mazda6, mazda\
**Created:** [June 18, 2013, 6:27pm UTC](https://community.cartalk.com/t/mystery-sound-on-mazda6i-at-2500-3000rpm-only-when-engine-warm/79923 "2013-06-18T18:27:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ticket2ride](https://avatars.discourse-cdn.com/v4/letter/t/5f9b8f/32.png) [@Ticket2ride](https://community.cartalk.com/u/Ticket2ride)\
**Post date:** [June 18, 2013, 6:27pm UTC](https://community.cartalk.com/t/mystery-sound-on-mazda6i-at-2500-3000rpm-only-when-engine-warm/79923/1 "2013-06-18T18:27:44Z")

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Hi all, my 05 Mazda6 (147000 miles) makes a roaring sound when accelerating and hitting 2500-3000 rpm. It only does it after being driven fast (interstate) for about 20 min, so when the engine is warm. Interestingly, the sound disappears once I get off the interstate and have stopped at maybe two traffic lights. After the stops, it runs excellent again, as it does in city traffic/commute where I don’t drive faster than 50mph for an extended period of time. Even with the roaring, there is no loss of power. Recent services: transmission service, full tune up. My mechanic said he didn’t hear anything and the car looks excellent (probably didn’t drive long/fast enough)Any suggestions?