# Ticking Sound Only When Accelerating **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercury, noises\ **Created:** [September 18, 2010, 11:13pm UTC](https://community.cartalk.com/t/ticking-sound-only-when-accelerating/55298 "2010-09-18T23:13:06Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [September 19, 2010, 3:13am UTC](https://community.cartalk.com/t/ticking-sound-only-when-accelerating/55298/5 "2010-09-19T03:13:34Z")
It does sound like spark knock…It could be a faulty detonation sensor or there is carbon buildup in the combustion chambers. Let the tank get down to 1/8, add a bottle of Techron and take it out and do several full-throttle accelerations up to as high a speed as you can manage. This should “decarbonize” the engine and eliminate the detonation… --- _[View the full topic](https://community.cartalk.com/t/ticking-sound-only-when-accelerating/55298)._