# 2006 Sentra, subtle knock and rough idle **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [May 31, 2019, 1:16pm UTC](https://community.cartalk.com/t/2006-sentra-subtle-knock-and-rough-idle/141359 "2019-05-31T13:16:05Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Noelm](https://avatars.discourse-cdn.com/v4/letter/n/9fc348/32.png) [@Noelm](https://community.cartalk.com/u/Noelm)\ **Post date:** [May 31, 2019, 1:16pm UTC](https://community.cartalk.com/t/2006-sentra-subtle-knock-and-rough-idle/141359/1 "2019-05-31T13:16:05Z")
2006 Sentra, little over 110K on odometer. Changed oil 2 weeks ago and since then I have been noticing a subtle knock and idle is rough. The knock is particular when moving from a complete stop. I don’t think changing oil has anything to do with it, just a coincidence. No engine light. No particular event during these 2 weeks (like hitting a curb or something). Is there anything I can check? Can’t take it to the mechanic for the next 3 weeks (He is traveling). ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [May 31, 2019, 5:27pm UTC](https://community.cartalk.com/t/2006-sentra-subtle-knock-and-rough-idle/141359/2 "2019-05-31T17:27:54Z")
You might try a fuel system cleaner. It may not help but ??