# 2009 Ford Crown Victoria - Knocks

**URL:** <https://community.cartalk.com/t/2009-ford-crown-victoria-knocks/134410>\
**Category:** Maintenance/Repairs\
**Tags:** ford\
**Created:** [February 11, 2019, 2:54pm UTC](https://community.cartalk.com/t/2009-ford-crown-victoria-knocks/134410 "2019-02-11T14:54:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TalonDouglas](https://avatars.discourse-cdn.com/v4/letter/t/bb73d2/32.png) [@TalonDouglas](https://community.cartalk.com/u/TalonDouglas)\
**Post date:** [February 11, 2019, 2:54pm UTC](https://community.cartalk.com/t/2009-ford-crown-victoria-knocks/134410/1 "2019-02-11T14:54:36Z")

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I recently bought a 2009 Ford Crown Vic. After about a week, I decided to accelerate a bit quickly and immediately, the engine began knocking. It seems to be coming from the back of the engine bay, maybe somewhere in the middle. I’ve heard a variety of possible issues from a belt, cracked piston, and EVAP purge canister. The knock is inconsistent and seems to be the worst when I’m at a complete stop. What could it be?

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**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:** [February 11, 2019, 5:04pm UTC](https://community.cartalk.com/t/2009-ford-crown-victoria-knocks/134410/2 "2019-02-11T17:04:53Z")

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Do you have a CEL on?