# My 2005 300c Hemi knocking and won’t start

**URL:** <https://community.cartalk.com/t/my-2005-300c-hemi-knocking-and-won-t-start/128839>\
**Category:** Maintenance/Repairs\
**Created:** [November 14, 2018, 3:02pm UTC](https://community.cartalk.com/t/my-2005-300c-hemi-knocking-and-won-t-start/128839 "2018-11-14T15:02:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tremayne](https://avatars.discourse-cdn.com/v4/letter/t/85e7bf/32.png) [@Tremayne](https://community.cartalk.com/u/Tremayne)\
**Post date:** [November 14, 2018, 3:02pm UTC](https://community.cartalk.com/t/my-2005-300c-hemi-knocking-and-won-t-start/128839/1 "2018-11-14T15:02:53Z")

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My car started overheating yesterday so I checked it and filled it up with antifreeze but the it started smoking again and then shut off. The only way I can get it to start is if I pump the gas pedal the whole time but it gives off a really hard knocking sound like there is rocks bouncing around in the engine

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**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\
**Post date:** [November 14, 2018, 3:07pm UTC](https://community.cartalk.com/t/my-2005-300c-hemi-knocking-and-won-t-start/128839/2 "2018-11-14T15:07:56Z")

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your motor is fuel injected. you do not need to pump the gas pedal  
if you want, hold it down 1/2 way as you crank. that will richen the fuel mixture  
it does not sound good though from your description.  
tow to a mechanic to have him give you the news?

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [November 14, 2018, 4:34pm UTC](https://community.cartalk.com/t/my-2005-300c-hemi-knocking-and-won-t-start/128839/3 "2018-11-14T16:34:54Z")

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> [@Tremayne](#):
>
> hard knocking sound like there is rocks bouncing around in the engine

You overheated the engine and destroyed it. Get ready for a very large repair bill, or get ready to scrap it. Sorry.