# 2003 Mazda 6 will not start

**URL:** <https://community.cartalk.com/t/2003-mazda-6-will-not-start/86594>\
**Category:** Maintenance/Repairs\
**Created:** [August 14, 2014, 3:45am UTC](https://community.cartalk.com/t/2003-mazda-6-will-not-start/86594 "2014-08-14T03:45:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bobolink](https://avatars.discourse-cdn.com/v4/letter/b/2acd7d/32.png) [@bobolink](https://community.cartalk.com/u/bobolink)\
**Post date:** [August 14, 2014, 3:45am UTC](https://community.cartalk.com/t/2003-mazda-6-will-not-start/86594/1 "2014-08-14T03:45:02Z")

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My son’s mazda 6 will turn over but not start. the things I have done

1. replace crank sensor
2. replace cam shaft sensors
3. it has spark
4. fuel pump works
5. sprayed starting fluid in still will not start  
What else should I check?  
Security sytem?

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**Author:** ![bobolink](https://avatars.discourse-cdn.com/v4/letter/b/2acd7d/32.png) [@bobolink](https://community.cartalk.com/u/bobolink)\
**Post date:** [August 14, 2014, 3:47am UTC](https://community.cartalk.com/t/2003-mazda-6-will-not-start/86594/2 "2014-08-14T03:47:45Z")

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Ran rough just before it quit.  
Thermostat stuck closed and engine overheated. replaced thermostat ran good for a day

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [August 14, 2014, 4:11am UTC](https://community.cartalk.com/t/2003-mazda-6-will-not-start/86594/3 "2014-08-14T04:11:45Z")

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Do a compression check. Overheated plus aluminum head can mean breached head gasket. It ran good until the compromised head gasket gave way.