# Astro 4.3

**URL:** <https://community.cartalk.com/t/astro-4-3/30752>\
**Category:** Maintenance/Repairs\
**Created:** [May 20, 2009, 7:10pm UTC](https://community.cartalk.com/t/astro-4-3/30752 "2009-05-20T19:10:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![larrygoodwin](https://avatars.discourse-cdn.com/v4/letter/l/a87d85/32.png) [@larrygoodwin](https://community.cartalk.com/u/larrygoodwin)\
**Post date:** [May 20, 2009, 7:10pm UTC](https://community.cartalk.com/t/astro-4-3/30752/1 "2009-05-20T19:10:26Z")

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My 2000 Chevy Astro just turned 100k. Today it will not start. At end of key turning I get a puff of exhaust from air intake at mass air sensor (intake off) Timing belt jump? If so are valves at risk?

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**Author:** ![David\_Wright](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@David\_Wright](https://community.cartalk.com/u/David_Wright)\
**Post date:** [May 20, 2009, 8:26pm UTC](https://community.cartalk.com/t/astro-4-3/30752/2 "2009-05-20T20:26:39Z")

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doesn’t have a timing belt, it has a chain. I’m assuming its the 4.3 v6. check fuel pressure and spark before assuming this.