# 96 chevy 4.3 backfires

**URL:** <https://community.cartalk.com/t/96-chevy-4-3-backfires/22318>\
**Category:** Maintenance/Repairs\
**Created:** [November 20, 2008, 10:04pm UTC](https://community.cartalk.com/t/96-chevy-4-3-backfires/22318 "2008-11-20T22:04:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![piltz384](https://avatars.discourse-cdn.com/v4/letter/p/eada6e/32.png) [@piltz384](https://community.cartalk.com/u/piltz384)\
**Post date:** [November 20, 2008, 10:04pm UTC](https://community.cartalk.com/t/96-chevy-4-3-backfires/22318/1 "2008-11-20T22:04:54Z")

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my truck is back fireing when its warm new fuel pump, plugs and wires and new cap and rotor. runs fine when its cold.

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [November 20, 2008, 10:49pm UTC](https://community.cartalk.com/t/96-chevy-4-3-backfires/22318/2 "2008-11-20T22:49:31Z")

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Backfiring through the intake? Or, the tailpipe?  
Common causes are timing is off, or mixture is too lean, or valves sticking. Perform a vacuum test. Here’s how: [http://www.international-auto.com/fiat-lancia-tips-on-reading-gauges/tips-on-reading-gauges-vacuum-gauges.cfm](http://www.international-auto.com/fiat-lancia-tips-on-reading-gauges/tips-on-reading-gauges-vacuum-gauges.cfm) and this: [http://www.secondchancegarage.com/public/186.cfm](http://www.secondchancegarage.com/public/186.cfm)

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [November 21, 2008, 1:05am UTC](https://community.cartalk.com/t/96-chevy-4-3-backfires/22318/3 "2008-11-21T01:05:06Z")

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[http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800bfe20](http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800bfe20)

Then the next thing to check is worn spider injector assembly. Here’s what it looks like and where it’s located.

Tester