# Backfireing

**URL:** <https://community.cartalk.com/t/backfireing/30040>\
**Category:** Maintenance/Repairs\
**Created:** [May 5, 2009, 1:37am UTC](https://community.cartalk.com/t/backfireing/30040 "2009-05-05T01:37:14Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![skipperoo](https://avatars.discourse-cdn.com/v4/letter/s/cc9497/32.png) [@skipperoo](https://community.cartalk.com/u/skipperoo)\
**Post date:** [May 5, 2009, 1:37am UTC](https://community.cartalk.com/t/backfireing/30040/1 "2009-05-05T01:37:14Z")

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hey,my vp ss 92’ 304 efi commodore has just started to backfire at low reves , but above 3 grand it stops and runs fine, i changed all leads an plugs but i have no idea hope someone can help.skip

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**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\
**Post date:** [May 5, 2009, 2:00am UTC](https://community.cartalk.com/t/backfireing/30040/2 "2009-05-05T02:00:59Z")

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My first guess is a timing issue.

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**Author:** ![MG-McAnick](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mg-mcanick/32/188_2.png) [@MG-McAnick](https://community.cartalk.com/u/MG-McAnick)\
**Post date:** [May 5, 2009, 2:39am UTC](https://community.cartalk.com/t/backfireing/30040/3 "2009-05-05T02:39:40Z")

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Are you absolutely SURE you got the plug wires on right?

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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:** [May 5, 2009, 2:47am UTC](https://community.cartalk.com/t/backfireing/30040/4 "2009-05-05T02:47:48Z")

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Find out which one is causing backfire: Disconnect, and ground (lay the spark plug wire end on the engine block) each spark plug wire. Take note of which one(s) no longer causes backfire when disconnected.