# SR20det non firing piston

**URL:** <https://forums.speedlife.net/t/sr20det-non-firing-piston/116592>\
**Category:** SON240sx Automotive\
**Created:** [June 27, 2008, 12:11pm UTC](https://forums.speedlife.net/t/sr20det-non-firing-piston/116592 "2008-06-27T12:11:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Two4Tchaz](https://avatars.discourse-cdn.com/v4/letter/t/9fc348/32.png) [@Two4Tchaz](https://forums.speedlife.net/u/Two4Tchaz)\
**Post date:** [June 27, 2008, 12:11pm UTC](https://forums.speedlife.net/t/sr20det-non-firing-piston/116592/1 "2008-06-27T12:11:11Z")

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I have a 1990 hatchback s13 sr20det redtop, car is running rough; really shaky engine . Black smoke coming from the exhaust. And also very boggy. So I think the piston is not firing. I take the coil on plugs off and in the hole where the plug goes on cylinder 3 its darker then the other ones and smells like gas, what’s gone is it my spark plug or coil on plug or is it something I don’t want to know about!  
Please help get her back on the road!

Thanks  
Chaz

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**Author:** ![Keez](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/keez/32/5570_2.png) [@Keez](https://forums.speedlife.net/u/Keez)\
**Post date:** [June 27, 2008, 12:35pm UTC](https://forums.speedlife.net/t/sr20det-non-firing-piston/116592/2 "2008-06-27T12:35:53Z")

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is the spark plug tight? try unplugging another coil pack and plugging it into #3, if it starts firing you got a bad coil.

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**Author:** ![Two4Tchaz](https://avatars.discourse-cdn.com/v4/letter/t/9fc348/32.png) [@Two4Tchaz](https://forums.speedlife.net/u/Two4Tchaz)\
**Post date:** [June 27, 2008, 12:43pm UTC](https://forums.speedlife.net/t/sr20det-non-firing-piston/116592/3 "2008-06-27T12:43:46Z")

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Thanks for proving I’m a total idiot the spark plug is loose tightened now its fine I don’t know how it backed itself off but who knows thanks again please delete  
Chaz

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**Author:** ![Keez](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/keez/32/5570_2.png) [@Keez](https://forums.speedlife.net/u/Keez)\
**Post date:** [June 27, 2008, 2:12pm UTC](https://forums.speedlife.net/t/sr20det-non-firing-piston/116592/4 "2008-06-27T14:12:00Z")

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lol once apon a time i didnt tighten one down also. it happens