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Random backfire

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Old Nov 13, 2010 | 07:36 AM
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faraco3
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Car Info: 06 STi 293hp/310tq / 2.5 FLI tune
Random backfire
I have a 2006 sti that is all stock, it just passed 29000 miles. In the past week I have got two random backfires while I shift through the gears. Both times were on different days and through different gear changes. The first was shifting between second and third and the second was shifting from third and fourth. RPM's were around 4500 at the shifts, thats where I have the little beep set at on the tach.
The car runs fine, no leaks, no hesitation, oil is good (changed last weekend around 2900 miles), the coolant is good. Could this be an exhaust leak at the heads and exhaust manifold?
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Old Nov 13, 2010 | 09:30 AM
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Car Info: 2005 LGT wagon
Swing by the shop, I'll look at it for you.
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Old Nov 13, 2010 | 10:16 AM
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You opened today? I work mon-fri in west sac and really cant leave. I get off on friday at 5pm.
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Old Nov 13, 2010 | 10:27 AM
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Car Info: 2006 CGM Impreza WRX/ 1998 RBP Impreza 2.5RS
That's exactly why I can never make it to paul's shop to get my CEL checked out. **** sucks. lol
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Old Nov 13, 2010 | 10:54 AM
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Originally Posted by faraco3
You opened today? I work mon-fri in west sac and really cant leave. I get off on friday at 5pm.
I'm here today.
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Old Nov 13, 2010 | 11:04 AM
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Sounds like an exhaust leak or possibly a bad tank of gas. Bad gas can either throw off the fuel trims and cause a rich condition. A leak in the BPV return line is also a possible cause. We're here all day today if you'd like to swing by.

Thanks
-- Ed
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Old Nov 13, 2010 | 11:33 AM
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Car Info: 06 STi 293hp/310tq / 2.5 FLI tune
Originally Posted by Paul@dbtuned
I'm here today.
I'm in GV, takes me about an hour to get there. When will you be there till?
Last edited by faraco3; Nov 13, 2010 at 12:12 PM.
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Old Nov 13, 2010 | 12:16 PM
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Car Info: 06 STi 293hp/310tq / 2.5 FLI tune
Originally Posted by EQ Tuning
Sounds like an exhaust leak or possibly a bad tank of gas. Bad gas can either throw off the fuel trims and cause a rich condition. A leak in the BPV return line is also a possible cause. We're here all day today if you'd like to swing by.

Thanks
-- Ed

I only use 76 or shell gas, not saying that those are the best but I never use the "cheap" gas stations. I will look at the vacuum lines. Sorry Ed, Fairfield is just a little too far to drive today.
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Old Nov 13, 2010 | 12:34 PM
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EQ Tuning
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Originally Posted by faraco3
I only use 76 or shell gas, not saying that those are the best but I never use the "cheap" gas stations. I will look at the vacuum lines. Sorry Ed, Fairfield is just a little too far to drive today.
No problem... I know its a long drive. BTW, even the brand name stations will have a bad tank once in a while.

-- Ed
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