Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

WRX is spuddering after a fuel fill up

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Old 12-12-2011, 07:24 PM
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Join Date: Dec 2010
Location: Fremont
Posts: 47
Car Info: 2007 WRX TR
WRX is spuddering after a fuel fill up

Hi I-Club

I gassed up my 07' WRX after work today at 76 station with 91 octane and noticed as soon as i entered the freeway the lack of power and sputtering around 2,500-3,000RPM. Has anyone else had this problem with bad gas?

I'm trying to figure out if its bad gas or a coincidence.

When i park the car and rev in neutral it doesn't sputter at all it's only when i'm in gear that it occurs.

Any suggestions?

My car is 100% stock. no mods at all
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Old 02-01-2012, 10:47 AM
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Car Info: 2007 WRX TR
Just an FYI.

LIC Motorsports found the problem to be a knock sensor. It was malfunctioning without throwing CEL.
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