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Old 01-23-2020, 06:32 PM   #1
silo31
Scooby Newbie
 
Member#: 507904
Join Date: Oct 2019
Vehicle:
2014 Impreza WRX STi
Dark Blue

Default Stock 2014 WRX STi Hatch misfiring under load

So I have a Stock STi Hatch, bought used, 50k miles on it. After driving it for a couple months the check engine light came on, checked it and it said cylinder 1 & 2 were misfiring (P0301 & P0302). While driving it I noticed the car wouldn’t sound right and slightly lose power after 4,500 rpm. Got together with my cousin to try and fix the issue, at first we thought spark plugs, bought new stock spec plugs and replaced them, still had the issue. Next we thought maybe the coils, bought and replaced 2 with brand new coils bought from Subaru, issue still there. My cousin recommended we swap the other 2, so also did that, issue still persists. Since then been getting same codes. I was told by a buddy driving behind me that my car had some black smoke coming out the exhaust, I was pushing the car past 4K rpms and started to hear the misfires. Any advice guys?
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Last edited by silo31; 01-23-2020 at 06:38 PM.
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