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Old 08-04-2018, 02:13 PM   #51
wangmauler
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Join Date: Sep 2016
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Location: Rhode Island
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Question

I also have this random misfire issue in my '13 wrx. For me it happens every 400-2000 miles or so, and it's the same random misfire in different cylinders.

Soldered all the contacts in the marked areas just to be sure. There was this guppy black sticky crap that someone stupidly put in there, some kind of sealant. It was all around the wires and even looked to be possibly breaking contact inside the crimps. I cleaned them and soldered the wires correctly, sealed them too.





After about 1200 miles, sure enough the check engine light popped on, with slightly rough idle, same code.

I did a leak down test, then a compression test, which both seemed to be normal, with compression being even throughout the 4 cylinders.

Any ideas?
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Old 08-24-2018, 02:30 PM   #52
super_subie
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just got the same code today P0300/PFFFE

I was on the way to work and at the stop light, the CEL, Crusie, and Traction Control lights all go up at the same time. The car drove fine to work, no misfire, no sluggish acceleration, nothing.

I've had the car since 2013 and i am the first and only owner of this car. I guess I'll pull the wiring harness this weekend and check out the soldering. Car is at 75k now and have done every service except the 75k service because it just turn 75k this past weekend. I was planning to take it in this labor day weekend for the 75k service but i guess now its going to end up being more than the 75k service
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Old 10-02-2018, 03:31 PM   #53
Bishop
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Ass, grass or cash
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Any more updated fixes to this guys? Got a buddy who's going through this exact problem.
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Old 10-06-2018, 02:45 PM   #54
SJSC1608NJ
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2014 WRX Hatch
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I still cant figure it out. I found 2 bad grounds I replaced. New wire harness from dealer, 4 sets of spark plugs. i guess maybe coil packs or the pins. gas and a match.
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Old 10-18-2018, 08:08 PM   #55
Pandafactory
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Default 2013 WRX 53k P0300

2013 WRX 53k I ran into P0300 CEL along with cruise light. I purchased revised harness and installed. Code came back within 100 miles. Car is running perfectly fine. Subaru of America will not give me any resources on this issue. Not sure what to do. Intake appears happy and tight (Cobb short)
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Old 12-11-2018, 04:48 PM   #56
SJSC1608NJ
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Quote:
Originally Posted by SJSC1608NJ View Post
I still cant figure it out. I found 2 bad grounds I replaced. New wire harness from dealer, 4 sets of spark plugs. i guess maybe coil packs or the pins. gas and a match.
So like I said, I had found 2 bad ground wires. Both corroded and frayed. I replaced them, Cleared codes and its been a long time since the cell has been on for random misfires. So check all your ground wires.
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Old 12-11-2018, 10:32 PM   #57
AcquaCow
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Quote:
Originally Posted by AcquaCow View Post
So my 2011 has been misfiring at idle lately and I wandered upon this and the WRXForums thread.

I wiggled/flexed the harness while the shuddering was going on and it definitely has an affect. Guess I'll be un-looming it and cleaning all the pins and soldering that crimp...
Been over a year since my wiggling and massaging of that area of the harness. Misfires haven't come back.
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