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Old 09-10-2013, 08:27 PM   #1
99pgpgt
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Default 13 wrx misfire issue...strange fix

So in my 13 for the past month or so I have had a rough idle/misfire like issue. The weird thing about it was that it didn't happen all the time. It stopped doing it for awhile until this past Saturday when the engine light came on for a P0300. I cleared the code since the dealer was closed and drove. I ran the tank down low thinking it may have been a bad mix of gas. I filled up yesterday and the car felt fine. Consisten WOT pulls and everything. Until today..I get out of class, start my car and it is idling crappy as hell. Then as I'm pulling out, the engine light comes on. I thought perfect. So I went to the Subie dealership and let them check it out for the second time for this issue.

Tech scanned it and the miss was jumping between all 4 cylinders!! Weird huh?

So he comes out and talks to me for a bit. He mentions that there is a ground wire that splits into 4 separate wires and there has been issues of the connection coming loose. I thought, well, an electrical issue would make sense since it doesn't do it all the time. He peeled back the wrapping and dropped some solder on the connection and what do you know...The miss is gone and it is smooth as hell.


Just wanted to share this with anyone who may have the same odd miss issue with their 08+ WRX or STi.
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Old 09-10-2013, 10:28 PM   #2
mjiWRX
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Hey man....I've had the same thing happen to me recently! Where is the grounding wire? I guess I can have the tech take a look. Thanks for the report.
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Old 09-11-2013, 01:48 PM   #3
99pgpgt
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Quote:
Originally Posted by mjiWRX View Post
Hey man....I've had the same thing happen to me recently! Where is the grounding wire? I guess I can have the tech take a look. Thanks for the report.
It is in this section of harness

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Old 09-12-2013, 06:13 PM   #4
Almentm
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This literaly just happened to me. Sounded a little strange after getting 93 Octane from chevron, then engine started shaking and had a rough idle, then the lights came on. The code reader did say P0300... Any updates on this? Gonna be a PITA taking the DP off and taking to the dealer so seeing if there is any insight on this matter...
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Old 09-13-2013, 12:52 PM   #5
Kraken850
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I've had the same thing in my '13 WRX although my code was P0300 Random/Multiple Cylinder Misfire. My dealership told me I needed a new engine harness and now it makes sense. This must be a widespread issue because it took them a month to get the part!
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Old 09-17-2013, 10:43 PM   #6
mjiWRX
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Thanks for showing me this!!! You rock! I am still getting some crazy ass random idle issues. This has got to be the cause.
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Old 09-19-2013, 01:17 AM   #7
corvid
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Same issue, same fix as documented in the 11+ discussion thread. Didn't last for me.
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Old 09-21-2013, 05:45 PM   #8
Kraken850
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FYI they replaced my intake manifold gasket while they were doing it. Is that normal?
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Old 09-21-2013, 05:53 PM   #9
codesoccer
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This is ridiculous. These cars have too many issues compared to the GD cars.
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Old 09-22-2013, 12:26 AM   #10
sc00by4life
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Quote:
Originally Posted by Kraken850 View Post
FYI they replaced my intake manifold gasket while they were doing it. Is that normal?
If something has to get removed that has a gasket, a new gasket is used on reinstallation.
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Old 09-30-2013, 03:10 PM   #11
Darkhorse85
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99pgpgt,

Now that it's been a couple weeks, is the multiple-cylinder misfire issue still gone for good?
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Old 09-30-2013, 04:56 PM   #12
99pgpgt
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Quote:
Originally Posted by Darkhorse85 View Post
99pgpgt,

Now that it's been a couple weeks, is the multiple-cylinder misfire issue still gone for good?
Still smooth. No misfire.
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Old 09-30-2013, 07:58 PM   #13
Phantomx55
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I had this exact same issue a few months ago. I couldn't figure it out and tried reflashing my tune which seems to have worked so far. If it starts to happen again I'll get right on this. Thanks for the info.
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Old 09-15-2014, 12:58 PM   #14
99pgpgt
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Gonna bump this once in awhile so people can still find it semi easily if anyone else has this problem.
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Old 09-30-2014, 08:14 AM   #15
WallyHawk
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Just got this issue yesterday Luckily I'm still under warranty but I've had far too many small issues for a 2013 car with 23000 miles on it. Seems like P0300 can mean a lot of things.
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Old 10-03-2014, 08:38 AM   #16
WallyHawk
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Borrowed someone elses car for 3 days since I didn't want to push mine with the misfire. Dealer had the car for one day and they couldn't nail down the problem.

They hooked it up for diagnostics, went for a drive, more diagnostics. Said the misfire was random and they weren't sure why. They reset the computer and cleared the code.

Did 60 miles after picking it up and it's running fine. Just wanted to get this out there in case someone else had a similar issue or if I should be running to a different mechanic in case my engine is a time bomb now (doubt this part).
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Old 02-26-2015, 02:00 AM   #17
Magnumpimplimp
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Default Im having similar issues

I have a 2014 wrx base model. The cylinder misfire code popped up on my dash at around 8k miles, and 2 dealership visits later, the engine wiring harness was replaced. This fix held up for a while, but just a few days ago, at 17k miles, the code returned. I have an appointment tomorrow to check it again. Has anyone had their problem return like this? When my car has this code , the car shifts hard unless i feather it. It is very annoying.
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Old 02-26-2015, 12:13 PM   #18
99pgpgt
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Mine hasn't returned since the dealership fixed it, and that has been about a year and a half ago. Keep us posted on what happens.
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Old 06-03-2015, 11:05 AM   #19
drzdude
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I think I might be having this issue on my 2014 wrx. I did some datalogging and have cylinder roughness bouncing around all 4 cylinders. I want to take it to the dealership but don't feel like taking off my cobb sf intake lol. Thanks for the post makes me feel better, thought something worse was going on.
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Old 06-04-2015, 09:06 AM   #20
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The proper fix is to replace the harness. The new harnesses are available. I did this in 2011 to a wrx and it hasn't been back yet. He still comes in for his oil changes.
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Old 06-04-2015, 08:41 PM   #21
99pgpgt
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Quote:
Originally Posted by Supraru View Post
The proper fix is to replace the harness. The new harnesses are available. I did this in 2011 to a wrx and it hasn't been back yet. He still comes in for his oil changes.
So the new harness I assume is stronger at that connection?
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Old 06-05-2015, 06:40 AM   #22
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Quote:
Originally Posted by 99pgpgt View Post
So the new harness I assume is stronger at that connection?
Yes it's stronger. I call it the wiring harness mod! Lol. Who knows. Originally we repaired them and then they said just replace the harness with a new one but there wasn't anything different Subaru I assume got with the company who made the harnesses and now they have an updated part. Who knows if it's a good thing or bad thing.
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Old 06-05-2015, 07:52 AM   #23
Uncle Scotty
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Quote:
Originally Posted by drzdude View Post
I think I might be having this issue on my 2014 wrx. I did some datalogging and have cylinder roughness bouncing around all 4 cylinders. I want to take it to the dealership but don't feel like taking off my cobb sf intake lol. Thanks for the post makes me feel better, thought something worse was going on.
lol....yer intake may be causing the issue lol

lol.....put the stock intake back on and see lol
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Old 09-10-2015, 07:49 PM   #24
skifreak85353
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Is there a part number for the harness? Is this plug and play or do I need to take it to my shop or a dealer to handle?

This is driving me bonkers. Probably happens to me once a week. Car is running absolutely fine but this damn code gets thrown. Probably the most annoying thing about it is that I can't use cruise control and the dash looks like a damn christmas tree.

Here is the log from today's incident:

P0300
Random/Multiple Cylinder Misfire Detected

Status of this DTC
Confirmed DTC

Engine state when the fault appeared
Freeze frame trouble code: P0300
Fuel system status 1: Closed loop
Fuel system status 2: Unused
Calculated load value: 34.5 %
Coolant temperature: 150 F
Short term fuel % trim Bank 1: +1.6 %
Long term fuel % trim Bank 1: -4.7 %
Intake Manifold Pressure: 11.5 inHg
Engine RPM: 728 rpm
Vehicle speed: 0 mph
Timing advance: 18.0
Intake air temperature: 86 F
Maf air flow: 0.59 lb/min
Absolute Throttle sensor position: 14.5 %
Secondary air status: Atmosphere / off
Oxygen sensor voltage bank1 sensor2: 0.805 Volt
Short term fuel associated to bank1 sensor2: +0.0 %
Time since engine start: 217 seconds
Commanded evaporative purge: 0.0 %
Fuel level input: 69.0 %
Barometric pressure: 29.2 inHg
Control module voltage: 14.355 Volt
Absolute load value: 23.9 %
Fuel/air commanded equivalence ratio: 0.984
Relative throttle position: 3.1 %
Ambiant air temperature: 78 F
Absolute throttle position B: 31.4 %
Accelerator pedal position D: 13.3 %
Accelerator pedal position E: 13.3 %
Commanded throttle actuator control: 0.0 %

Report generated with EOBD-Facile App compatible with iPhone/iPad

Anything out of whack?
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Old 09-11-2015, 12:45 PM   #25
99pgpgt
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The fix is to literally peel back the wire cover, and solder the connection
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