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Old 02-20-2019, 05:44 PM   #1
PEARLWHITE925
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Default '13 p0301 misfire STUMPED please help!

Hi All,

I'm a newbie so sorry if this is misplaced. Hoping to get some help...

Car:
13 WRX 2.5L Turbo Professionally Tuned with Accessport
95k miles (just purchased about 1 month ago)

Fuel up car and car starts and drives super rough on the second start

Thought it was a bad mix of fuel. p0301 and PFFFE misfire codes

Clear codes and run down the tank. Car is running fine. Was a smidge low on oil so it was topped off. Fuel up again and what do you know. Second start after refueling same codes.

Recently cleaned MAF and air cleaner

Changed spark plugs, inspected coil packs (even swapped 1/3 to see if the code would jump to cylinder 3)

After spark plug change, codes still there. Went for a drive and the car ran better than ever. Got home turned off the car, cleared the codes. Went to start the car and it idled like GARBAGE. Took it around the block and it ran super rough.

I'm trying not to get elbow deep in repairs here. Any suggestions where to start?

Do I cough up the money and change all the coil packs?
The spark plugs had some build up but weren't in horrible shape when I changed them.

Is it worth looking into the EGR purge valve? Since it is only after fueling?

Does this sound like carbon build up?

Read an interesting thread about an engine wiring harness issue for this model. https://forums.nasioc.com/forums/sho....php?t=2550077

I appreciate any help you experts can offer. I am expert when it comes to Fords and Hondas, so I can dabble with the parts, just not very well versed on Subarus since this is my first one.

Thanks for any help!
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Old 02-20-2019, 05:50 PM   #2
Charlie-III
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One thing to keep in mind, every time you clear codes, flash a map or disconnect the battery, the ECU loses fine learning.
Some cars are not bad with that.
Other cars need several cold starts and some running to relearn.

This is not just Subaru, this is pretty much ANY car with an ECU.

Beyond that, I will let others with newer Subaru engine experience comment.
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Old 02-20-2019, 06:20 PM   #3
n2oiroc
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check the harness in the thread you linked. its a somewhat common issue and an easy fix to solder it.
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Old 02-20-2019, 07:14 PM   #4
goldfingerfif
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I still don't get how that fixes anything as those wires just connect to EMF shields around the wires. It didn't fix my misfire code but good place to start regardless.
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Old 02-20-2019, 07:18 PM   #5
goldfingerfif
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Can you log roughness for cylinders 1-4 with all the other normal stuff to see how bad it is and when it is occuring? Does your AFR look ok? Timing? AF Corrections and Learn really high? Also check ALL ground connections, that's the lesson I learned.
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Old 02-21-2019, 04:47 PM   #6
PEARLWHITE925
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I will try to log this weekend and get a post up, thanks!
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Old 02-21-2019, 04:47 PM   #7
PEARLWHITE925
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Thanks Charlie-III!
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Old 02-25-2019, 05:29 PM   #8
PEARLWHITE925
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Here is the datalog from a 20 mile drive yesterday. Notice anything that looks out of whack? I'm pretty new to using this, so any feedback you have here is helpful.

https://drive.google.com/open?id=1G2...Nua4j_KMiy80zc
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Old 02-28-2019, 08:47 PM   #9
moldy1
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Default '13 p0301 misfire STUMPED please help!

Bumping and subscribing cause I have a Ď13 with the same exact issue.

Itís been a week since mine threw a misfire code. Cleared code/ reset ecu but then car would stall out when coming to stop.
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Old 03-01-2019, 11:46 PM   #10
moldy1
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Default '13 p0301 misfire STUMPED please help!

Iím pretty new to this too, but for what itís worth, I did a log on mine. My AF learn was all negative and beyond -8%. Yours all seem to be in line with info I found thru link below.

Hereís a link that might help.
https://www.cobbtuning.com/subaru-da...ging-overview/

Last edited by moldy1; 03-02-2019 at 12:08 AM.
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Old 03-07-2019, 04:28 PM   #11
PEARLWHITE925
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UPDATE:

Wiring harness fixed via the link I referenced. Car idles, drives and starts smoothly. Have added fuel twice and no changes.

Thanks @moldy1

Appreciate the link as this helped me actually learn what my Accessport is logging.
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Old 03-18-2019, 01:19 PM   #12
PEARLWHITE925
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UPDATE: Car ran well for several weeks with no issues after having the wiring harness fixed. Filled up the fuel tank this weekend and what do you know... misfire back again with a rough start and idle.

Should I try to change the tune? Really getting frustrated with this.

On another note, I noticed the car is consuming a lot of oil, which there was a class action filed against Subaru about for these motors. Not sure if these could be related.

Thanks for any and all continued help here.

Last edited by PEARLWHITE925; 03-18-2019 at 01:19 PM. Reason: update to first fix
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Old 03-19-2019, 04:22 AM   #13
n2oiroc
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Quote:
Originally Posted by PEARLWHITE925 View Post
UPDATE: Car ran well for several weeks with no issues after having the wiring harness fixed. Filled up the fuel tank this weekend and what do you know... misfire back again with a rough start and idle.

Should I try to change the tune? Really getting frustrated with this.

On another note, I noticed the car is consuming a lot of oil, which there was a class action filed against Subaru about for these motors. Not sure if these could be related.

Thanks for any and all continued help here.
Check the cylinder roughness monitor and see if one stands out. Unfortunately, those symptoms sound like a cracked ringland.
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Old 04-29-2019, 06:59 PM   #14
PEARLWHITE925
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Default Compression Numbers

Sooooo ran a compression test and I am not happy with the numbers

Cylinder 1: 85
Cylinder 2: 105
Cylinder 3: 80
Cylinder 4: 110

Any input? Thanks again for any help here.
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Old 04-30-2019, 08:41 AM   #15
Charlie-III
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Looks like a HG.
You can redo the test but with a shot of oil in the cylinder. If numbers come up, then you also have ring issues.
Or, you can do a leakdown test to see if rings or valves are also an issue.
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