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Old 03-24-2013, 08:27 PM   #1
neurosis05
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Default Misfires and running rich

I've done a ton of research and i've been trying to work out this issue but I thought I'd throw a thread up here just to see what you guys think

05 WRX
Grimspeed catless uppipe
Invida V3 catless DP
Bosal twin tip catback
tuned with cobb AP to 91 oct stage II

In February I was messing around in the the snow on my farm and I hit a chunk of telephone pole that was lying on the ground. Car pushed it out of the way and then I continued to slide up and over a pile of 3" metal pipes. Car was high centered on pipes behind my front wheels and on the DP. All the damage that was done occured on the front. Replaced my bumper cover and radiator with a mishimoto radiator and silicone hoses.

Everything seemed to run fine and I put a little over 200 miles on it. Then one day when it was particularly warm out I got a very rough idle while sitting at a stop light. Check engine light came on and I got the following codes
P0301
P0303
PEEEF

So I changed my plugs and still got codes. Switched my coil packs around and continued to get codes. Cleaned my MAF sensor, still codes. I've also ran some BnG through it to see if I got some bad gas. I've asked my local Subaru community if anyone had an O2 sensor they want to switch out but no dice.

It smells like its running rich. It also seems to only misfire at low RPM. When I go up a hill I can't feel any miss or stumble. I haven't experienced a super rough idle like I did the first time when I was at the stop light, but there is a definite stumble and gassy smell. I can log some data with my AP and post it up here if it helps. I'd hate to buy a new O2 sensor without knowing if mine is bad. Car has about 112,000 miles on it.

hope I didn't leave anything out, thanks for the help
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Last edited by neurosis05; 03-24-2013 at 08:43 PM.
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Old 03-25-2013, 08:33 AM   #2
art@grimmspeed
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Some if the symptoms sound like a bad from 02. Take some logs with the AP and post them up.
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Old 03-25-2013, 09:34 AM   #3
neurosis05
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I hope I did this right. Bellow are links to google drive which should give you access to a spread sheet that contains the logs. Let me know if I screwed it up. These should be the AF sensor 1 Ratio
https://docs.google.com/file/d/0B-El...it?usp=sharing
https://docs.google.com/file/d/0B-El...it?usp=sharing
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Old 03-27-2013, 09:46 AM   #4
neurosis05
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bumpers for anyone who can read these logs, or maybe I should just buy a new sensor
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Old 04-02-2013, 02:53 AM   #5
T_woot
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You figure it out?
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Old 04-02-2013, 08:59 AM   #6
JMSok8
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Next step would be to check your fuel system. Misfire on cyl 1 and 3 point to a problem on the right side of the field. Start with a fuel pressure test and report back.
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Old 04-02-2013, 11:14 AM   #7
danger1138
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Did u swap out o2 n see what happened? Still running rich
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Old 04-02-2013, 12:03 PM   #8
greenplates
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o2 sensor
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Old 04-03-2013, 06:27 PM   #9
neurosis05
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sorry I've been away for a while here's the update
replace front O2 sensor and still have codes.
I'll try a fuel pressure test but can only work on it during the weekends
Could this be a timing issue?
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Old 04-05-2013, 11:44 PM   #10
thehanz123
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Boost Leak Test DIY
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Old 04-06-2013, 12:07 AM   #11
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Boost Leak Test DIY
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Old 04-06-2013, 12:50 PM   #12
neurosis05
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Quote:
Originally Posted by thehanz123 View Post
Boost Leak Test DIY
I'm hitting target boost and only having issues at idle. However I have been meaning to make a DIY boost leak tester...
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Old 04-06-2013, 01:12 PM   #13
thehanz123
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Make a boost leak tester so u cam have it for future problems. I would suggest trading MAF sensors with someone or just try to clean that thing as much as possible.
I put a denso MAF from a friends in mine.. Its all the same i think.. And it fixed 2 misfires codes and my lean code

Still was running rich so i hooked up a boost leak tester and found some leaks
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Old 04-06-2013, 08:25 PM   #14
greenplates
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Quote:
Originally Posted by chris@grimmspeed View Post
Some if the symptoms sound like a bad from 02. Take some logs with the AP and post them up.
these words.
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Old 04-06-2013, 09:42 PM   #15
neurosis05
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Quote:
Originally Posted by greenplates View Post

these words.
I already changed my front O2 and posted some logs above before I changed it out.
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Old 04-09-2013, 03:03 PM   #16
neurosis05
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Update. Timing was off. Problem fixed. Thanks for the help
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Old 04-10-2013, 03:06 AM   #17
Lord Quas
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Im pretty sure i have the same exact problem.. Did u align the timing belt urself or take it to a shop?
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Old 04-14-2013, 08:38 PM   #18
neurosis05
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Took it to a shop. I only have one day out if the week to turn bolts. Plus I don't trust myself with timing belts
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Old 04-16-2013, 12:18 AM   #19
Lord Quas
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Yeah i would do the same thing.. How much did you pay?
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Old 04-16-2013, 06:50 PM   #20
neurosis05
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Mechanic charges $85 an hour. it took em 6 hours, but initially they just realigned the old belt and then after they got it up and running they decided it be better to go with a new belt cause the old one was probably stretched. So they tore down everything again. I think they may have given me a discount because of this. If you go with a new timing belt go with "gates".

What issues are you having?
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Old 04-16-2013, 11:06 PM   #21
Lord Quas
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i got the whole new gates racing timing belt kit.. A mechanic took like 10 hours installing my belt for 300$. but l my other mechanic looked at it and it had a Huge gash so he replaced it with another belt.
then i had misfires/lean/rich/crankshaft position sensor codes so i assumed it was put on wrong. But after replacing my MAF and replacing my ic hoses, every code is gone. My car just feels like it has this hidden power it doesn't know how to release.. Like its restricted or something

My bad about the lengthy story lol. Just got out of school

Last edited by Lord Quas; 04-17-2013 at 04:15 AM.
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