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Old 09-23-2008, 02:20 AM   #1
1gcrazy
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Default p0031 and misfires after a brand new front o2 sensor and ecu reset

Ok mods...

full turbo back, no cats anywhere
BPM intake pipe and ebay short ram intake
tilted tmic
ported and polished stock turbo
new ngk spark plugs about 3000 miles ago

No tune yet, It's super choppy and isn't running right!
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Last edited by 1gcrazy; 01-30-2009 at 12:48 AM.
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Old 09-23-2008, 05:08 AM   #2
theshadowonme
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Stop driving your car!

Get it tuned....

Nothing else to say!
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Old 09-23-2008, 05:18 AM   #3
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Quote:
Originally Posted by theshadowonme View Post
Stop driving your car!

Get it tuned....

Nothing else to say!
agreed!
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Old 09-23-2008, 07:28 AM   #4
1gcrazy
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Is that really going to cause such dramatic issues like this? I mean i'm getting misfires from the whole engine and the ecu should learn and richen this crap up like it HAD be running. Our cars are not stupid, they should be reading this and if it were a tuning problem dont you think it would be pulling a lean code instead of a misfire??
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Old 09-23-2008, 07:38 AM   #5
1gcrazy
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Old 09-24-2008, 12:05 AM   #6
1gcrazy
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Ok got my hands on a tactrix cable, read the ecu, saved it. Now i'm debating on how exactly I want to write this... find a free map or buy one from XPT. Granted I dont think this is the problem. I keep resetting the ecu and I keep getting the same codes
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Old 09-24-2008, 02:44 PM   #7
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speed bump
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Old 09-24-2008, 02:54 PM   #8
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Ebay intakes are garbage. Do you have the stock air box??? If so, install it and see what happens...
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Old 09-24-2008, 05:40 PM   #9
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Quote:
Originally Posted by JohnnyChimpo View Post
Ebay intakes are garbage. Do you have the stock air box??? If so, install it and see what happens...
Just flashed the ecu with the XPT stage 2 race map. I knew it wasn't the tune.
Anyway, new iridiums gapped right. Good map...

Now the cel is flashing every once and a while then solid. Still trying to read the codes but its running just as ****ty as it was before... sweet.

120 bucks in and i'm nowhere....

Only thing else I can think of is the coils. Any way to test those?

What else could this be? Now it sounds like its on 2 or 3 cylinders....
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Old 09-25-2008, 02:18 AM   #10
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This is gettin really rediculous. Every thread I read someone gets different advice!

I hooked up ECUExplorer and got all 4 misfires and the front bank sensor 1 low circuit er whatever. Basically bad O2.
So then I reinstalled my stock sensor. Then it was intermittent. Now P0302 Cylinder 2 Misfire and P0171 System too lean...

I'm lost.

I'm guessing that coil is bad. It's really hard to tell... My CEL's are very random...
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Old 09-25-2008, 03:17 AM   #11
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Put the stock airbox and the stock BCS back on the car, take off the MBC for god-sakes.

Then report back, if you want to email me some logs I can tell you what the car is doing.
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Old 09-25-2008, 12:20 PM   #12
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Quote:
Originally Posted by theshadowonme View Post
Put the stock airbox and the stock BCS back on the car, take off the MBC for god-sakes.

Then report back, if you want to email me some logs I can tell you what the car is doing.
That would be sweet. Now i have to figure out how to log to a folder
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Old 09-25-2008, 12:25 PM   #13
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The boost controller isn't really on there anymore. I turned it all the way out to only run on the WG's 8lbs er whatever it is. I was having an underboost problem. Thats why it was on there in the first place. The intake was bought due to my front mount intercooler I bought, then sold due to disappointment. I'll be getting an SSAC here shortly hopefully.

I can already tell you it's not the intake or the BC, i'm about 97% sure that its the coil. All the other codes went away with the stock 02 sensor back on and it narrowed down to cylinder 2. So i'm gonna snag a set of coils and see how that does or switch the coils.
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Old 09-25-2008, 12:46 PM   #14
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Quote:
Originally Posted by 1gcrazy View Post
Is that really going to cause such dramatic issues like this? I mean i'm getting misfires from the whole engine and the ecu should learn and richen this crap up like it HAD be running. Our cars are not stupid, they should be reading this and if it were a tuning problem dont you think it would be pulling a lean code instead of a misfire??
The problem is you have no idea what your doing.You have installed three of the most problematic parts on your car with no tuning.Ditch the ebay intake,BOV and MBC.Even if they were not the root of the problem (which they probably are) it excludes them as being part of the problem if nothing changes.Is is basic problem solving stuff.Your car is only going to try and fix the AFR's in closedloop.The ECU does not use O2 sensor feedback for Openloop fueling.It relies on the MAF which probably has a skewed signal from your craptastic ebay intake.You do understand how and why an aftermarket intakes,BOV's create a potential problem for these cars right?
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Old 09-25-2008, 01:22 PM   #15
1gcrazy
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Originally Posted by dumdum View Post
The problem is you have no idea what your doing.You have installed three of the most problematic parts on your car with no tuning.Ditch the ebay intake,BOV and MBC.Even if they were not the root of the problem (which they probably are) it excludes them as being part of the problem if nothing changes.Is is basic problem solving stuff.Your car is only going to try and fix the AFR's in closedloop.The ECU does not use O2 sensor feedback for Openloop fueling.It relies on the MAF which probably has a skewed signal from your craptastic ebay intake.You do understand how and why an aftermarket intakes,BOV's create a potential problem for these cars right?
Alright dude.
I'm all for constructive criticism but do not insult me.

Sure they may be the most problematic parts but that doesn't mean they're the problem. Use your eyes and read where I say ITS RUNNING ON 3 CYLINDERS.
Good thing I'm too much of a noob to figure out if its not the spark plugs, which were changed yesterday that it HAS to be the coils. It's not fuel because I can smell the fuel from sticking my nose in the tailpipe. It's not air because my wideband is showing uber rich. If you think I dont know what i'm doing, you're sadly mistaken.

Also take a gander at where I posted that it was night and day. It was running great the until I installed the 02 sensor. NIGHT AND DAY. Like a light switch do you understand lightswitch?

So something triggered a weak point. I'm betting coil. The damn car is tuned for the intake and the bov so your logic is out on that one.
Thanks for the advice though.... wherever it is...

Oh and by the way, the intake toob is the same diameter as the stock one with a KnN panel filter.

Last edited by 1gcrazy; 01-30-2009 at 01:17 AM.
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Old 09-25-2008, 01:33 PM   #16
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Go over your grounds too. A bad gound gave me misfires and made the car run like crap. Took me over a week to find it, when it was the simplest fix. I can't think if any other reason for your brand new front 02 sensor to be throwing codes.
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Old 09-25-2008, 01:45 PM   #17
JohnnyChimpo
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Quote:
Originally Posted by dumdum View Post
The problem is you have no idea what your doing.You have installed three of the most problematic parts on your car with no tuning.Ditch the ebay intake,BOV and MBC.Even if they were not the root of the problem (which they probably are) it excludes them as being part of the problem if nothing changes.Is is basic problem solving stuff.Your car is only going to try and fix the AFR's in closedloop.The ECU does not use O2 sensor feedback for Openloop fueling.It relies on the MAF which probably has a skewed signal from your craptastic ebay intake.You do understand how and why an aftermarket intakes,BOV's create a potential problem for these cars right?
You shouldn't disregard this. There is alot of useful information in the above post what could be potentially wrong with your car. If your positive that it HAS to be the coils, why even mention the 02 sensor?? At least switch the intake out with the factory one... It won't hurt, that's for sure.
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Old 09-25-2008, 01:46 PM   #18
1gcrazy
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Originally Posted by Rodwrx23 View Post
Go over your grounds too. A bad gound gave me misfires and made the car run like crap. Took me over a week to find it, when it was the simplest fix. I can't think if any other reason for your brand new front 02 sensor to be throwing codes.
It's actually a bosch sensor. I was blown away at how sensitive these cars are to a less than OEM sensor. Never had that happen before.

I do have a grounding kit installed. Rubbed off paint on all grounds at about 6 points or more...
Thanks for the bump and the suggestion.
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Old 09-25-2008, 02:50 PM   #19
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I have a grounding kit too and I had checked all of those. My problem was the factory grounding point on the driver's side intake manifold. It shared that hole with a bracket for my FMIC and it was kind of hidden.
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Old 09-25-2008, 02:55 PM   #20
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ill take a look
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Old 09-26-2008, 02:08 AM   #21
1gcrazy
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Bad #3 coil and the Bosch o2 sensor was masking it by screwing with the ecu...

Stock o2 back in and 30k mile coils, thing runs like a champ.

GOD! i'm such a newbie.... Glad I didn't jump on the OMGFREAKOUTITSGONNABLOWUPWEEEEE intake bandwagon... Good thing I have NO clue what i'm doing....

Thanks to those of you that actually did help and put forth a NICE, genuine effort. Thank you.
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Old 09-26-2008, 05:09 AM   #22
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Your car still isn't tuned for the intake, but I'm glad you got it fixed.
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Old 09-26-2008, 07:01 AM   #23
1gcrazy
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Quote:
Originally Posted by theshadowonme View Post
Your car still isn't tuned for the intake, but I'm glad you got it fixed.

Liar....


http://www.plasmatize.com/xptstore/i...products_id=52

-Stock TD04 Turbo (Can be ported/Polished)
-STi Top Mount Intercooler (Spearco, APS, CSS are OK too)
-Gutted UpPipe or STi Catless UpPipe
-A turbo-back exhaust (catted or catless OK, Ported exhaust manifolds are OK too)
-Samco Turbo Inlet (BPM, Gimmick, Perrin are OK)
-Injen Cold Air Intake with a CLEAN FILTER (or APS 65mm CAI)
-GM Boost Control Solenoid
-Walbro 255lph Fuel Pump, Stock 02-05 WRX Injectors
Further instructions will be provided upon receipt of your new map. This will include details on how to adjust your wastegate actuator arm, and proper map break-in procedures/tips.
MAKE SURE YOU HAVE POPUP BLOCKERS DISABLED BEFORE USING THE ONLINE DOWNLOAD!

She's running at 11.5 to 12 at wot in most gears. Still room for improvement but being a noob to flashing this is a great starting point. Glad I ponied up.
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Old 09-26-2008, 08:51 AM   #24
Rodwrx23
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Glad you got it taken care of man. There's nothing more frustrating than swapping in new parts with no results. I only buy factory replacement parts, but I wouldn't have figured a Bosch 02 sensor would screw with the ecu like that.
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Old 09-26-2008, 12:07 PM   #25
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Quote:
Originally Posted by 1gcrazy View Post
Liar....


http://www.plasmatize.com/xptstore/i...products_id=52

-Stock TD04 Turbo (Can be ported/Polished)
-STi Top Mount Intercooler (Spearco, APS, CSS are OK too)
-Gutted UpPipe or STi Catless UpPipe
-A turbo-back exhaust (catted or catless OK, Ported exhaust manifolds are OK too)
-Samco Turbo Inlet (BPM, Gimmick, Perrin are OK)
-Injen Cold Air Intake with a CLEAN FILTER (or APS 65mm CAI)
-GM Boost Control Solenoid
-Walbro 255lph Fuel Pump, Stock 02-05 WRX Injectors

Further instructions will be provided upon receipt of your new map. This will include details on how to adjust your wastegate actuator arm, and proper map break-in procedures/tips.
MAKE SURE YOU HAVE POPUP BLOCKERS DISABLED BEFORE USING THE ONLINE DOWNLOAD!

Not seeing where it says ebay intake..........
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