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Old 05-23-2012, 11:52 PM   #26
UK-Wagon
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Quote:
Originally Posted by nismopowerdqg View Post
Uncle scotty, the codes my car is throwing are p0301 p0302 p0303 p0304
Read #12, then read all of the others anyways.... it will give you somewhere to start. Your post is so non informing its almost incomprehensible! There is too much missing information to even begin to help you.
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Old 05-24-2012, 07:54 AM   #27
quazimoto
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Quote:
Originally Posted by shwagondawheels

ok so the MAP sensor in dedicated to the boost map only?

the other cars i,ve had misfire or buck from a bad MAP sensor where MAFlless cars (obviously speed density w/ maybe alpha n blend map on a n/a car) reason for my thought

it's the misfire/buck in the other thread(s) lol
This is not the case as the MAP sensor is not used as the primary airflow sensor. The cars you described are not MAF based fueling so obviously that would be a different issue.
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Old 05-24-2012, 08:26 AM   #28
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on my thread i updated with more information.
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Old 09-13-2012, 04:59 AM   #29
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I've been having misfire issues too. After spending a couple days researching, I also found this thread, he bought a car with misfire issues, and it turned out to be an incorrectly installed head gasket. I just thought I'd post this here so you could add it to your list if you like.

http://forums.nasioc.com/forums/show...hlight=misfire

I'm going to a buddie's house this afternoon to try and fix the problem, I'll be taking a PCV vlave, fuel filter, and some MAF cleaner. Hopefully that will get my issue fixed. Thanks for starting this thread. The only complaint I have about it is that it isn't stuck to the top so that it's much easier to find. Come on mods, get r' done. You know it's the only way to stop almost every person with a misfire from starting another thread about their problem.
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Old 10-23-2012, 05:01 PM   #30
v-technician
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Default Help with misfire in a subaru legacy in S.A

Hi Im new to the forum and do not actually own a subaru.
Convinced one of my friends to buy a forester though and helped him sort out the gearbox (one of the shift solenoids were faulty) agents wanted to replace the valvebody.
Helping another friend with his legacy twin turbo.
The car starts and idles fine.As soon as any electrical load is switch on, the motor starts missfiring.
I would think that this is most likely the alternator even though the charge rate is ok at idle.
I ran a diagnostic check and it came up with a camshaft sensor circuit too low error.
When the car is idling and I unplug the camshaft sensor, the the car almost switches off and when I plug the sensor back,then it idles fine.

Here is a link to my thread on our local forum:
http://www.foresterforum.co.za/showt...=7508#post7508
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Old 10-23-2012, 05:19 PM   #31
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this should be stickied for sure. would've saved me a lot of time when i was trying to discover possible culprits for my misfire without posting a new thread.
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Old 10-23-2012, 09:42 PM   #32
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Quote:
Originally Posted by v-technician View Post
Hi Im new to the forum and do not actually own a subaru.
Convinced one of my friends to buy a forester though and helped him sort out the gearbox (one of the shift solenoids were faulty) agents wanted to replace the valvebody.
Helping another friend with his legacy twin turbo.
The car starts and idles fine.As soon as any electrical load is switch on, the motor starts missfiring.
I would think that this is most likely the alternator even though the charge rate is ok at idle.
I ran a diagnostic check and it came up with a camshaft sensor circuit too low error.
When the car is idling and I unplug the camshaft sensor, the the car almost switches off and when I plug the sensor back,then it idles fine.

Here is a link to my thread on our local forum:
http://www.foresterforum.co.za/showt...=7508#post7508
we never got that car in the usa.....but i would replace that sensor with a known good one and go from there....also, cleaning the sensor may help if the pickup is fouled
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Old 10-24-2012, 02:07 AM   #33
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Default Sorry if this has been suggested

Intake leaks will cause misfire/codes.
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Old 10-24-2012, 08:05 AM   #34
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Quote:
Originally Posted by SlvrRex02 View Post
Intake leaks will cause misfire/codes.
Read #5............
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Old 11-20-2012, 03:25 PM   #35
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I recently had this issue, and #2 was the root cause. The injectors needed to be cleaned.

The technician was able to swap the injectors, and get the misfire code at whatever cylinder he put the injector into. As per the technician, the roughness monitor for the injectors at idle went from ~50 (pre-cleaning) to ~1 (post-cleaning). I pick up the car this afternoon, if there are further details, I will post here...
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Old 12-30-2012, 04:41 PM   #36
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I am having a misfire issue with my 03 WRX.
On Christmas day, I drove out to my parents house. Absolutely no problems. On the ride back, I felt a power loss and could tell that I was getting a misfire. Got it home, checked the codes and found it to be cylinder #2 misfire.
Not but 6 months ago, I had the heads resurfaced, valves replaced, compression checked, new spark plugs (NGK @ .030), all new gaskets and seals..the works..basically. I haven't had any problems with the car till a couple of days ago.

So I started working on the easy stuff. I swapped the coil packs; Still has #2 misfire. Pulled the spark plug, looked just fine but replaced it anyways. Figured it might be a clogged injector so i pulled #2 and #4, cleaned them both, swapped them, got everything back together and was getting a TGV code. Read up on that, rotated the sensor blah blah..no problems with the tgv now but it's now back to a low rpm misfire on cylinder #2.

I took the car out and had no power loss even though the CEL would blink at me, then go away, then come back on 20 seconds later, then go away. The ONLY time you could notice any misfire is under 1500-1700rpms. It will idle at 600 but will shake more than usual.

If anyone has any suggestions, please get back to me before i cut off my arm and leg as payment for a mechanic heh..

Oh, also, here are my modifications:

STI intercooler w/ HKS BOV
3" Catless Exhaust
AEM Short Ram Intake

I do not have a tune on it at this time because quite frankly $600 extra is kind of hard to front. BUT, not having a tune isn't my problem right now as I have driven this bugeye as my daily driver since july with absolutely no problems.

Thanks in advance.
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Old 12-30-2012, 05:24 PM   #37
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Try swapping your MAF with a buddy's known good one? And replace the typical maintenance items like fuel filter (I was about to say replace airfilter too, check your whatever filter anyways)

Last edited by frederik; 12-30-2012 at 06:39 PM.
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Old 12-30-2012, 08:37 PM   #38
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good info
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Old 12-30-2012, 09:09 PM   #39
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I have replaced all 4coil packs with some aftermarket ones,and new plugs, and so far no issues.
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Old 12-30-2012, 09:30 PM   #40
frederik
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Quote:
Originally Posted by MattSuuby View Post
I am having a misfire issue with my 03 WRX.

...

Oh, also, here are my modifications:

STI intercooler w/ HKS BOV
3" Catless Exhaust
AEM Short Ram Intake
I just re read that, no use replacing the MAF if you have an aftermarket intake not tuned for.

The AEM short ram will cause incorrect MAF readings. The fact you ran with it untuned without noticing a problem for x months does not mean it is ok or unrelated to your issue. Searching for my bucking issue, I replaced fuel and air filter and problem actually aggravated until I replaced the spark plugs and MAF.

Try swapping in your oem box and see if it helps, or get a tune.

Then once you have the intake problem addressed, if you still have issues, swap the maf with someone else to see if it helps.
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Old 12-30-2012, 10:09 PM   #41
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I will try that. Just doesn't make any sense as to why it would malfunction now after all this time, especially only to 1 cylinder. I also forgot to add that i put a new fuel filter while the motor was being worked on.
Owell, purchasing my cobb accessport right now. Also, anyone know about the accessports on ebay that are brand new. They are going for $528..
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Old 12-30-2012, 10:21 PM   #42
frederik
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Quote:
Originally Posted by MattSuuby View Post
Just doesn't make any sense as to why it would malfunction now after all this time, especially only to 1 cylinder.
Well it could be a number of things, that is why diagnosing and troubleshooting is not always easy.

It was maybe already messed up because of the short ram but not enough to cause apparent problems, then temperature changes (colder, more dense air) and the air charge is increased, aggravating the issue. Or you improve other components in your search of the issue and that aggravates the other problem (just like replacing my air filter increased my bucking problem, until I replaced plugs and MAF).

Quote:
Originally Posted by MattSuuby View Post
Owell, purchasing my cobb accessport right now. Also, anyone know about the accessports on ebay that are brand new. They are going for $528..
Just so you know, the accessport will not solve your intake issue, unless you get an actual tune from a tuner and not the off the shelf maps, because cobb maps require OEM intake. I don't remember if the STi intercooler is ok with the stage 2 maps from cobb, you might want to read their map notes to confirm.
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Old 12-30-2012, 10:51 PM   #43
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I read the notes and it does say that a SF intake from Cobb does work with their maps. duh.
The only difference between the AEM and Cobb intake is the 90 degree angle.
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Old 12-31-2012, 08:27 AM   #44
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Quote:
Originally Posted by MattSuuby View Post
The only difference between the AEM and Cobb intake is the 90 degree angle.
No,no it is not. Or their mapnotes would say you could use the AEM. Not to mention AEM has made at least 3 different intakes for the bugeyes. And unless you have tried every single thing listed above then what help do you need? People do this all the time. They do 2 or 3 things listed and then ask for help.
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Old 12-31-2012, 08:29 AM   #45
frederik
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Quote:
Originally Posted by MattSuuby View Post
I read the notes and it does say that a SF intake from Cobb does work with their maps. duh.
The only difference between the AEM and Cobb intake is the 90 degree angle.
There is a reason for that. Read some more on aftermarket intakes and tune, it is covered in details on threads here, and I'm pretty sure you'll find something in the stickies.

Long story short, if you mess up the bends or shape or diameter (basically if you change the intake), you mess up the MAF scaling. I take it that Cobb engineered their intake to have same properties as the oem intake so it does not throw off the MAF scaling.
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Old 12-31-2012, 03:38 PM   #46
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Quote:
Originally Posted by MattSuuby View Post
I am having a misfire issue with my 03 WRX.
On Christmas day, I drove out to my parents house. Absolutely no problems. On the ride back, I felt a power loss and could tell that I was getting a misfire. Got it home, checked the codes and found it to be cylinder #2 misfire.
Not but 6 months ago, I had the heads resurfaced, valves replaced, compression checked, new spark plugs (NGK @ .030), all new gaskets and seals..the works..basically. I haven't had any problems with the car till a couple of days ago.

So I started working on the easy stuff.
If you like and trust the guys who did the engine work, you might want to take it back there and ask them to check compression, valve clearances, and timing...everyone makes mistakes.

Otherwise keep on testing the easy stuff.

Reinstall OEM intake (to eliminate that as a variable). Clean MAF or replace with known good one. Check for vacuum leaks (turbo intake, breather hoses are common leak points on cars of this age). Check the grounds. Compression test. Valve clearances.
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Old 12-31-2012, 07:39 PM   #47
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I re-installed the OE intake, but my problem didn't work itself out.
I think that it is going to be the compression of the piston, which is something that I can't confirm without help from a mechanic. I will be taking this to a shop that I've trusted with all my cars. It is just going to suck because I know how expensive it'll likely be..

Quote:
Originally Posted by quazimoto View Post
People do this all the time. They do 2 or 3 things listed and then ask for help.
Also, I would like to point that I read all twelve points posted on the first page. I commend the guy that wrote it because it made me learn a couple things about my car. But to what you said, Quazi, I didn't yell for help at the first sign of trouble. I went through 1, 2, 4, 5, 6 and 11.

3, 7, 8 are things that I just don't have tools for or the knowledge base to do correctly. 9 would not be feasible considering I just had them cleaned. And 10 I put a stock OEM clutch in when I had the motor out, so no phantoms for me heh.

Some of the time, I will try to get around things when I know that people out there know a hell of a lot more than me, but when it comes to my cars, I really do try to do everything myself because firstly, I can save some money and secondly, I want to learn by trial and error so that I will know what to do next time.

Thanks for everyone's input. I will post my progress once I get it out of the shop.
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Old 01-03-2013, 12:02 AM   #48
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Took the car in. Got the compression check done. 0% compression in cylinder #2. Going to be at least 1 grand to just pull the motor and find the problem. Anyone know of someone that sells a complete/master rebuild kit? Not having luck finding a complete kit.
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Old 01-03-2013, 12:10 AM   #49
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Why do our subarus always have misfiring issues? Maybe not literally everybody on here but I had issues 3 times since December 2011.. First time it was 2 plugs, next it was coil pack. Then recently I threw another code for p0301.. Code went away after i cleared it, didnt come back, so I changed all 4 plugs to NGK lazer premium.. I forgot the previous name of spark plugs used
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Old 01-03-2013, 04:37 PM   #50
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Quote:
Originally Posted by MattSuuby View Post
Took the car in. Got the compression check done. 0% compression in cylinder #2. Going to be at least 1 grand to just pull the motor and find the problem. Anyone know of someone that sells a complete/master rebuild kit? Not having luck finding a complete kit.
That happened to me at about 95,000 miles. Flashing CEL, cylinder 2 misfire, zero compression. Turned out to be a burned exhaust valve.

If this is what you have, whoever did the recent valve job may be at least partially at fault (for example, clearances too tight).
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