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Old 02-23-2010, 01:34 PM   #351
Mike Wevrick
RIP 1/19/64 - 7/23/11
Scooby Guru
 
Member#: 24654
Join Date: Sep 2002
Chapter/Region: NESIC
Location: saraseager.com
Vehicle:
1957 Taggart Comet
atlasshruggedpart1.com

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Originally Posted by Mike Wevrick View Post
* manual
* went on around 2900 miles
* CEL P0303 - Misfire in Cyl 3
* dealer: Mile One (MD)
* mechanic reset ECU, test-drove car
Just got a P0303 again. 61,000 miles. Local garage checked and reset it for free. They asked if I had changed the spark plugs recently. Yes, but 4 months and 2000 miles ago, and the car has been running fine (drove it for 2 days with the CEL and didn't notice anything abnormal). Just a random misfire I guess ...
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Old 09-17-2012, 11:47 PM   #352
racerdane
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Join Date: Aug 2012
Location: Colorado Springs
Vehicle:
2004 WRX
blue

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Originally Posted by eprklims View Post
* transmission: manual
* CE at 160kms (last week - first day i got my car!!)
* codes: P0301 and P0303 - cylinder misfires in #1 and #3
* dealer: Oakville Subaru
* they weren't able to look at it until they have their lead guy there... hopefully this week
Does anybody have any clue as to the long term effect of these misfires? I'm pretty worried about it, but i might just be over cautious
What ended up being the problem i currently have P0171, P0301, P0303, and now P0245 as of today....somebody please help
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Old 10-10-2012, 11:54 AM   #353
Paincake
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2008 WRX
41,000 miles
misfires in cylinders 1,2,3, and 4 also bank 1 running lean.
no dealership trip yet because i live in BFE Louisiana and the closest dealership is forever away.
Took it to the shop i usually go to and changed out the O2 sensor, light went off for 2 days. Came back on this morning. The lights have been coming on since i put the new clutch in. FX300. Other mods to the car are Tsudo down pipe (catless) Invidia N1 down pipe back exhaust (catless) Perrin CAI, Perrin BOV. Pro tuned by AMS.
At first i was thinking the problem was my fuel injectors but i was assured by a subaru guru friend of mine that it wasnt and to change out the O2. Others have told me its my fuel pressure regulator but at the shop everything prety much checks out. Car idles a little rough but drives just fine. Sometimes they will just go off on their own. its not just the CEL everything goes off. My cruise control starts flashing, the CEL, the traction control it all just goes haywire. Could it be a wiring problem caused by taking off the heat shield when i put on the down pipe?
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Old 04-23-2013, 11:00 AM   #354
shanemavt
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Member#: 263478
Join Date: Nov 2010
Chapter/Region: NESIC
Location: Bridgewater MA; Burlington VT
Vehicle:
2002 WRX wagon
Silver

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Just bought my 02 wrx with 167,000 on it a week ago.
*Manual
*P0302 and P0304 (intermittent)
*first came on at 167,175 and turned off at 167,200. Back again 167,275 and still on at 167,320
*no dealer cuz no money advanced auto read it for me

car came with a K&N typhoon intake, not sure if that could be causing anything i just heard they were bad news.

also plugs were done last year by previous owner's local shop not sure who makes them ill try to find the receipt to see if it has the make. Are Bosch plugs a no no? could it be a coil pack?

Please help its my first wrx as my outback sport was totaled 2 months ago
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Old 04-23-2013, 04:02 PM   #355
sajohnson
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Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

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Originally Posted by shanemavt View Post
Just bought my 02 wrx with 167,000 on it a week ago.
*Manual
*P0302 and P0304 (intermittent)
*first came on at 167,175 and turned off at 167,200. Back again 167,275 and still on at 167,320
*no dealer cuz no money advanced auto read it for me

car came with a K&N typhoon intake, not sure if that could be causing anything i just heard they were bad news.

also plugs were done last year by previous owner's local shop not sure who makes them ill try to find the receipt to see if it has the make. Are Bosch plugs a no no? could it be a coil pack?

Please help its my first wrx as my outback sport was totaled 2 months ago
As you probably know, there are several things that can cause a misfire. I am not aware of any way to troubleshoot a problem like that without the type of expensive diagnostic equipment a dealer has. Even then, if it's intermittent there's a good chance a dealer will not be able to pinpoint the cause.

You might consider at least pulling the plugs and looking at them. With 167K miles, the plugs should have been replaced twice already -- at 70K and 140K. There's always a chance that (regardless of what you were told) it wasn't done, or was only done once.

Unless you know for a fact that the plugs were replaced with OE or equivalent plugs within the last 70K miles, you might as well replace them. Worst case -- they were just replaced with the proper type right before you bought it. That would be a waste of $40-$50. However, best case, they are in need of replacement and that solves the problem.

If new plugs don't do the trick and you don't see anything obvious wrong, then I'd take it to a dealer or other qualified shop.

FWIW, my 2002 with ~200K miles throws a 030x code once in a while. I reset it with my Cobb Tuning programmer and it doesn't come back for a long time -- thousands of miles. It runs fine regardless (code or no code). Plugs were last changed at 140K. I'll probably go ahead and do that early if I get another CEL.

I can't imagine how an air filter would cause a misfire, but it's always a good idea to consider/mention any mod like that, just in case.

The K&N controversy will be going on forever (Chevy/Ford; Tastes Great/Less Filling). I won't get into that here except to say that I use them on all of our cars, they're all driven hard, they all have high miles on them (~130k to ~250K) and they burn very little oil -- maybe 1/2-3/4 quart in 7,500 miles.

Good luck!
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Old 04-24-2013, 12:08 PM   #356
shanemavt
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Member#: 263478
Join Date: Nov 2010
Chapter/Region: NESIC
Location: Bridgewater MA; Burlington VT
Vehicle:
2002 WRX wagon
Silver

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Quote:
Originally Posted by sajohnson View Post

As you probably know, there are several things that can cause a misfire. I am not aware of any way to troubleshoot a problem like that without the type of expensive diagnostic equipment a dealer has. Even then, if it's intermittent there's a good chance a dealer will not be able to pinpoint the cause.

You might consider at least pulling the plugs and looking at them. With 167K miles, the plugs should have been replaced twice already -- at 70K and 140K. There's always a chance that (regardless of what you were told) it wasn't done, or was only done once.

Unless you know for a fact that the plugs were replaced with OE or equivalent plugs within the last 70K miles, you might as well replace them. Worst case -- they were just replaced with the proper type right before you bought it. That would be a waste of $40-$50. However, best case, they are in need of replacement and that solves the problem.

If new plugs don't do the trick and you don't see anything obvious wrong, then I'd take it to a dealer or other qualified shop.

FWIW, my 2002 with ~200K miles throws a 030x code once in a while. I reset it with my Cobb Tuning programmer and it doesn't come back for a long time -- thousands of miles. It runs fine regardless (code or no code). Plugs were last changed at 140K. I'll probably go ahead and do that early if I get another CEL.

I can't imagine how an air filter would cause a misfire, but it's always a good idea to consider/mention any mod like that, just in case.

The K&N controversy will be going on forever (Chevy/Ford; Tastes Great/Less Filling). I won't get into that here except to say that I use them on all of our cars, they're all driven hard, they all have high miles on them (~130k to ~250K) and they burn very little oil -- maybe 1/2-3/4 quart in 7,500 miles.

Good luck!
The plugs were done at 147000 per a receipt I got from previous owner (with ngk plugs). Thanks for your response and the advise. The damn CEL went away again last night and I drove 40 miles to work with no issues this morning.

My buddy is a nissan tech so I'm hoping to get it into his shop after hrs and give it a good check. I might play around with the coil packs if it comes back and ill double check the plugs and such then. Thanks again. Hopefully the light is out long enough for me to get it inspected.

Ps. As for the Chevy v. Ford, ill take Chevy.
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Old 04-24-2013, 12:27 PM   #357
Cocoa Beach Bum
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Join Date: Apr 2002
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Quote:
Originally Posted by shanemavt View Post
Just bought my 02 wrx with 167,000 on it a week ago.
*Manual
*P0302 and P0304 (intermittent)
*first came on at 167,175 and turned off at 167,200. Back again 167,275 and still on at 167,320
*no dealer cuz no money advanced auto read it for me
Subaru, over time, issued a series of ECU re-calibrations intended to fix spurious P030x trouble codes for the 2002 WRX. The latest (and greatest?) has the calibration ID (CID) A4SGE01C and includes all ECU fixes issued by Subaru for the 2002 WRX (both AT and MT).
http://techinfo.subaru.com/assets/Re...2534_Files.pdf

Any competent OBD-II scan tool should be able to tell you the current CID of your WRX's ECU. If it is anything other than A4SGE01C, then you might consider having your ECU reflashed to that level. A Subaru dealer would likely charge $$$ to do this for you. But you could also issue an appeal in your regional NASIOC forum asking for someone with a Tactrix cable and appropriate flash jumper connector to do the reflash for you. You could point that kindly person to http://www.scoobypedia.co.uk/index.p...ilityList#toc3 to obtain a copy of the A4SGE01C ECU ROM image.

Just realize that even if your ECU does not have a CID of A4SGE01C, reflashing your ECU to that CID may not necessarily cure your P030x problem.
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