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Old 04-21-2015, 07:45 PM   #1
Area35
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Question P0302, P0304, C0042, P0000. Help!

Hello everyone, I'm new here.

I just bought my 2010 STI not even a week ago and love the thing. When cruising a few days ago my check engine light came on, cruise control was flashing, and traction control disabled. I checked the codes and got:

P0302 - Cylinder 2 misfire
P0304 - Cylinder 4 misfire
C0042 - Power Supply Voltage Failure
P0000 - ???

I reset the codes and ran some injector cleaner and the car seems to run better now. I noticed when I got it it would sometimes jerk around 2k rpms. I've also read this could be "GR stock stumble". I don't seem to have it as much now. The codes came back after another 200kms. The car doesn't feel like its lost any power, pulls hard.

Any ideas what could cause a misfire on the same side? The oil level seems good, I cleaned the MAF with CRC cleaner, ran injector cleaner and some seafoam after that. I don't think it is too serious because all power is still there. The plan is to check the plugs and coils this weekend.

A couple questions:
1. Could this stock stumble throw misfire codes?

2. Any chance the misfires are related to the "power voltage supply failure" CEL whatever that code means?

Would love to get this issue resolved so I can enjoy the car worry free!

EDIT: I have looked at the sticky regarding misfires and have been looking all over. I can't seem to find any info on cylinders 2 and 4 misfiring along with the other codes.
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Old 04-22-2015, 06:22 AM   #2
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Bump. Really need help with this!
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Old 04-22-2015, 06:53 AM   #3
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with the engine running at operating temperature

take the oil filler cap off and if you have exhaust blowing out the hole, yer motor is done
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Old 04-22-2015, 06:54 AM   #4
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Mods?
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Old 04-22-2015, 06:55 AM   #5
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For god's sake, don't scare the man...
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Old 04-22-2015, 10:15 AM   #6
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With the power supply code go get your battery tested. As far as the 302 and 304 there's a misfire thread on this forum with everything you need. But easier thing to try. Swap the could from your left side to the right side. Since you have cylinder 2 and 4 on the the Dr side. Look and see if the coil boots have a lot of white residue. A lot of times when they detail cars they can get water in there when spraying down the engine. Also while your there. Replace the plugs with the FACTORY plugs not OE like and not " better then OE"
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Old 04-22-2015, 11:28 AM   #7
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The car is bone stock. Already took the oil cap off and there's no smoke coming out
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Old 04-22-2015, 01:07 PM   #8
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The "Stumble" only happens when you start adding mods to the car like intake and exhaust. Not even a protune will fix it, since the problem are the fuel dampeners themselves. The stock fuel rails are **** too, so that doesn't help. Upgrading the fuel system is the only choice. But since you don't have mods then it could be another problem altogether. I'd say bring it to a dealer or a performance shop and have them diagnose it for you, even if it's $100, you'll get professional help.
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Old 04-22-2015, 08:15 PM   #9
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So an update on this issue, I'm puzzled. So my engine light is off now but my power steering whines like a big blower. Any way that could throw a code? Or anyway that it could be related? I'm so confused
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Old 04-22-2015, 08:21 PM   #10
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Quote:
Originally Posted by UrdnotWrexSTi View Post
The "Stumble" only happens when you start adding mods to the car like intake and exhaust. Not even a protune will fix it, since the problem are the fuel dampeners themselves. The stock fuel rails are **** too, so that doesn't help. Upgrading the fuel system is the only choice. But since you don't have mods then it could be another problem altogether. I'd say bring it to a dealer or a performance shop and have them diagnose it for you, even if it's $100, you'll get professional help.

go away....
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Old 04-22-2015, 09:04 PM   #11
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Nope!
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Old 04-23-2015, 01:14 AM   #12
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oh jesus h ****ing Christ
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Old 04-23-2015, 09:09 PM   #13
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UPDATE:

After running two bottles of injector cleaner (STP, and Seafoam) the car seems to be running better without any hesitations. No CEL as far as the last 500kms go and usually it would come on within 150. So hopefully we are all good to go, thanks for the help!
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Old 04-23-2015, 09:14 PM   #14
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Make sure to use good quality, clean gas. Your injectors may have had dirty fuel running through them: http://www.toptiergas.com/retailers.html
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Old 04-23-2015, 09:16 PM   #15
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Great, thanks! I have a company gas card (lucky me) so I always fill up at Shell with their V-Power

EDIT: Possibly the previous owner was running 87 octane? I sure hope not though
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Old 04-23-2015, 09:20 PM   #16
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Shell wouldn't be the best choice for our type of cars. Shell gas has lots of cleaners and additives, especially V-Power. Take a pic out of any of those Top Tier brands and do some research on what you think is best, except Shell.
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Old 04-23-2015, 09:58 PM   #17
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Quote:
Originally Posted by UrdnotWrexSTi View Post
Shell wouldn't be the best choice for our type of cars. Shell gas has lots of cleaners and additives, especially V-Power. Take a pic out of any of those Top Tier brands and do some research on what you think is best, except Shell.

do you know how I know you don't really know **** about gasoline and are, in fact and idiot???

yeah


did you know that all gasoline is regionally different and even different by county and city....depending on emissions regs???

and...you don't know ****

in MANY places Shell is the best gas you can get


oh...and its the detergents and additives that MAKE gas top tier or not

and I could go on for hours....
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Old 04-23-2015, 10:03 PM   #18
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Old 04-23-2015, 10:06 PM   #19
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Quote:
Originally Posted by Uncle Scotty View Post
do you know how I know you don't really know **** about gasoline and are, in fact and idiot???

yeah


did you know that all gasoline is regionally different and even different by county and city....depending on emissions regs???

and...you don't know ****

in MANY places Shell is the best gas you can get


oh...and its the detergents and additives that MAKE gas top tier or not

and I could go on for hours....

Wow "Uncle" Scotty! You really know your stuff! I can't believe you're a real "Guru"! It's like you know EVERYTHING! Amazing!
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Old 04-23-2015, 10:28 PM   #20
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Lol I can't tell if you two are actually trolling each other or joking around
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Old 04-23-2015, 10:41 PM   #21
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Uncle Scotty is the "guru" here. Listen to what he says. Everyone else who gives advice is an "idiot" lol
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Old 04-23-2015, 11:01 PM   #22
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Up here in Canaduh shell is pretty much the best we have available (OP is up here too).
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Old 04-23-2015, 11:56 PM   #23
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Quote:
Originally Posted by UrdnotWrexSTi View Post
Uncle Scotty is the "guru" here. Listen to what he says. Everyone else who gives advice is an "idiot" lol

d000000000000d

it is GLARINGLY APPARENT that you are FOB, here

FOB boiz are way better off posting less and reading more

but you too stupid to see that, aren't ya

http://forums.nasioc.com/forums/show...postcount=1361

this is PROOF of st00pid
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Old 04-24-2015, 12:07 AM   #24
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Someone is mad and turning to insults, writes like an angry 10 year old kid too... And a spun bearing is a sign of stupid apparently. Because you know, Scotty here has never had a car break on him...
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Old 04-24-2015, 11:18 AM   #25
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Quote:
Originally Posted by UrdnotWrexSTi View Post
The "Stumble" only happens when you start adding mods to the car like intake and exhaust. Not even a protune will fix it, since the problem are the fuel dampeners themselves. The stock fuel rails are **** too, so that doesn't help. Upgrading the fuel system is the only choice. But since you don't have mods then it could be another problem altogether. I'd say bring it to a dealer or a performance shop and have them diagnose it for you, even if it's $100, you'll get professional help.
Where is your proof that the stock fuel rails are ****. Take your time. I'll wait.
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