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Old 04-26-2012, 07:56 AM   #1
Ptel
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Default Misfireing under load idles fine.

Hello everone I dont spend to much time on forums but I would figure I would ask and give this a shot since I'm kind of scratching my head at this point. My car has about 62k on it and it's an 06 STI. When the car is under load I want to say 50 percent or more the car bucks like a bull machine, misfires, and the check engine lit flashes. I called Rallysport direct and they said it could be overboosting. The code that pulls up sometime is P0301 cylinder 1 misfire. I swaped my plugs and inspected them and they all looked good, so with the new spark plugs the problem was still there. Next I swaped the coilpack from cylinder 3 to cylinder 1, again nothing changed problem was still there I'm about to do a compression test before I take it for a tune. Some people say it is just because i need a tune.

List of powertrain Mods:

Cobb SF Intake

AVO turbo inlet ( problems started occuring about a month after installing
this component )

Tomei Equal Length Headers

Cobb Turbo Back Exhuast

Denso 200w fuel pump ( soon to be installed )

Cobb Stage 2 base Map ( I know I know need a custom tune which I will be geting soon )

Thanks for any input, I checked the stickys and found some things but I'm looking for a more direct answer if that is ok? Again I don't really use forums that much.
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Old 04-26-2012, 11:28 AM   #2
AREA1320
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Make 100% sure the coil pack is plugged into the coil all the way
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Old 04-26-2012, 11:55 AM   #3
Ptel
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I'm 100 percent sure on that one. I even swaped coilpacks from cylinder to cylinder after doing my spark plugs and nothing changed.
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Old 04-26-2012, 12:20 PM   #4
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I had a somewhat similar issue of idling okay but misfiring under load. After trying the steps you've done already to no avail I listened to each fuel injector using the listening through a screwdriver technique. The injector on bank 1 made an occasional "muted" click rather than a constant strong click as it should have. Swapped out the injector and is fixed my issue.
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Old 04-26-2012, 01:02 PM   #5
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I will have to give that a try didn't even think about that.
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Old 04-26-2012, 01:08 PM   #6
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Well all injectors seem to be firing fine looks like i will have to take it for a tune and get some data logging sessions. Any input will still be appreciated I will post the correction if I find out what it is.
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Old 04-26-2012, 02:34 PM   #7
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Bring it to one of the handfull of tuners we have in our area and they will be able to pick it up quickly. Wicked Innovation is right near you as well as AJW Performance. All within a decent drive/tow if necessary. Also DynoTech tuning is a stones throw from you i believe
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Old 04-26-2012, 02:40 PM   #8
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Thanks yeah I plan on going this weekend. Hopefully they can help me get rid of my airbag light too. That randomly came on after installing my ATI center gauge pod cluster and gauges. An yes I check under the seat to the yellow conectors. Unfortunatly that sticky didn't help me out.
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Old 04-26-2012, 02:45 PM   #9
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I know for a fact Wicked is open 10-5 on saturday but you might want to call ahead to see how much they have scheduled.
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Old 04-26-2012, 04:11 PM   #10
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Actually I will most likely be taking it to get tuned by Tony Pinto. I am just getting into the New England car scene and I heard he is the burt reynolds of subaru's........in other words people say he knows his stuff. So we will see I guess. Also one quick question can the the purge control solenoid valve cause any of this?????
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Old 04-27-2012, 02:11 AM   #11
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Does the AVO turbo inlet have a skeleton like the Perrin inlets? Is it possible it's collapsing under load?
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Old 04-27-2012, 08:09 AM   #12
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Yeah it has a skeleton it's also pretty beefy.
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Old 04-27-2012, 01:29 PM   #13
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Actually just took it for a drive on the highway and under full throttle car was fine seems like it's only doing it in 2nd and third gear.
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Old 10-11-2012, 06:42 PM   #14
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Well a little old for an update but couldn't figure out what the problem was just dropped it off at wicked inovations will post what the problem is once they figure it out.
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Old 10-11-2012, 07:54 PM   #15
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__ok.
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Old 10-11-2012, 10:47 PM   #16
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im having a close problem, misfiring in cylinder 3 and 4. lemme know what comes up.
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Old 10-12-2012, 08:34 PM   #17
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I had a problem similar to this...try swapping the spark plug from cyl 1 with cyl 3 and see if the misfire moves with the plug. I ended up having a cracked sparkplug that you couldnt see on the outside (and these were brand new plugs) Just a thought If that doesnt work, we'll have to dig deeper
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Old 10-13-2012, 01:08 AM   #18
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Bad plugs can dos this. But id suspect a issue with a cracked ring land first. Need a leak down test
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Old 10-13-2012, 01:42 AM   #19
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Quote:
Originally Posted by UK-Wagon
Bad plugs can dos this. But id suspect a issue with a cracked ring land first. Need a leak down test
Damn don't say that!! Even if it goes off for a day, then comes on couple days later! Mainly from boosting?
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Old 10-13-2012, 02:49 AM   #20
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Yeah, likely a small crack or 2. It will only get worse.....

I just tore down a guys 06 engine with no issues other than over heating from a blown head gasket. Pulled his pistons out, and bam broken ring lands! He had no idea and no running issues other than it wouldnt stop over heating one day.

Found blown HG between cylinder 3 and the coolant passage. Broken ring lands on 2 & 4 which are the opposite side!
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Old 10-13-2012, 02:59 AM   #21
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Here is 1 pic I took, didnt take any others. Keep in mind this crack is small, but wasnt going to fix its self or get better. It was only a matter of time before it became a misfire along with the other one. Car has 61k on it IIRC
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Old 10-13-2012, 09:54 AM   #22
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Ive seen a few misfires lately with plugs blowing out with a gap of 0.031", reset to 0.028" and it fixed the problem. Not saying this is the case, but spending 20min regapping the plugs is worth trying.
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Old 10-13-2012, 03:27 PM   #23
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Quote:
Originally Posted by theSlothy1 View Post
Ive seen a few misfires lately with plugs blowing out with a gap of 0.031", reset to 0.028" and it fixed the problem. Not saying this is the case, but spending 20min regapping the plugs is worth trying.
Hes not running high boost..... never gonna blow out a plug under 22psi. Its just not going to happen.
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Old 10-13-2012, 03:39 PM   #24
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Ive seen them blow out on one car as soon as the car hit 5psi every time. Regapped them and the car has run great since. My car was blowing out last week at 12psi (0.031"), regapped it smaller and it cured it.
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Old 10-13-2012, 11:56 PM   #25
rymaggi
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Mine was just running a little rich.

Woot woot!
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