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Old 09-26-2011, 12:42 AM   #1
Subarusesh
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Default STI running rough after WOT pulls.

hello everyone. i need some help with my subie. ok so, I have a 2006 STI. In April, my engine spun a bearing due to oil starvation supposedly so i had a reputable shop build me a short block with all the goods (pistons,rods,ceramic coating, etc) car was tuned after rebuild on E-85, and wasnt driven from july 1st until pretty much now. (maybe 3-4 times earlier this month) i started driving it recently and today was probably the 3rd time ive taken it out (since it sat for those few months) and i took it out on the highway and did 3rd-4th WOT. got off a few exits down, stopped at the stoplight, took a left, and it started idling rough and thru a CEL. stopped at wal mart, let it sit, came back out, started fine, ran fine, no CEL. on way home did a 2nd-3rd WOT pull, stopped, put it in first gear, runs rough, throws CEL. (same exact thing both times) went home and typed this up. I don't have a CEL reader and i hate bringing my subie to the specialist for obvious financial reasons, What could this be??

2006 STI
mods:
perrin turbo back and downpipe(with cat)
fully built shortblock
Sways and endlinks
coilovers
walbro
850 jap corp injectors
Fp HTA68
process west top mount I/C
grimmspeed BCS
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Old 09-26-2011, 01:36 AM   #2
Tryptofan
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This:

Quote:
Originally Posted by Subarusesh View Post
I don't have a CEL reader and i hate bringing my subie to the specialist for obvious financial reasons
and This:

Quote:
mods:
perrin turbo back and downpipe(with cat)
fully built shortblock
Sways and endlinks
coilovers
walbro
850 jap corp injectors
Fp HTA68
process west top mount I/C
grimmspeed BCS
Do not mix. You've either gotta be willing to diagnose these problems yourself, or pay the price (usually at terrible labor rates) and have a real mechanic figure it out for you. An accessport is a small fraction of the price of this mod list - a tactrix cable or simple ODBII reader even smaller. I'm not sure who you were tuned by or what sort of software they use, but there's not much of an excuse not to have something to read and clear codes with this kind of monetary investment in your car. It's also pretty hard to have any idea of what's wrong without knowing the code you're throwing.

I think that someone else might be able to help you, but your best bet without a code reader on a car that modded is to have someone local take a look at it.

Quote:
[The car] wasnt driven from july 1st until pretty much now. (maybe 3-4 times earlier this month) i started driving it recently and today was probably the 3rd time ive taken it out (since it sat for those few months) and i took it out on the highway and did 3rd-4th WOT
And this worries me - cars don't like to sit undriven, especially for months on end, and then be driven hard. About how many miles did you drive between those three times before you had the problem? Also, with something like this, doing a WOT pull right after you've had a CEL probably won't help:

Quote:
stopped at wal mart, let it sit, came back out, started fine, ran fine, no CEL. on way home did a 2nd-3rd WOT pull, stopped, put it in first gear, runs rough, throws CEL. (same exact thing both times)
If it were me, I'd wait to figure out what caused the first CEL and rough running before I go on to repeat what caused it all over again. Unless you're trying to diagnose a problem, it's not a good idea to run your car really hard until you've fixed the original problem. It's my opinion, but from what I've read, ignoring problems like this is how people lose ringlands.

Last edited by Tryptofan; 09-26-2011 at 01:53 AM.
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Old 09-26-2011, 02:25 AM   #3
Subarusesh
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both of those things mix actually. See, i just moved to california from minneapolis, so before i had access to things like cel readers because my father runs bodyshops, my friends own STI's and evo's and things like that. but now im in a place where i dont really have any car "heads" so those things are scarce. I am willing to diagnose my vehicle issues myself, hence why i posted this thread, because i know this is a gigantic forum and people on here have quite the knowledge, perhaps even someone who has had the same problem. so before i go pay a local subie specialist, just looking for some suggestions. and its not like i got the car and went and drag raced it. i took it for some rides around town and then took it on an intense hour long drive reaching in between 80-120mph the entire time. that was a few days after it was shipped to me, around a week and a half ago. no problems then either.
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Old 09-26-2011, 02:28 AM   #4
Subarusesh
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and also, if you threw a CEL, and it went off, you cant read it anymore, like mine. wouldnt you want to know what it was? so you just wouldnt redline your car then because you didnt want to throw the CEL again? you cant really find anything out if the CEL goes off and its back to normal so i dont really know what else i would do?
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Old 09-26-2011, 07:45 AM   #5
mackeymx
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Go buy a tiny OBDII reader, they can be offed for as low as 40$ at some stores. Just because the code dissapeared, theres a chance it will show up as a pending code, especially since it keeps coming and going. Sounds to me like a misfire if the car is ideling rough. Throw some plugs in and see what happens, but your first invested should be a scanner.
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Old 09-26-2011, 08:04 AM   #6
moonrider_99
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I bet he is overboosting or knocking.
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Old 09-26-2011, 05:04 PM   #7
Subarusesh
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i went got the OBDII and it reads code P0303...Cylinder misfire? what should i do now?

Last edited by Subarusesh; 09-26-2011 at 05:12 PM.
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Old 09-26-2011, 05:12 PM   #8
Paidfor
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^^^^^^^^^Diag the misfire.......Its either fuel(lack of or too much),possible injector fault, Ign(no spark, plug, coil or connections), Cam timing is incorrect, valves not fully seating or bent, Or lack of compression. Id start with pullin the plugs, read them, swap plug depending on what cond its in, swap coil if plug appears to be fuel soaked. Check leakdown and compression after plug insp.
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Old 09-26-2011, 10:14 PM   #9
Yoshisakan
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Make sure that your plugs are not fouling, and are gapped properly.
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Old 09-27-2011, 12:26 AM   #10
RexWagonWA
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Default Running Rough

Has this motor been tuned? Who did it?

Maybe it has been never tuned and that would explain it running rough?

Hearing about your driving, a good tune would help. There are a number of things to fix prior to the tune.
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Old 09-27-2011, 01:03 PM   #11
Subarusesh
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[quote=RexWagonWA;35216300]Has this motor been tuned? Who did it?

Maybe it has been never tuned and that would explain it running rough?

Hearing about your driving, a good tune would help. There are a number of things to fix prior to the tune.[/QUOTE

tuned on a mustang dyno cmon now what do you think i mean by "reputable shop"? that they don't dyno the car after they build the motor and have it broken in properly?
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Old 09-27-2011, 11:58 PM   #12
atomicfire
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Do you have a very light flywheel? That can cause misfire codes as well, but not so much on the newer models. It was usually more of a problem on the 16bit ecu's, which you do not have.

You need to find a local tuner and have them go over the car if you are not mechanically inclined or motivated.
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Old 09-28-2011, 02:51 PM   #13
cemmett
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Are you getting the flashing Cruise light as well?
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Old 09-30-2011, 12:16 PM   #14
Subarusesh
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yes i am
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Old 11-21-2012, 09:52 PM   #15
babaganush
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did you ever find the problem?
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Old 11-22-2012, 03:21 AM   #16
drewvdw
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I bet it has something to do with the fuel quality after sitting test long.
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