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Old 01-10-2013, 12:09 AM   #1
momoscoobiedoo
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Default 2012 sti wont boost over 8.1psi now

Alright guys im desperate here. This is my 3rd subaru so im not too much of a stranger to our cars but i just dont know whats wrong. i installed my list of goodies
when the time came to button everything back it seems that all the vacuum lines are connected and all the electrical connecters are in the right spot but i have a very rough idle and misfires on cylinder 1 and 3 mainly 3, the car drives normalish, until its time for boost i spool from 2-8 lbs instantly and the most destructive back fires occur and the car will just not go into boost past that point.when the waste gate should be working. it reads 0 WGD so i check the ebcs and yes its been tuned for and double checked installation all my vacuum lines are on tight. im at a loss for words my next step is to simply take my car to COBB and hope the Car gods are kind.
i switched spark plugs and injectors from 3-1 and 1-3 need to get on a laptop and check logs but all the proper scaling and latency's have been done for injectors i even thought the pintle might be stuck but to no avail. my next step if the misfire didnt move from 3 to 1 will be switching coil packs. bank 2 is completely normal according to all logs

PLEASE any input to getting my car back on the road and the track would be greatly appreciated.

here is a list of parts i installed

ID 1000's
Motive autowerks composite TGV's
BOOMBA FUEL rails
Equal length fuel lines
AEM FPR
1 step colder NGK IRIDIUMs
COBB EBCS
APS 3 inch TURBO inlet
AEM CAI
GRIMM speed 8MM Phenolic spacer

so thats almost everything i can think of that i installed, my friend is a tuner and has been tuning my car for some time now as well as most subaru's in the san diego area.
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Last edited by momoscoobiedoo; 01-10-2013 at 12:15 AM.
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Old 01-10-2013, 12:49 AM   #2
1slo3g
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Did you disconnect both quick release fittings for the fuelb rails at the same time? They may have been reversed.Have a friend that just went through a similar issue. Worth a quick check, unless you KNOW the were done one at a time.

Last edited by 1slo3g; 01-10-2013 at 12:56 AM.
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Old 01-10-2013, 01:09 AM   #3
momoscoobiedoo
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they where done one at a time. those are no longer there nothing from the stock fuel system exists anymore besides return and feed from the firewall.
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Old 01-10-2013, 11:30 AM   #4
bmx045
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lets get this straight, you were tuned previous to the mods, and now you installed the mods and are having this issue? or was it fine after you installed, got tuned, and now have the issue? misfires are pretty simple. do you have the FPR hooked up right and adjusted correctly?

1. spark
2. fuel
3. air
4. compression
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Old 01-10-2013, 01:21 PM   #5
momoscoobiedoo
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I was tuned on my turbo back and headers/stg2 car ran fine.
Installed all parts above and now it's scaled for basic operation but I have my driven my car in two weeks because of these problems I at first thougt the injector was stuck open and when the car started to make boost the extra fuel was putting the spark out I will know more once I log later tonight as the car sits it has 85xx miles on it. so its farely new. and plugs are brand new.

Last edited by momoscoobiedoo; 01-10-2013 at 01:41 PM.
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Old 01-10-2013, 02:45 PM   #6
Leafy
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Tune issue for one thing. Also you are on wastegate pressure only so either you didn't plug the electrical connector into the boost control solenoid or the car is in limp home mode. But it doesnt sound like the car has run long enough to get into limp home mode, unless you have come CELs. I THINK but am not certain that TGV delete without getting all the codes disabled will do this.

Also possible that your FPR is set wrong, you didnt say what you set your base pressure to.
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Old 01-10-2013, 02:48 PM   #7
bmx045
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"scaled for basic operation". this could very well mean wastegate boost. get your laptop out and check a learning view, fuel trims and IAM would be of help
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Old 01-10-2013, 03:22 PM   #8
momoscoobiedoo
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Everything is being monitored fuel pressure is set at 43.5 psi injectors scaler came out to 2637 I believe. My tuner lives next door to me so I don't think tuning is an issue my connectors are all connected even going to the ebcs I was planning on maybe removing the ebcs and retuning for just bc? Or slap my mbc on? All tgv codes have been disabled. My CELS are misfire 1 3 and general misfire codes car has a rough idle and a heavy stutter on take off. Thanks for all your inputs guys
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Old 01-10-2013, 03:27 PM   #9
bmx045
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do not put an mbc on and force the car boost. there's a reason you're not boosting, my guess is your IAM is 0.625 or lower causing the ecu to cut boost (and no, you won't get a CEL for this).

pull up a learning view. now. then we'll move on. like i said before, misfires aren't difficult to diagnose...check the things i told you to
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Old 01-10-2013, 04:29 PM   #10
momoscoobiedoo
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ill give it a shot tonight. and maybe post a log. whats IAM? would that also cause the rough idle to happen?
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Old 01-10-2013, 04:35 PM   #11
momoscoobiedoo
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is IAM? what DAM is to accessport? my DAM is at 1.0
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Old 01-10-2013, 06:09 PM   #12
bmx045
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oh, well that's good. iam is dam in cobb world.
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Old 01-11-2013, 10:17 AM   #13
momoscoobiedoo
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Didn't get a log or tune last night but drove the car... Still rough as sand paper idle stuttering and no boost but. No CeL?
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Old 01-11-2013, 10:40 PM   #14
AuthenticAMD
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If you keep driving it you could blow it up. Find out the current state of the car as recommended by others.
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Old 01-12-2013, 12:21 AM   #15
momoscoobiedoo
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Nothing thus far recommended has worked. Logged tonight cracked out the lap misfires stayed the same. Still only bank 1 that's misfiring no idea why. The idle is still funy so I tried raising it still idles ****ty but then when I held my foot at 1k where I had raised the idle too it was normal. Tomorrow ill be ripping the entire thing apart again in hopes of finding the solution. Has anyone ever encountered this problem before misfire during idle and can't boost. Around town it's fine. I highly doubt it has to do with compression since there was zero problem with the car before install and it has been driven about 35-50 miles since then but idled a lot. Tried tuning it out no go.
My last resort is to drive my car to Cobb
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Old 01-12-2013, 12:53 AM   #16
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Rough idle may indicate an air leak. This will also prevent you from boosting. Find a place that can smoke if for you.
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Old 01-12-2013, 07:22 PM   #17
momoscoobiedoo
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Switched injectors and also found my amr reducer to be a little loose. So tomorrow will be test and tune
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Old 01-14-2013, 03:13 PM   #18
momoscoobiedoo
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I'm stumped still a misfire after switching injectors and gapping plugs to .026 for a better spark. Car still won't boost and sounds like a chainsaw if I try and force it
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Old 01-20-2013, 06:59 PM   #19
momoscoobiedoo
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So I found my issue. My composite tgv's are not allowing enough voltages to flow for my Injectors to cycle I figured this put by gapping the plugs closer and noticed my idle smoothed out and my boost went up but I still have problems so I ran a ground from the battery terminal to a chasis ground to my block since I no longer use the stock ground location. Boost went up again.. But not enough so going to tie in another ground directly to the harness
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Old 01-20-2013, 11:08 PM   #20
Dedicated-matt
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Wow really? What is the tgv and why does it effect battery voltage supplied to the injectors?

Matt
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Old 01-21-2013, 12:51 PM   #21
Clark Turner
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Scaling of 2637 is incorrect for ID1000 injectors. Just FYI.

C
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Old 01-22-2013, 09:06 PM   #22
momoscoobiedoo
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Figured that's what cobbs notes say as well as wht bill from Cobb was quoted on other forums. It was my fault I didn't ground the harness to a tgv bolt to the heads I moved the ground to the block by the headers.
What is the proper scaling it would be cool if you could say what it is
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