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Old 11-06-2012, 09:57 AM   #1
grabera7
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Default 2011 Sti P0172

Here is a list of all the modifications I have on the STI so far. Car was tuned by Jorge at IAG (Westminster, MD).

Accessport
Invidia catless downpipe
Invidia Q300 exhaust
AEM Cold Air Intake
Deatschwerks Top Feed 1000cc Fuel Injectors
Deatschwerks 65C fuel pump
Grimmspeed Electronic Boost Control Solenoid 3-port
Grimmspeed Air/Oil Separator
PERRIN Black Turbo Inlet Hose 3"
PERRIN parallel fuel rails
BLOUCH 20G-XT-R Full Ball Bearing Turbocharger 8cm outlet 3 inch inlet
IAG Performance Subaru External Wastegate Uppipe Kit with TiAL 44mm V-Band Wastegate & GTSpec GEN II style Header
IAG air pump delete
AMR TMIC
Older STI fuel pressure regulator swap


It seems the power band isn't very smooth and I get a P0172 whenever I go on a long drive. Anything over 80 miles I usually get the P0172 CEL. Sometimes it doesn't happen. It happens more consistently if I drive around in Intelligent Drive. I threw a P0244 recently while driving in Sport Sharp mode. That has only happened one time.

When I called IAG they said it might be one of my injectors stuck in the open position.

Anyone have any ideas on what I should do? New tune?

Thanks!

Anthony
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Old 11-06-2012, 10:38 AM   #2
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172 is normally caused by a mis scaled intake or injectors. Less often a small boost leak.

Since you have an AP post up your AF Learning values (there are 4) this will help pinpoint the issue.

Wicked M@
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Old 11-06-2012, 11:28 AM   #3
grabera7
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1a 4.1%

1b -0.6%

1c -23.5%

1d -22.5%

1 -23.4%

Anthony
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Old 11-06-2012, 12:09 PM   #4
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http://www.obd-codes.com/p0172

found this online. maybe give u a better idea
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Old 11-06-2012, 12:36 PM   #5
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interesting. so the idle trim is fine, but the cruising trim is way off and taking out a ton of fuel. it is not a stuck injector thats for sure.

if its pulling out 23 percent in the d range, thats also affecting all your open loop driving so be very careful, i wouldn't drive it hard at all.

Im leaning towards a problem with the calibration.
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Old 11-06-2012, 02:49 PM   #6
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Quote:
Originally Posted by Wicked Innovation View Post
interesting. so the idle trim is fine, but the cruising trim is way off and taking out a ton of fuel. it is not a stuck injector thats for sure.

if its pulling out 23 percent in the d range, thats also affecting all your open loop driving so be very careful, i wouldn't drive it hard at all.

Im leaning towards a problem with the calibration.
What do you recommend I do? Should I ask to have my car re-tuned?

Anthony
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Old 11-06-2012, 05:09 PM   #7
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I would suggest having your tuner look at it and diagnose the problem, without seeing the map I cant give you solid technical advise.

I normally blame the calibration last, but its the most common cause of 172 codes. The only other possibility is a small boost leak that DOESNT manifest as a vacuum leak. Does it hit and hold boost target? Is the idle vacuum normal?
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Old 11-06-2012, 11:07 PM   #8
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It hits boost target (or above) and holds fine. As far as I know. I can do a data log.

The idle seems fine. No surges.
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Old 11-15-2012, 12:55 PM   #9
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Just wanted to jump in here -- Obviously as mentioned in our previous conversations, we would be happy to check this out for you. That being said, we've seen 4 out of the 5 sets of the DW top feed 1000's have this same issue... So I'd put my money on that being the case. We'd be happy to check in to it any time... Just let me know!

Rick
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Old 11-16-2012, 01:03 PM   #10
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Quote:
Originally Posted by Wicked Innovation View Post
172 is normally caused by a mis scaled intake or injectors. Less often a small boost leak.

Since you have an AP post up your AF Learning values (there are 4) this will help pinpoint the issue.

Wicked M@
This. I have top feed DW 1000's and they were mis-scaled. And I had surging once and a while, after some re-scaling car runs like a champ.

Last edited by sexyyrex; 11-16-2012 at 01:09 PM.
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Old 11-18-2012, 10:57 PM   #11
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Quote:
Originally Posted by IAG Performance View Post
Just wanted to jump in here -- Obviously as mentioned in our previous conversations, we would be happy to check this out for you. That being said, we've seen 4 out of the 5 sets of the DW top feed 1000's have this same issue... So I'd put my money on that being the case. We'd be happy to check in to it any time... Just let me know!

Rick
Rick,

That's well and fine, and I trust your opinion. But, it's not your money.. I don't want to shell out $1000 to replace brand new injectors with other brand new injectors...
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Old 11-18-2012, 10:57 PM   #12
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Originally Posted by sexyyrex View Post
This. I have top feed DW 1000's and they were mis-scaled. And I had surging once and a while, after some re-scaling car runs like a champ.
Can you give me more information on this? What kinds of things did you experience?
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Old 11-19-2012, 10:33 AM   #13
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Can you give me more information on this? What kinds of things did you experience?
Surging, almost stalling, sounds like mine was more mis-scaled then yours because it would do it a lot more often then just a long ride. anytime i was on the highway for a prolonged amount of time, 15-20 min, it would do it.

Car felt sluggish and lazy. I was also running e85, met up with my tuner. Re-scaled the intake and injectors and all was good. I think my car was tuned with an intake leak or boost leak. When I found the leak and fixed it, thats when this started happening.
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Old 11-19-2012, 10:40 AM   #14
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Okay. Did it resist sometimes when you accelerated under ~30-50% load?
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Old 11-19-2012, 11:30 AM   #15
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Okay. Did it resist sometimes when you accelerated under ~30-50% load?
under or at 3k rpm?
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Old 11-19-2012, 11:38 AM   #16
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Yep, right at 3k rpm
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Old 11-21-2012, 11:23 AM   #17
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Yep, right at 3k rpm
This is just because of your stock fuel dampeners and larger injector combination. 08+ they changed the supply and return fuel system. IA sells a kit that reverts back to the 04-07 fuel supply and return system. With tuning, this "hesitation" goes away. I've heard that the FIC 1000's or ID 1000's tune out better then the DW injectors though. My hesitation is gone but I also run e85 on the stock fuel dampeners. The code is not related to this hesitation.

http://www.iaperformance.com/product...oducts_id=3155

Last edited by sexyyrex; 11-21-2012 at 11:30 AM.
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Old 11-21-2012, 06:14 PM   #18
grabera7
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I already have the 04-07 fuel setup. This sucks.
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Old 11-22-2012, 01:45 PM   #19
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I already have the 04-07 fuel setup. This sucks.
Well, definitely sounds like a calibration issue. Your tuner doesn't know how to tune the 08+ or he's over looking something. 99% of the cars with the 04-07 fuel setup, this studder is corrected with little tuning. This, with your CEL makes me believe it is most definitely a calibration issue.
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Old 11-25-2012, 10:12 PM   #20
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Quote:
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Your tuner doesn't know how to tune the 08+ or he's over looking something.
Definitely not the tuner, Jorge is on point with all his tunes and is one of the best out there. From the reading I have done, it does sound like a bad batch of DW's as this apparently is not the first time this has happened. Or it could be the driver
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Old 11-25-2012, 10:17 PM   #21
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Definitely not the tuner, Jorge is on point with all his tunes and is one of the best out there. From the reading I have done, it does sound like a bad batch of DW's as this apparently is not the first time this has happened. Or it could be the driver
Where did you do this reading?
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Old 11-25-2012, 10:33 PM   #22
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Reading here on NASIOC
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Old 11-26-2012, 12:41 PM   #23
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Originally Posted by WRXSteye20008 View Post
Definitely not the tuner, Jorge is on point with all his tunes and is one of the best out there. From the reading I have done, it does sound like a bad batch of DW's as this apparently is not the first time this has happened. Or it could be the driver
Everyone makes mistakes. Yes, im sure the driver caused a p0172 code, that must be it.

Quote:
Originally Posted by WRXSteye20008 View Post
Reading here on NASIOC
Get your injectors bench tested before jumping to any conclusions.

Last edited by sexyyrex; 11-26-2012 at 12:46 PM.
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Old 11-27-2012, 04:17 PM   #24
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Everyone makes mistakes. Yes, im sure the driver caused a p0172 code, that must be it.
The OP and I are good friends, it's called joking around
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Old 11-27-2012, 06:22 PM   #25
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I did some datalogs. Would anyone care to look at them?
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