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02-01-2005, 10:41 PM | #1 |
Scooby Newbie
Member#: 73798
Join Date: Nov 2004
Location: brunswick md
Vehicle:2004 subaru wrx sti wr blue |
i got a problem with my 04 sti can anyone help?
i have an 04 sti with a full turboxs exhaust with down pipe and a aem cold air intake.When im excellerating hard 4,5,6 the car falls on its face and throws check engine light with the cruise light blinking!!The light goes off after awhile but comes back on every time im pushing the car al ittle?Does anyone know whats happening and how to fix?Any help would be great!
thanks trevor
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02-01-2005, 10:47 PM | #2 |
Scooby Newbie
Member#: 52569
Join Date: Jan 2004
Vehicle:2004 STi |
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02-01-2005, 10:47 PM | #3 |
Scooby Specialist
Member#: 18308
Join Date: May 2002
Chapter/Region:
NWIC
Location: Seattle, WA
Vehicle:2005 WRX STi Silver |
A little search on 'boost creep' and or 'fuel cut' will give you all you want to know and more - short answer is that you have uncontrolled boost and the ECU is shutting off the fuel to protect the engine.
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02-01-2005, 10:50 PM | #4 |
Scooby Newbie
Member#: 73798
Join Date: Nov 2004
Location: brunswick md
Vehicle:2004 subaru wrx sti wr blue |
how should i fix this?
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02-01-2005, 10:51 PM | #5 |
Scooby Newbie
Member#: 52569
Join Date: Jan 2004
Vehicle:2004 STi |
engine management ie, cobb AP, utec, or port the waste gate. searching will give you a better answer.
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02-01-2005, 10:56 PM | #6 |
Scooby Newbie
Member#: 73798
Join Date: Nov 2004
Location: brunswick md
Vehicle:2004 subaru wrx sti wr blue |
my AM boost gauge reads 21pds at alittle over 5000rpm. everyone ive talked to says boost cut is 18pds. so my gauge must be wrong. am i damaging any thing now?
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02-01-2005, 10:59 PM | #7 |
Scooby Newbie
Member#: 52569
Join Date: Jan 2004
Vehicle:2004 STi |
pds? you mean psi? both are to high for stock em, prolonged overboosting will hurt your engine/turbo.
Last edited by Skeete; 02-01-2005 at 11:11 PM. |
02-01-2005, 11:17 PM | #8 |
Scooby Specialist
Member#: 69343
Join Date: Aug 2004
Chapter/Region:
South East
Location: 'tween Lewisville&Clemmons NC
Vehicle:1998 TransAm cnvrtbl Black |
Fuel cut is set for some given PSI (might be 18) but it is delayed (timewise) to allow for spike circumstances. In that delay you may reach 20+ psi and think that is the cutoff.
Others here are experimenting with different wastegate restrictor diameters to allieviate the issue. A restrictor with a larger hole in it might fix the problem. Again, spend some time with searches here and research similar problems. I don't know all the specifics off hand. I fixed my creep myself by porting. I think there are less drastic manners to resolve the issue though. My turbo was creeping with aftermarket EBCs and the restrictor pill was no longer in the plumbing, so porting seemed the only way to beat it... but all the solutions seem to change from car to car. Some EM systems can fix it by throwing more fuel at specific loads to cool EGTs and reduce pressure. That can work but it's a loss in HP (sometimes) according to some.... like we've said. Lots of reading... Gaining power in an STi tends to be an avalanche. Once you start you can't stop, even if you want to. You set a mild goal and the standard WRX upgrades push you past where you want to be. It'll get expensive in a hurry. EM is almost a given. And then turbo and fuel upgrades get just too tempting. Second Mortage your house and ride the wave baby! It'll be worth it in the end. Or you'll lose your house... |
02-01-2005, 11:41 PM | #9 |
Scooby Newbie
Member#: 73798
Join Date: Nov 2004
Location: brunswick md
Vehicle:2004 subaru wrx sti wr blue |
Thanks for the input im just going to have to buy a utec! After reading it seems to be a real common problem. Cant you just buy a new wastegate instead of porting the stock one? A local speed shop says they can install A $50 sensor that will cure the code problem is that just a wrong diagnosis?
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02-01-2005, 11:58 PM | #10 |
Scooby Specialist
Member#: 59764
Join Date: Apr 2004
Chapter/Region:
South East
Vehicle:10 sec STi 10 sec Z06 |
a utec will help. I have an 04 STi with txs catless tbe, txs intake, and a utec (has not been custom tuned) and I've hit boost creep/fuel cut once, (while racing a 355gts on the highway). It hasn't been a big problem for me and I give my car hell . I'm not sure if the utec will "fix" boost creep, but I think tuning can help cut it down.
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02-02-2005, 08:40 AM | #11 |
Scooby Specialist
Member#: 53573
Join Date: Jan 2004
Chapter/Region:
South East
Location: Sanford, Fl
Vehicle:2005 STi Silver Silver and fun |
I have the same setup as burnin4, but my utec is tuned and I never have boost creep. I am pushing 20psi. Sometimes I wish I had it that way I would not have to watch my psi drop from 20 to 16 will running through the gears.
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02-02-2005, 10:33 AM | #12 |
Scooby Specialist
Member#: 73422
Join Date: Oct 2004
Chapter/Region:
SWIC
Location: Gilbert
Vehicle:04 STi JVP |
Have it scanned find out exactly what it is...have you done the mechanical mod yet?
http://forums.nasioc.com/forums/show....php?t=681693] Sounds like boost creep/spike. I spike up to 19/20psi but it comes down quickly to 17psi w/ my 3" cattless TBE. I have some sort of EM though...so no cel for me. Read this entire thread. If you have no experience with cars...let a professional port the wastegate. http://forums.nasioc.com/forums/show...port+turbo+sti |
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