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08-10-2022, 05:46 PM | #1 |
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Car won't rev past 3.5k rpm
I have a 2004 STI with an EJ20x swap that I did not do myself.
The car has a Blouch TD05H-16gxt turbo, TGV deletes, catless up-pipe and downpipe, fuel pump hardwire, Tomei uel headers, front mount intercooler, hks bov, and an old protune on a v2 accessport. The car ran extremely well for about a year until a few weeks ago where the car seemed to stop revving past about 3.5k rpm. The car runs rich but it still idles fine and drives fine until the turbo starts to kick in, then the car hits 11.1 afr immediately and hits a wall around 3500 and starts sputtering and popping. I brought the car to BrenTuning after trying to figure it out myself and they couldn't find what was causing the issue. They found no boost leaks, the MAF sensor is fine, and I replaced the o2 sensor to no avail. Does not occur in neutral, car will revs freely albeit a bit rich. The symptoms are extremely similar to those described in this post from a while ago, but I never changed the injectors to anything else. https://forums.nasioc.com/forums/sho....php?t=1083133 Thank you in advance for the help.
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08-10-2022, 09:38 PM | #2 |
Scooby Specialist
Member#: 110078
Join Date: Mar 2006
Location: Long Island N.Y.
Vehicle:02 Bugeye JDM STi OBP BLACK |
How new are the coil packs?
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08-10-2022, 09:52 PM | #3 |
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08-11-2022, 05:41 PM | #4 |
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Car has 2 CELs; p0172 and p0230 from the fuel pump
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08-11-2022, 10:28 PM | #5 |
Scooby Specialist
Member#: 110078
Join Date: Mar 2006
Location: Long Island N.Y.
Vehicle:02 Bugeye JDM STi OBP BLACK |
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08-11-2022, 11:12 PM | #6 |
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08-12-2022, 12:39 AM | #7 |
Scooby Specialist
Member#: 110078
Join Date: Mar 2006
Location: Long Island N.Y.
Vehicle:02 Bugeye JDM STi OBP BLACK |
Search.
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08-12-2022, 10:54 AM | #8 | |
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Member#: 30804
Join Date: Dec 2002
Chapter/Region:
SWIC
Vehicle:87 Yugo Red |
Quote:
Start the car and take a look at the crank pulley. See if it's wobbling. If it is the pull the pulley off and see if the snout of the crank looks a little off center. If it is pull the timing and see if the crank will then wobble a bit by hand. I really hope this is not the case for you. |
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08-12-2022, 02:36 PM | #9 | |
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Quote:
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08-12-2022, 02:38 PM | #10 |
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Does anyone know if a failing fuel pressure regulator would cause this?
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08-13-2022, 11:36 AM | #11 |
Scooby Specialist
Member#: 110078
Join Date: Mar 2006
Location: Long Island N.Y.
Vehicle:02 Bugeye JDM STi OBP BLACK |
I know from experience weak spark from old coil packs will do that.
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08-14-2022, 10:27 AM | #12 |
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I checked out my coil packs, I'm not able to properly test them without a tester, however, I did notice that the one that was replaced was numbered fk0334, while the rest were fk0186. This never gave me any issues, but if I were to go and replace the rest of them would it be best to use fk0334 or fk0186 coils?
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08-14-2022, 12:56 PM | #13 |
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Join Date: Feb 2011
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MAIC
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coils should match
you should use the coils for your ecu i have set of 04 sti coils with about 35k on them pm me if interested and maybe new plugs |
08-14-2022, 01:29 PM | #14 |
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08-20-2022, 06:40 PM | #15 |
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The coil packs did not change anything. Neither did a fuel pressure regulator.
Does anyone have any ideas? |
08-21-2022, 08:24 PM | #16 |
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Join Date: Mar 2006
Location: Long Island N.Y.
Vehicle:02 Bugeye JDM STi OBP BLACK |
Car won't rev past 3.5k rpm
https://www.carparts.com/blog/p0172-...o-rich-bank-1/
https://www.carparts.com/blog/p0230-...imary-circuit/ Sent from my iPhone using NASIOC |
09-26-2022, 01:19 PM | #17 |
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Problem solved!
It ended up being faulty wiring between the ecu and the maf sensor. After messing with it while doing some more in depth diagnosis the connection was improved and the problem resolved itself |
09-26-2022, 03:02 PM | #18 |
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Member#: 515308
Join Date: Jun 2020
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Also…2020 black coils are the same as the 04, same dwell map. So grab a set of low mile take offs when they come avail.
Also seen another cause to this, stripped tab on crank timing pulley, was non interference so took a min to figure out, would not start, then catch and run, then go out of time. As an experience |
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