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2000 GDB Sti stuttering issues
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Old 06 Sep 2016, 10:10 PM   #1 (permalink)
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2000 GDB Sti stuttering issues

Hey guys,

I am new to this forum, new to the Subaru cult.....er i mean community, and it is my first boosted car.

Recently I have noticed a stutter that is slowly getting worse. So far everything is pointing to an exhaust leak somewhere before the front 02 sensor. Here is what I have found/noticed:
  • stuttering worsens >1/4 throttle, in boost, uphill, >3rd gear
  • drop in fuel millage
  • seafomed engine and noticed white smoke in engine bay, but couldn't pinpoint where
  • boost guage reads good vac and no boost fluctuation
  • brand new downpipe gasket (replaced when i did the clutch 6000kms ago)
  • cleaned maf sensor, no changes

Has anyone had similar issues, or perhaps a better insight? What would be the best way to test / locate a leak? I appreciate any and all help.

Here is my car,
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. I imported it earlier this year. 2000 Subaru Wrx Sti v7. Currently has 72,000kms. Mods it came with : HKS intake, HKS down pipe (cat) and mid pipe, Jasma Muffler, Apexi Boost guage, and a non functional HKS EVC5. I put in a ACT street performance clutch kit, and ACT street light flywheel.
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Old 07 Sep 2016, 07:43 AM   #2 (permalink)
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Re: 2000 GDB Sti stuttering issues

First question is always, is the car mapped for the mods ?
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Old 07 Sep 2016, 05:25 PM   #3 (permalink)
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Re: 2000 GDB Sti stuttering issues

I haven't had it tuned since it has been imported. Nor do I know if it was done in Japan after the mods. Since importing, I have been running waste gate pressures, 5 months, with no issues what so ever. Have not had any hiccups until this past week. I am running 94oct + booster to compensate for the 100RON in Japan. Even running it on 91oct I have never experienced any issues.
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Old 12 Sep 2016, 08:43 AM   #4 (permalink)
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Re: 2000 GDB Sti stuttering issues

with the mods you have it is typical for a impreza to need a remap, especially the intake mods as the Maf will want rescaling.
Subaru servicing, repairs and diagnostic fault finding help available.
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