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    Thread: Dies on deceleration, sputters over 5 psi, help needed..

    1. Member kueckerdj09's Avatar
      Join Date
      Jun 1st, 2011
      Location
      Omaha, NE
      Posts
      2,134
      Vehicles
      20th GTI
      02-15-2014 12:32 AM #1
      I have a unique problem with my GTI that I need some help figuring out. I'm going to check over my vacuum lines tomorrow and boost piping, but something just doesn't add up

      - It won't boost above 5psi without sputtering and backfiring
      - On deceleration it has a tendency to die, I've watched the vacuum drop close to -30 in Hg before it dies.

      The odd thing is this...

      - At idle. vacuum stays between -20 and -21 in Hg.
      - In 4th gear around 45-50, the car will build boost to 20 psi and hold. (on a few rare occasions, it will feel like its sputtering under load but no check engine light or misfire)

      I have the following
      EVAP/SAI Delete (only 3 real vacuum hoses... brake booster, FPR, and DV)
      F21 Frankenturbo
      550cc Injectors
      3" MAF
      Eurojet FMIC
      Eurodyne Software

      I have not touched the software except for the addition of the 2-step option to the base file for my car. Any help or guidance would be appreciated.

    2. Member DMehalko(DM)'s Avatar
      Join Date
      Nov 1st, 2004
      Location
      Colorado
      Posts
      2,763
      Vehicles
      All sorts of VW's
      02-15-2014 04:28 PM #2
      Bad leak somewhere (boost or vacuum)

      Fouling spark plugs (or need a tighter gap)

      Dying coilpacks? (Would probably cause a CEL though)

      Clogged Cat?
      2003 Tornado Red Jetta AWP
      2009 Campanella White Jetta
      2001 GTI VRT (Sold )

    3. Member kueckerdj09's Avatar
      Join Date
      Jun 1st, 2011
      Location
      Omaha, NE
      Posts
      2,134
      Vehicles
      20th GTI
      02-15-2014 09:07 PM #3
      Quote Originally Posted by DMehalko(DM) View Post
      Bad leak somewhere (boost or vacuum)

      Fouling spark plugs (or need a tighter gap)

      Dying coilpacks? (Would probably cause a CEL though)

      Clogged Cat?
      Installed new plugs, gapped to .028"
      New coil packs installed
      Catless Downpipe
      No boost leaks, checked all the piping.
      I found a small leak on the N75 valve.

      It appears to be working right now at this time

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