Username or Email Address
Do you already have an account?
Forgot your password?
  • Log in or Sign up

    VWVortex


    Page 1 of 5 12345 LastLast
    Results 1 to 25 of 114

    Thread: 1.8t AWP weird "lagging / surge / stutter" boost / throttle feel ?

    1. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-25-2012 04:52 PM #1
      Wondering if anyone has any experience with 1.8t boost fluctuation, and might be able to point me in a direction for fixing the symptom. Any advice is much appreciated. The problem as I can best describe:

      Car: 2003 Anniv GTI - AWP - bought new - ALWAYS 93 octane, ALWAYS synthetic (not that I think that's related).

      The symptom first appeared maybe a year or so ago and would only appear rarely (once a month maybe), and usually only when the car was warming up and driving out first thing of the day. When I would pull out in 1st gear, giving it a little throttle, when I would let off the pedal a hair I would feel an ABRUPT drop in deceleration just for a second. Like the boost disappeared for a moment. Where the car normally just smoothly backs off / slows down.

      It happened so rarely and was so minor, I didn't pay it much mind.

      The other day I decided to flash with car with a 93 APR map (finally, at 95k. Don't ask )

      Now, that same symptom described above, can be felt more regularly, and can almost be created upon request: If I'm in say 3rd gear at maybe 2000 to 2500 rpm, then put the pedal down maybe 3/4 to build some decent boost, when I let off a hair, but hold the pedal and remain in gear, I can feel a weird stutter or abrupt momentary drop in what I'm perceiving as boost pressure. In other words, it seems to be the same issue I was previously only having on rare cold/startup situations.
      Maybe the higher boost and or increased ignition timing is bringing the issue more to light?

      The DV was replaced a while ago with the better 228 TT DV, and is holding vacuum fine.

      - Someone suggested maybe it's misfires, and maybe start by changing the plugs.

      - Anyone have any insights, or has seem this issue in these motors before?

      Many thanks in advance!

    2. Member
      Join Date
      Mar 8th, 2012
      Location
      NW Louisiana
      Posts
      272
      Vehicles
      2004 Jetta 1.8T
      09-25-2012 04:54 PM #2
      Sounds like a boost leak to me, there's a guide for finding them on the 1.8t forums.
      All the war-propaganda, all the screaming and lies and hatred, comes invariably from people who are not fighting.

    3. Member Sickvwguy's Avatar
      Join Date
      Apr 12th, 2011
      Location
      High Desert
      Posts
      250
      Vehicles
      03' GTI BMP, 97 TDI Passat, 85 Mk2 Jetta diesel, 69 vw bug, 58 dbl. cab
      09-25-2012 05:00 PM #3
      could be the N75. I had a surging issue and replaced it and boom no more surge. Do you have a boost gauge?

    4. 09-25-2012 05:11 PM #4
      i bought my 02 gti about a month ago. that used to happen but aggressively.... i would give it gas and it seemed like the car would die for a fraction of a second when the boost would start kicking in then it would start picking up again..... i kept driving it like that always on 91 and it went away a considerable amount.... now i could only feel it a little bit and and not as frequent.
      oh yea i also seafoamed it and it helped out too

    5. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-25-2012 05:17 PM #5
      Thanks for the quick replies guys.

      - I don't have a boost gauge in the car.

      - I'll do a search for boost leak

      - seafoam?!

    6. Member Alcrerion's Avatar
      Join Date
      Feb 16th, 2012
      Location
      408
      Posts
      597
      Vehicles
      2002 Silver Girl Car, 2002 Red AWD Rocket Car.
      09-25-2012 05:25 PM #6

    7. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-25-2012 05:36 PM #7
      thanks.

      805: Did you spray a can into the throttle body, dump some into the gas tank, or something else? Any idea which product you used?
      TIA.

    8. Member
      Join Date
      Feb 8th, 2012
      Location
      Chicago
      Posts
      110
      Vehicles
      2004 GTI
      09-26-2012 01:00 AM #8
      Call the dealership and give them your VIN. Ask to check if your car got the coil packs changed during the recall in 07. I bought my car last year and had the same problem. They will replace it for free

    9. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-26-2012 08:08 AM #9
      Thanks for the coils suggestion. I should have mentioned that new coils went in maybe 6 months ago.

      Anytime I have a coil issue, it was serious. Like the car was literally running on 3 cylinders and you knew something was really not working right.

      The issue I'm experiencing now is MUCH more subtle. I think the guys who are recommending a boost leak or maybe N75 issue may be on to something. I'll update.

    10. Member MrSavvy's Avatar
      Join Date
      Mar 21st, 2011
      Location
      Augusta, GA
      Posts
      4,161
      Vehicles
      '03 1.8t GTI -R.I.P.
      09-26-2012 08:57 AM #10
      Quote Originally Posted by Sickvwguy View Post
      could be the N75. I had a surging issue and replaced it and boom no more surge. Do you have a boost gauge?
      I don't have a tune but I do have these sputtering and odd boost issues. I replaced my MAF last week, and it helped reduce the problem, but it definitely still plagues my GTI (1.8t AWP). I'll be replacing the n75 on mine as well.
      I'm hoping that's all it is.
      ~TheGreatCatTakeover2012~Dat build thread doe~Lace up~
      Forge 007, GHL 3" TB, EuroJet TIP, drive/pass Raxles, ECS Hybrid Oil pan, Samco coolant hoses, P-flo SRI, VR6 Lightweight single mass clutch, Ultimo's, etc. -Sold n gone-

    11. Member Sickvwguy's Avatar
      Join Date
      Apr 12th, 2011
      Location
      High Desert
      Posts
      250
      Vehicles
      03' GTI BMP, 97 TDI Passat, 85 Mk2 Jetta diesel, 69 vw bug, 58 dbl. cab
      09-27-2012 01:47 PM #11
      Just replace it with a stock N75 and you should be golden.. No tune yet for me either..I don't think anyways lol it holds 12psi. I bought the car used and have no idea if it has any software on it..I can tell you the short ram intake, 2.5" turbo back,the high flow exhaust manifold, and FMIC make a pretty significant change in power. Can't wait for frankenturbo


      Sent from my throne using Crapatalk

    12. 09-27-2012 01:56 PM #12
      0. boost leak
      1. spark plugs
      2. coil packs
      3. O2 sensor [bank 1]



      I had the same symptoms for quite some time and it ended up being the bank 1 O2 sensor, AFTER I had replaced all of the above.
      Mk6 Jetta Sportwagen 2.5l (daily)
      Mk1 1979 Scirocco Special Edition 5-Speed (resto project)
      Mk6 Golf TDI (sold)
      Mk4 Jetta GLI (parted)
      Old build

    13. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-27-2012 02:36 PM #13
      Dude.. very nice timelapse video. What do you charge per hour to do work that fast?

      I'll add the O2 sensor to the list of possibilities. Thank you.

      Any chance you can identify the part for me, or where it's located? Couldn't find anything on search.

    14. 09-27-2012 02:50 PM #14
      Quote Originally Posted by AEGTI3913 View Post
      Dude.. very nice timelapse video. What do you charge per hour to do work that fast?

      I'll add the O2 sensor to the list of possibilities. Thank you.

      Any chance you can identify the part for me, or where it's located? Couldn't find anything on search.
      Thanks dude, I charge double for work that fast.

      It's in a sneaky spot on top of the downpipe just before the catalytic converter. You can get to it from underneath the car pretty easily. Check this link out: http://euroturbo.net/guide-on-downpi...t-20v-engines/
      Mk6 Jetta Sportwagen 2.5l (daily)
      Mk1 1979 Scirocco Special Edition 5-Speed (resto project)
      Mk6 Golf TDI (sold)
      Mk4 Jetta GLI (parted)
      Old build

    15. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-27-2012 03:05 PM #15
      So I'm guessing in this image:
      http://euroturbo.net/wp-content/uplo..._oem_stock.jpg

      The two holes showing just before and after the cat are for the O2 sensors? The one closer to the turbo is bank 1, and the one closer to the exhaust is bank 2?

    16. 09-27-2012 03:29 PM #16
      Quote Originally Posted by AEGTI3913 View Post
      So I'm guessing in this image:
      http://euroturbo.net/wp-content/uplo..._oem_stock.jpg

      The two holes showing just before and after the cat are for the O2 sensors? The one closer to the turbo is bank 1, and the one closer to the exhaust is bank 2?
      Exactly!
      Mk6 Jetta Sportwagen 2.5l (daily)
      Mk1 1979 Scirocco Special Edition 5-Speed (resto project)
      Mk6 Golf TDI (sold)
      Mk4 Jetta GLI (parted)
      Old build

    17. Member Fastvolks's Avatar
      Join Date
      Apr 30th, 2003
      Location
      Somewhere Bananas
      Posts
      5,302
      Vehicles
      MK4 & MK6 GTI • 1986 Audi 4000CS Quattro
      09-27-2012 03:40 PM #17
      I would definitely check the plugs I had a similar issue and two of my plugs were not gapped properly which can happen over time with old plugs. Also if you recently got flashed I would replace those plugs for sure and make sure they are gapped for your setup.

    18. 09-27-2012 03:52 PM #18
      I sold my 1.8T and picked up a 24v for this very same reason. Acceleration is now so gd smoooooooth.

    19. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-27-2012 04:21 PM #19
      Subisan: Thank you!

      Fastvolks: It's on my list for sure. Short money in my book for something I should do even if it's not related to the issue. Any suggestions on how to find the right gaps for my car? I've got a '03 Aniv. GTI (1.8t AWP) with an APR 93 oct flash.

      Dauz: Thanks for the suggestion. I'm a bit attached to this one and like the lighter motor for handling on (and off) the track.

    20. Member Fastvolks's Avatar
      Join Date
      Apr 30th, 2003
      Location
      Somewhere Bananas
      Posts
      5,302
      Vehicles
      MK4 & MK6 GTI • 1986 Audi 4000CS Quattro
      09-27-2012 04:23 PM #20
      Quote Originally Posted by AEGTI3913 View Post

      Fastvolks: It's on my list for sure. Short money in my book for something I should do even if it's not related to the issue. Any suggestions on how to find the right gaps for my car? I've got a '03 Aniv. GTI (1.8t AWP) with an APR 93 oct flash.
      .028

    21. Member AEGTI3913's Avatar
      Join Date
      May 13th, 2010
      Location
      New England
      Posts
      131
      Vehicles
      03/20th AE GTI/BMP
      09-27-2012 04:36 PM #21
      Thanks Fastvolks. I did some searching and looks like stock plugs are aok (as opposed to NGKs) if the car is otherwise stock. So I'll be grabbing some stock plugs and gapping to .028 Thanks

    22. 09-27-2012 08:17 PM #22
      Quote Originally Posted by AEGTI3913 View Post
      Dauz: Thanks for the suggestion. I'm a bit attached to this one and like the lighter motor for handling on (and off) the track.
      No worries. I do have to let you know that I've fought this battle on many fronts and lost. Pretty much did everything that was suggested and then some and still couldn't be rid of the stutter 100%. So I thought it'd be best to pull the plug before I lose any more sleep over it. I did have an '05 GTI with the AWP.

    23. Member corradoproblem's Avatar
      Join Date
      Oct 26th, 2005
      Location
      Killingworth, CT
      Posts
      136
      Vehicles
      2003 VW GTI 20th Imola Yellow
      09-27-2012 08:49 PM #23
      I will say that the coils can cause this, and did for me, with no cel and only under load/boost. But I will also say my own car has has a long history with this type of issue in varying severities over the years. It could be a boost leak yes, but is it boosting full when WOT? Do you have a boost gauge? Is the vacuum good? My issues are with part throttle and most would point you to the N75 if that's the case.

      Another time I had issues like this it was the start of the exhaust manifold and turbo housing cracking. It started as fluctuations in boost and eventually turned into a total lack of boost.

      Fixing all of of that stuff has made my car run quite well, however, I still have a lack of smoothness with part throttle and I am convinced it is a byproduct of the chip tune.

    24. Member Slimjimmn's Avatar
      Join Date
      Apr 8th, 2006
      Location
      Rochester, MN
      Posts
      10,352
      Vehicles
      MK4 shaggin wagon
      09-27-2012 10:25 PM #24
      the car is on an inclined driveway and up on jack stands in the front only
      04 Jetta Wagon 2.slow------>Family man now

    25. 09-27-2012 10:50 PM #25
      Quote Originally Posted by AEGTI3913 View Post
      thanks.

      805: Did you spray a can into the throttle body, dump some into the gas tank, or something else? Any idea which product you used?
      TIA.
      yea i used seafoam.... i put half in the tank and half of it through the vacuum line lgoing into the intake manifold...... you could also put a third into the tank a third into the crankcase and a third through the vacuum line, but make sure to change your oil afterwards if ur going to out some into the oil...... it helped out A LOT!!! me nd my brother did it to his cobra and it made a huuuuge difference..... i also cleaned the maf sensor with maf sensor cleaner
      huge improvement than when i first bought it

    Page 1 of 5 12345 LastLast

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •