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

    VWVortex


    Results 1 to 21 of 21

    Thread: Some sudden issues with my 24vT

    1. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      07-24-2012 07:45 PM #1
      Somewhere in between parking the car Sunday night where it was driving completely fine under power, until the next morning, something happened.

      I'm trying to figure it out, but I haven't really had the time to get under the hood or log it. Just to scan the car, so I figured since I can't look at it tonight, i'll post up and see if I can get leads so I don't waste time tomorrow.

      Scan revealed 3 codes. Random misfire, Intermittent Mis-3, Intermittent Mis-6.

      As far as driving, it is completely normal out of boost, idles at 14.7ish, cruising AFR is same as usual, and its not until i get a little heavy with my foot that it acts up.

      It feels like it has no power, and the tone of the car when i get into the throttle tells me it's probably pulling timing.

      MAF/O2?

      Sorry, I know this post doesn't give alot of info...

      Tomorrow I should know some more if I can get to log it and check under hood that nothing is loose or out of place.

    2. Member 24vGTiVR6's Avatar
      Join Date
      Sep 13th, 2010
      Location
      the track
      Posts
      1,280
      Vehicles
      24v VRT
      07-24-2012 11:14 PM #2
      Quote Originally Posted by Lieutenant Dan View Post
      Scan revealed 3 codes. Random misfire, Intermittent Mis-3, Intermittent Mis-6.

      As far as driving, it is completely normal out of boost, idles at 14.7ish, cruising AFR is same as usual, and its not until i get a little heavy with my foot that it acts up.

      It feels like it has no power, and the tone of the car when i get into the throttle tells me it's probably pulling timing.
      I had similar symptoms, except my AFR was all over the place. Turned out to be valves. It sounded like a modded WRX and lacked power. I was running 18psi on a stock motor at the time.

      Seems like VRT's are falling from the sky lately.... ginster, me, you..... good luck dude hope it's nothing crazy.

    3. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      07-24-2012 11:21 PM #3
      car sounds normal, and drives normal out of boost; it's just pulling timing like mad when i step on the throttle causing it to have no power.

      I can't imagine the engine being on its way out. It hasn't ever seen more than 10psi yet and it's at 9:1 compression...I never finished my fuel pump so I couldn't go any higher. Ran a year before that at 7psi on stock compression.

      Started thinking about it a bit tonight, and have a suspicion that it might be related to the DV. I'm running a regular Bosch OEM DV and I'm wondering if the diaphragm inside has ripped and it's looping boost back into the turbo.

      Hopefully I'm right, but we'll find out tomorrow

    4. Member
      Join Date
      Dec 22nd, 2002
      Location
      CT
      Posts
      4,986
      07-25-2012 07:57 PM #4
      How old are the plugs?
      1988 Jetta Carat Vr6 powered by www.LugTronic.com (99.9% done!!! )

    5. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      07-26-2012 02:22 PM #5
      Quote Originally Posted by PjS860ct View Post
      How old are the plugs?
      A year or so, same with coils. I replaced them all.

      Diverter valve checks out. Seems like its intermittent now. I'm wondering if the Jersey fillup before driving home from WF gave me a batch of bad gas.

    6. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-01-2012 02:58 PM #6
      Alright... ran that tank dry, filled it with gas that I know is good, and it still is down on power/pulls ALOT of timing, even at 7psi.

      I haven't logged it, but I did a 3rd gear pull, and looked over at the computer and was seeing CFs of 10+ across the board, so I stopped.

      About to scan it for codes to see if any codes have come back...

      edit: No codes have come back.
      Last edited by DannyLo; 08-01-2012 at 03:11 PM. Reason: added info

    7. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-11-2012 11:41 PM #7
      Ok, some progress. One problem fixed, but another still remains.

      Turns out my DV was leaking boost. I changed it out for a new Forge, and it's infinitely better. I noticed that my old bosch valve wasn't seating properly when closed.

      Now, what remains is a sort of lean condition.

      In boost; this is only 7 psi mind you, I see this:

      2nd gear = 11 - 11.5 AFR
      3rd gear = 12 - low 13 AFR

      Haven't gone any further. Car feels doggy, like it's not happy/pulling timing, etc.

      Also, I'm not sure if it relates to that lean issue or not, but if the car's warm and I try to start it...after going to gym, for example, it doesn't want to start unless I give it throttle. It cranks over and lazily hangs around like 200-500 rpm, and then stalls...unless I blip it properly. If I blip too much, it bogs and stalls. Has to be perfect amount of throttle as it starts to turn over and then it will fully start and idle normally.

      It's not the throttle body. I've checked it, it sits where it should, and has been aligned, and reads normally in VAG-COM. Doesn't change a thing.

      I seem to always have weird gremlins

      Fuel issue?
      Last edited by DannyLo; 08-11-2012 at 11:43 PM.

    8. 08-12-2012 12:35 AM #8
      I've lost count... is this your third dv now?

      Have you cleaned your MAF sensor lately?
      Bumblebee Tuna

    9. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-12-2012 02:14 AM #9
      Quote Originally Posted by DieGTi View Post
      I've lost count... is this your third dv now?

      Have you cleaned your MAF sensor lately?
      Something like that

      And no, I haven't...I guess I could take a stab at that.

    10. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-14-2012 04:05 AM #10
      Some videos about the startup, and lean issue on a cold start.

      In this video, it starts, and hangs around 400rpm for a sec...then suddenly snaps overcompensates idle and then settles down to where idle is set...but lean

      [Sometimes, it will sit at that 400rpm crap for as much as 5-10 seconds before it snaps up, overcompensates and settles down to idle. (You can see that when it's idling around 400, vacuum is not right as well)]



      Then, in this part 2, it will continue to idle lean, at slightly less than ideal vacuum, until it is "warm" where i guess o2 takes over and it goes right back to relatively stoic at idle, with normal vacuum.

      (kind of long, skip to 2:00 to see when it changes)

      Last edited by DannyLo; 08-14-2012 at 04:07 AM.

    11. 08-14-2012 04:07 AM #11
      Do you think perhaps it could be the crank angle sensor is faulty ?

    12. Member spitfire481's Avatar
      Join Date
      Mar 20th, 2007
      Location
      Baltimore Md
      Posts
      8,191
      Vehicles
      04 GTI 24vT, 2013 FR-S
      08-14-2012 11:20 AM #12
      sounds like a maf problem. my buddies 12v vrt was having similar issues at idle (low vacuum, lean, etc). unplugging the maf caused it to idle much better. see what happens with the maf unplugged.

    13. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-15-2012 04:31 AM #13
      Here's some data for you guys, with a video. They are both from the same event. You can basically follow the timestamp on the data with the video once the car starts pretty closely. I graphed a few things against time from startup to end to get a visual.

      I'll link the data, because it's kind of big to directly post:

      http://i158.photobucket.com/albums/t.../ColdStart.jpg

      And the video to go with that data:



      Cheers
      -Dan

    14. 08-15-2012 09:55 AM #14
      Lazy MAF... all day long. That's where my money would be.
      Bumblebee Tuna

    15. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-15-2012 12:48 PM #15
      Quote Originally Posted by DieGTi View Post
      Lazy MAF... all day long. That's where my money would be.
      Even though the MAF readings at idle are within spec?

    16. 08-15-2012 01:02 PM #16
      On the 24v the IAT is built into the MAF sensor... if the sensor outputting hotter than actual then it will trim the fuel lean. Clean is easy to do or if you have a spare to swap in to eliminate the possibility.
      Bumblebee Tuna

    17. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-15-2012 01:16 PM #17
      ahh I didn't even think about IAT. I could do an air temp reading on startup and driving as well, but I think I'm just going to replace the MAF with a new one. It's still the original one from when the car was new. I'm sure it hasn't been very happy being 1.5" from the air filter for the last 2+ years.

      Plus being that now I'm finally going to raise the boost after I sort this all out, since my new high flow in-tank is in, I figure a new MAF wouldn't hurt.


      Engine Shot by dannyglopez, on Flickr

    18. Member Dave926's Avatar
      Join Date
      Mar 30th, 2005
      Location
      Rhode Island
      Posts
      5,289
      Vehicles
      1989 Helios GLI 1997 Mk3 ****box
      08-17-2012 06:27 PM #18
      I know this might seem silly, but check to see that the iat and the clt are within a few degrees of each other before a cold start.

    19. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-20-2012 10:11 PM #19
      Finally got around to cleaning the MAF today. Definitely had visible oil residue on all the plastics. Made a big difference in the way the car drives. A lot less popping and gurgling constantly...and a lot less of the stumbling when i stab the throttle in neutral.

      Also got on it once and it seemed to be cleared up of the Lean WOT conditions.

      I'm thinking it's time for a better air filter. I've had a Spectre but I think it's gunking up the MAF + causing irregular air reading.

      Let's hope that between a clean MAF and a better filter, it stays this way.

    20. 08-21-2012 12:39 AM #20
      Good to hear we nailed this one. I cleaned the maf in my c2 car at every oil change and kept the can of CRC spray in the back with the tools to service at all times. Should see big bump in fuel economy as well.
      Bumblebee Tuna

    21. Moderator DannyLo's Avatar
      Join Date
      Aug 2nd, 2006
      Location
      631/203
      Posts
      13,191
      Vehicles
      Not Vortex Approved
      08-21-2012 10:17 PM #21
      Quote Originally Posted by DieGTi View Post
      Good to hear we nailed this one. I cleaned the maf in my c2 car at every oil change and kept the can of CRC spray in the back with the tools to service at all times. Should see big bump in fuel economy as well.
      Yeah, car is night and day with driveability. I did notice in the recent past that $20 wasn't getting me very far, and I was sure it wasn't just the prices Now I know why.

      I'm going to keep some MAF cleaner with me too.

      Going to change to a better air filter also. I've been reading on the Spectres, and 1; I hear alllll sorts of things on quality. Some good; others terrible. 2; It has this little inverted cone element on the top of the filter, and I have been reading that some MAF car guys, even in some old archived thread on here about VRTs, have reported that it causes shotty MAF readings because of extra turbulent air.

      Here's what I mean:



      That being said, as extra insurance i'm looking into another filter. I really like the ITG stuff and its obviously of tremendous quality, plus the foam would probably make for straighter flow exit out of the filter and into the inlet pipe because of the foam cells, but I can't justify $100 on a filter....yet.

      Comparison of silver Spectre to ITG:



      We'll see I guess

    Posting Permissions

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