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    Thread: Start-Up Issues and 3k rpm cutout 1.8t ARX

    1. 07-10-2019 06:21 AM #1
      Hello guys,

      Unfortunately the first post on the forums would be about something not pleasant.

      First off - car is a 2001 Skoda Octavia 4x4 with the ARX engine, hence the K03s turbo and the full SAI, n112 and n249 package.

      Ever since I got the car I had issues with the cold start but not other issues. Then being very smart I got a tune which resulted in a cut at around 3,000 rpm - the car just stops accelerating followed by a big bang somewhere at the front and then I have to get off the throttle and back on it and everything is fine past 3,500 rpm.

      After changing coils and sparks, knowing that the stock DVs are prone to failure after a tune, I got a new DV. Being the smart lad that I am, I ended up getting the infamous SPLITR from Forge. The result was... The exact same behavior. After vising another tuner, he concluded that the issue was with the SPLITR and indeed, disconnecting the vacuum going to it, putting a small screw to block the vaccum line. Indeed the issue with the cold start and the cutout was gone. However, I knew that running the car like this was not fine, and I was mildly worried that with the disconnected DV I still couldn't hear the distinct tutututu, which I should be getting at this config.

      I ended up bypassing the N112 and the N249 (the correct way - getting the vacuum from the manifold, not tapping into the FPR) and the result was a much better DV operation, however by twisting the SPLITR I was only moving the cut out point between 3 and 5k RPM. Disconnecting it again made the car run perfectly.

      A couple of days ago my 007P arrived, since after reading many posts about the beauty that the SPLITR, and having the tuner opinion that it should not be used on a 1.8T, I decided this was my point of failure. After I installed the 007P (tried both ways) I get the same result. Engine rattles like a mofo when starting up and cuts off a 3k RPM. Whatsmore, with the vacuum line disconnected and the much clearer noises that the 007P does compared to the SPLITR, now I can certainly say that when disconnected I can hear air going trough the filter (running a standard cone filter which results in a woosh sound). However, when connected I can hear only a sound of air going trough a small metal pipe (thats what it sounds like) below 3k RPM and can hear the air filter woosh above 4k. With the 007p disconnected, I cant hear any sound of turbo surge, which I guess I should get.

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    3. Senior Member Vegeta Gti's Avatar
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      07-10-2019 10:08 AM #2
      So you have no logs.....

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      Quote Originally Posted by .Ant View Post
      What vegeta said.

    4. Senior Member Vegeta Gti's Avatar
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      07-10-2019 10:14 AM #3
      I noticed you have one post.

      Go read the faq and do some searching. Don't throw parts at it. Get vagcom.

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      :HOMEGROWN MOTORSPORTS..SingerVehicleDesign...1:4.9 SuaSponte #13Dead Rabbits. Ungluck on IG. MKIforLife
      Quote Originally Posted by .Ant View Post
      What vegeta said.

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    6. 07-10-2019 11:06 AM #4
      Hey,

      Sorry, forgot to mention that.

      As far as checking with VCDS - no errors show up, I haven't gotten any CELs either.

      I will log the car later today and upload them.

    7. Senior Member Vegeta Gti's Avatar
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      07-10-2019 01:13 PM #5
      Logs can help so much

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      Quote Originally Posted by .Ant View Post
      What vegeta said.

    8. Member Laamapalmu's Avatar
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      07-11-2019 02:57 AM #6
      And what happens when you unplug your MAF? Car not going past 3K sounds like it's running on limp or more like maffless.
      Is my Check Engine light broken as it never lits up

    9. 07-11-2019 08:41 AM #7
      So, I tried disconnecting the MAF and the car ran the exact same way.

      PFB the logs -

      https://drive.google.com/file/d/14NQ...ew?usp=sharing

      https://drive.google.com/file/d/14dD...ew?usp=sharing

    10. Senior Member Vegeta Gti's Avatar
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      07-12-2019 11:56 AM #8
      I can't open the logs. Says no longer available

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      Quote Originally Posted by .Ant View Post
      What vegeta said.

    11. 07-15-2019 01:14 AM #9
      Reuploaded:

      https://drive.google.com/file/d/14NQ...ew?usp=sharing



      https://drive.google.com/file/d/14dD...ew?usp=sharing

      Pasting them just in case:

      Group A: 003 Group B: 115 Group C: 020
      Engine Speed Mass Air Flow Throttle Valve Angle Ignition Engine Speed Engine Load Boost Pressure Boost Pressure Timing Retardation Timing Retardation Timing Retardation Timing Retardation
      TIME (G28) (G70) Timing Angle TIME (G28) (specified) (actual) TIME Cylinder 1 Cylinder 2 Cylinder 3 Cylinder 4
      STAMP /min g/s % ░BTDC STAMP /min % mbar mbar STAMP ░KW ░KW ░KW ░KW
      0.6 2200 48.08 100 4.5 0 2080 97 1780 1300 0.3 2.3 0 0 3
      1.51 2440 58.81 100 4.5 0.9 2280 113.5 2030 1500 1.21 1.5 0 0 1.5
      2.41 2680 73.83 99.6 3 1.81 2520 127.1 2130 1690 2.11 0 0 0 0.8
      3.32 2880 86.22 100 0.8 2.71 2760 142.1 2160 1930 3.02 0 0 0 0
      4.22 3080 98.17 100 3.8 3.62 2960 155.6 2160 2110 3.92 0 0 0 0
      5.13 3200 103 100 4.5 4.53 3120 163.9 2130 2200 4.83 0 0 0 0
      6.03 3400 110.22 99.6 1.5 5.43 3280 153.4 2110 2010 5.73 0 0 0 0
      6.94 3560 113.08 98 3 6.34 3480 154.1 2060 2220 6.64 0 0 0 0
      7.84 3720 113.14 99.6 2.3 7.24 3600 166.9 2070 2190 7.54 0 0 0 0
      8.75 3800 122.03 99.6 5.3 8.15 3760 145.9 2020 1900 8.45 0 0 0 0
      9.65 3960 125.78 100 5.3 9.05 3880 154.9 1990 2030 9.35 0 0 0 0
      10.56 4120 103.81 100 9 9.96 3960 164.7 1930 2220 10.26 0 0 0 0
      11.46 4240 112.42 100 6 10.86 4160 139.8 1890 1930 11.16 0 0 0 0
      12.37 4440 114.33 100 9 11.77 4320 133.1 1850 1810 12.07 0 0 0 0
      13.28 4600 116.31 100 10.5 12.67 4480 133.1 1820 1820 12.97 0 0 0 0
      14.18 4800 118.56 99.2 11.3 13.58 4680 129.3 1770 1780 13.88 0 0 0 0
      15.09 4960 17.64 5.9 5.3 14.48 4880 125.6 1740 1700 14.79 0 0 0 0
      15.99 4560 10.61 8.2 3.8 15.39 4800 11.3 940 1080 15.69 0 0 0 0



      Group A: 003 Group B: 118 Group C: 031
      Engine Speed Mass Air Flow Throttle Valve Angle Ignition Engine Speed Intake Air Wastegate (N75) Boost Pressure Lambda Control Lambda Control Bin. Bits Bin. Bits
      TIME (G28) (G70) Timing Angle TIME (G28) Temperature (G42) Duty Cycle (actual) TIME Bank 1 (actual) Bank 1 (specified)
      STAMP /min g/s % 蚪TDC STAMP /min 蚓 % mbar STAMP
      0.6 2080 40.64 99.6 6 0 1960 46 95.3 1130 0.3 1.016 0.93
      1.51 2280 52.97 100 3.8 0.9 2120 45 95.3 1360 1.21 0.899 0.852
      2.41 2520 64.08 100 1.5 1.81 2360 45 95.3 1600 2.11 0.938 0.828
      3.32 2760 79.94 100 2.3 2.72 2600 45 95.3 1830 3.02 1.031 0.828
      4.22 3000 92.17 100 4.5 3.62 2840 45 95.3 2050 3.92 1.14 0.828
      5.13 3160 99.69 100 4.5 4.53 3040 46 95.3 2180 4.83 1.257 0.828
      6.03 3280 108.64 99.6 3.8 5.43 3280 76 95.3 2010 5.73 1.25 0.828
      6.94 3480 102.28 100 4.5 6.34 3400 67 78 2260 6.64 1.172 0.828
      7.85 3720 102.83 100 5.3 7.24 3560 59 82 2010 7.54 1.164 0.828
      8.75 3920 107.22 100 6 8.15 3760 57 81.2 1940 8.45 1.156 0.828
      9.65 4160 112.97 99.6 6.8 9.05 4000 57 80.4 1910 9.35 1.125 0.813
      10.56 4360 115.44 100 5.3 9.96 4200 59 79.2 1930 10.26 1.133 0.813
      11.47 4600 122.61 100 9 10.86 4440 61 79.2 1900 11.16 1.133 0.813
      12.38 4840 126.64 100 8.3 11.77 4680 63 78 1840 12.07 1.101 0.821
      13.28 5040 128.94 100 7.5 12.68 4920 66 77.6 1810 12.98 1.078 0.821
      14.18 4880 13.72 7.1 4.5 13.59 5080 67 0 1780 13.89 0.797 0.922

    12. Senior Member Vegeta Gti's Avatar
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      07-16-2019 10:11 AM #10
      Posting a log like that in here.... I'm on tapatalk. It's just shear numbers. No breaks etc..

      Sent from my SM-N950U using Tapatalk
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      Quote Originally Posted by .Ant View Post
      What vegeta said.

    13. 07-16-2019 10:16 AM #11




      This ought to work

    14. Member Laamapalmu's Avatar
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      07-18-2019 02:33 AM #12
      Malone tuning has online log viewer that is really useful. You just upload VCDS log into it and it automatically draws all log values into a chart, also it shows the raw data in bottom of the site. Totally free.
      Is my Check Engine light broken as it never lits up


    15. 08-12-2019 06:36 AM #14
      Quick follow-up,

      Replaced the N75, checked the camshaft chain and tensioners, checked the fuel pump relay - none of them were faulty.

    16. 09-07-2019 02:18 AM #15
      Following up again,

      Did the full SAI and EVAP delete, chain tensioner and chain (terrible start up rattle is gone, intake cam was way off) and a new OEM Bosch MAF.

      Not only did this not fix anything, but the car now devours fuel like crazy.

      With the A/C off I get around 0.8-0.9L/hour while still, however with the A/C on in gets to 1.8-1.9 and this difference goes over to driving and etc.

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