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  1. #1
    Active Member One Ring socom458's Avatar
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    2010 A5 2.0 hesitation and stumble under light acceleration

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    Hello, looking for help on what to log with vag-com for a hesitation and intermittent fumble issue at 2500-3000 rpm under light acceleration. I have searched and read dozens of posts, but still am not sure how to get actual data to define next steps.

    hesitation is constant on any slow acceleration, WOT masks the issue, but still there. Stumble is intermittent at the same time (in conjunction with hesitation), and feels like a quick misfire. When the stumble happens, if my windows are up and radio off, etc. I can hear the turbo and it sounds like it spools up, lets off, spools up, lets off, etc. like the wastegate is opening or something. I have no codes, no CEL. New to the 2.0, came from a B6 1.8t. Have limited VAG knowledge, but can follow directions. I am never sure how to read the logs. attached is a log of actual vs requested boost, not sure why actual is higher than requested, but i guess there is some atmospheric value i need to subtract.

    Things i have done recently(just acquired this used car). New plugs, coils (red top). New front O2 sensor, new MAF, New PCV, later replaced with 034Motorsport PCV\Catch Can kit, Go Fast bits diverter kit, New A\C pressure switch,New N75 valve.
    Audi dealership 90,000 scheduled maintenance, with BG induction cleaning (some cleaner in a can for injectors, not intake removal and valve scrub)

    Car idles perfectly, needle never bounces.

    Any ideas on what to log with Vag to help narrow the search?


    graph from VAG logs: https://drive.google.com/file/d/10JN...ew?usp=sharing
    raw data in ods format (open office): https://drive.google.com/open?id=18_...HFftwhogmIHUeA
    Last edited by socom458; 08-16-2018 at 08:59 AM. Reason: details added
    Central Ohio
    2010 Audi A5 2.0

  2. #2
    Active Member One Ring socom458's Avatar
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    anyone have a good starting point for things to log with vag-com for this type of issue?
    Central Ohio
    2010 Audi A5 2.0

  3. #3
    Active Member One Ring socom458's Avatar
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    figured out the issue, since this post got a couple views, thought i would post the issue. Pulled front O2 sensor and ran a $20 android bluetooth camera(scope) inside to look at the back of the turbo. Turbo wastegate is not seating well at all, in fact probably 1/8 " or more open at rest. I tested the linkage\actuator rod originally, and found no movement along the length of the rod (from front of car to back of car motion). This time i did notice quite a bit of slop jiggling from driver side to passenger side motion. Camera confirms waste gate is hanging open, and jiggles around.

    Currently making calls to see if my AUL aftermarket extend warranty will handle it. According to the docs, the factory turbo and all internals are covered, just getting approval to take it to the audi dealership for diagnosis.

    will update after progress is made.
    Central Ohio
    2010 Audi A5 2.0

  4. #4
    Established Member Four Rings wkhanna's Avatar
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    just saw your post, socom...

    this is xlent info!!!!
    i love the trick you used to scope the waste gate....

    were you ever getting a CEL?
    specifically the 0299....

    can give a link for the scope you used???
    Billy

    Practicing Curmudgeon & Audio Snob

    2011 A5 2.0T Old Man Project
    2011 A4 quattro 2.0t (The Wife's)
    1983 Porsche 944 (Modified)
    1985 BWM K100RS (since new - Heavily Modified)
    1971 Moto Guzzi Elderodo
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  5. #5
    Active Member One Ring socom458's Avatar
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    Quote Originally Posted by wkhanna View Post
    just saw your post, socom...

    this is xlent info!!!!
    i love the trick you used to scope the waste gate....

    were you ever getting a CEL?
    specifically the 0299....

    can give a link for the scope you used???

    Hi, funny thing is, i kind of suspected the wastegate, as I had the same problem on my A4 B6. I just didn't feel like dropping the exhaust to have a look. I was swapping the front O2 sensor, and it just hit me.......... you get a pretty nice view of the wastegate and turbo fan.

    I never get a CEL, i believe you have to have a difference of 10psi between requested vs actual boost (i got this info from my old tuner on the A4 B6, so may not be applicable here)

    any of the scopes should work, i got this one, but it was on the clearance row and was like $20 or something..
    http://www.microcenter.com/product/5...doscope-camera


    just your basic wifi android scope with light. very handy.. also used it to find the head gasket leak on the back side of my landrover engine!

    Hope it helps. I have an appt. on 8/15 with the dealership to see if i can get it replaced under an aftermarket warranty program.


    also, if you happen to have any software (vagcom or OBDEleven, Torque) log requested boost vs actual boost. I compared my old logs from the A4 (same issue) with the A5. When you upload the logs to: http://log.malonetuning.com/upload the telltale sign is the boost curve is right on(graphically), but actual boost is lower than requested. The curve looks good, matches up, etc.. just lower number across the board on actual boost.
    Last edited by socom458; 08-13-2018 at 07:59 PM.
    Central Ohio
    2010 Audi A5 2.0

  6. #6
    Established Member Four Rings wkhanna's Avatar
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    that is a fantastic source of data you linked us to.... thank you!!!!
    Billy

    Practicing Curmudgeon & Audio Snob

    2011 A5 2.0T Old Man Project
    2011 A4 quattro 2.0t (The Wife's)
    1983 Porsche 944 (Modified)
    1985 BWM K100RS (since new - Heavily Modified)
    1971 Moto Guzzi Elderodo
    Avatar Chart

  7. #7
    Active Member One Ring socom458's Avatar
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    TL;DR - all said and done, new audi turbo covered under aftermarket warranty, my cost will be $510. Not too bad really, being that I couldn't get the part(new OEM) and do it myself for that cost.

    Got confirmation today, the aftermarket warranty company will pay for the new turbo, well, sort of. Basically, worked like this:

    dropped car off wednesday audi looked at the turbo, they confirmed the loose actuator, and acknowledged my VCDS logs. They presented the data and their opinion to the aftermarket warranty company, with an estimate of about $2800 plus tax and shop supplies. The warranty co. advised they would need to send out a company inspector. Inspector advised they would be out in 24-72 hours to have a look. Friday late morning, inspector arrives at the dealership. The inspector mentioned they would really need to have a OBD2 code to warrant the replacement of a turbo. The technician advised there was no code, but described the symptoms and presented the graph. The inspector took the next 2 hours visually inspecting the loose linkage, and riding in the vehicle with the dealer version of Vagcom hooked up and driving with the dealer technician, logging data. Inspector left without discussion, and no word of whether or not the part would be covered. Late afternoon on Monday, i got word from the dealership, the repair was approved, but they warranty company wanted to send a cheaper turbo(unknown, non-audi part)which would take a couple more days. I advised I preferred the audi dealer part (factory new, audi part), was told I would have to pay the ~$350 price difference, plus my $100 deductible. Since they agreed to the fix, they would also handle the diagnostic fees to the dealer ~$300. If i would have fronted a rental car, they would have to reimburse for that as well, but i didn't need one anyway.

    So, all said and done, new audi OEM turbo covered under aftermarket warranty, my cost will be $510. Not too bad really, being that I couldn't get the part(new OEM) and do it myself for that cost. Quite a bit of hassle and delay to deal with, but i have a very flexible work schedule, and work remote anyway, so it is doable for me. Repair should be done tomorrow, will report back after i pick up the car and take it for a spin. The aftermarket warranty was just under $3K, so i may actually break evenish on this.. Now I can finally get that ECU tune!
    Last edited by socom458; 08-21-2018 at 02:48 PM.
    Central Ohio
    2010 Audi A5 2.0

  8. #8
    Active Member One Ring socom458's Avatar
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    just drove it home (about 25 miles), hesitation seems to be gone. acceleration seems to be much smoother. Need to hook up the vag-com and run another graph when I get a chance. Will post after i graph it.


    Will test drive it over the next couple days and report back if problem persists.

    hope this helps.
    Brian
    Central Ohio
    2010 Audi A5 2.0

  9. #9
    Established Member Four Rings wkhanna's Avatar
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    this is great info!!!!

    glad you got it resolved to your satisfaction!
    Billy

    Practicing Curmudgeon & Audio Snob

    2011 A5 2.0T Old Man Project
    2011 A4 quattro 2.0t (The Wife's)
    1983 Porsche 944 (Modified)
    1985 BWM K100RS (since new - Heavily Modified)
    1971 Moto Guzzi Elderodo
    Avatar Chart

  10. #10
    Established Member Two Rings wunderman4's Avatar
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    I've been having the exact same issue. I just bought the car a few weeks ago and thought it was the dv, replaced it and the same thing kept happening. Now I know not to go crazy replacing all the smaller parts and just wait for k04 money lol.

    Sent from my Pixel 2 using Tapatalk
    ༼ つ ಥ_ಥ ༽つ

  11. #11
    Active Member One Ring socom458's Avatar
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    Quote Originally Posted by wunderman4 View Post
    I've been having the exact same issue. I just bought the car a few weeks ago and thought it was the dv, replaced it and the same thing kept happening. Now I know not to go crazy replacing all the smaller parts and just wait for k04 money lol.

    Sent from my Pixel 2 using Tapatalk
    Sounds like a good plan.

    Sent from my Pixel XL using Audizine mobile app
    Central Ohio
    2010 Audi A5 2.0



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