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  1. #1
    absolutelymike's Avatar
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    Acceleration juddery and rough idle

    Hi all,

    Hope you had a great weekend.

    I recently bought an A3 2.0 TDI 140 BKD (2005) and it is mostly great fun to drive, however, I am having teething problems with it. It has 125k on the clock and had a new cam belt about 4 years ago (80k). I have read lots of threads/discussions on here already so I know that this is widely talked about.



    The problem: It seems to idle very rough and judders (like the odd misfire) around the 2500 - 3000 rpm if accelerating moderately, which means that it's jerky. If I accelerate through it and change gear above it, I don't feel it so often. It seems happen more on up hill driving, but I have discounted the clutch because of the rough idle and the fact that it does it going down hill too.


    I have taken it to my local garage and they ran the VAG diagnostics and can't find any faults to do with this - although injector 3 is running slightly less than the others, I have been told that this is within tolarance:


    12:34:43 Group 013: Idle Stabilization (Injection Quantity Deviation)
    0.05 mg/str Injection Quantity Deviation Cyl. 1
    0.05 mg/str Injection Quantity Deviation Cyl. 2
    -0.54 mg/str Injection Quantity Deviation Cyl. 3
    0.42 mg/str Injection Quantity Deviation Cyl. 4



    I have been advised to drive a little more sportily because these engines don't appreciate pottering around - I used to drive a VW Transporter before so I wasn't used to high revs!!!


    Anyway, I have changed my driving style but it still doesn't seem right to me. I have read all sorts of articles on line to do with:

    • injectors
    • injector seating
    • injector wiring loom
    • cam timing - torsion settings
    • EGR throttle body
    • air leak
    • fuel filter
    • fuel pump
    • DPF blockage
    • etc

    and really don't have an answer. I tried some injector cleaner from Halfords which didn't make any difference.I intend to try a better one just to see what happens.

    I have had the IMF changed as that was faulty - jammed open - but nothing has changed regarding the juddering.


    I'm hoping this something that somebody's going to say 'Ah, I know what that is...' or 'I've seen this before and its the...'


    I would be grateful of any help advice.

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  3. #2
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    i have and had both these issues, cured the judder on acceleration by changing the fuel filter which helped the judder on idle.

    still have the judder on idle though which is royally annoying, turning the car off sorts that out though

  4. #3
    AudiMafia's Avatar
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    Have you changed fuel filter and oil filter recently? and also cyl nr 3 is throwing minus that can make the car judder at certain speed is doing at mine atm
    A3 8P 2.0TDI 140 Sport | Blue | Full Leather Heated Seat | BOSE | 6 Disc Changer | None Smoking Pack | | Nav | Xenons |
    Mods | 18" Rotiform Staggered | Tinted Windows | S3 Spoiler | 2009 S-Line t Rear | Front Chin Spoiler | Wind Deflectors | Re-Map |
    | MY11 Lights | S3 Side Skirts | Private Number Plate | Milltek Exhaust | S Line Gear knob

  5. #4
    J8TT X's Avatar
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    My rough idle was sorted with a new flywheel and engine mount (it was cracked)
    2005 Audi A3 2.0 TDI DSG S-line (8p1)
    Mods: 18" Gloss Black RS4's - 8p2 S-line Front Bumper - Black Grill - A5 LED Number Plate lights - LED Sidelights - Euro Style Plates - EGR Delete - RTech Custom Remap - Hot Start Issue Fix
    Pipeline: Lowering, Wheel Refurb, Coming Home Lights

    2007 VW Golf 2.0 GT TDI 140 (Wife's)
    Mods: 18" Charlestons

  6. #5
    absolutelymike's Avatar
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    thanks for the replies guys, much appreciated. I'm gonna start with the cheapest option first by changing the fuel filter. I'll report back if it makes a difference.
    A3 2.0 TDI 140 BKD (2005)

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    When idling, remove the oil cap check if suction behind it?!

  8. #7
    absolutelymike's Avatar
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    thanks Dan_Mol, but what does that indicate?
    A3 2.0 TDI 140 BKD (2005)

  9. #8
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    Faulty PCV

    Replaced mine last Friday, gasket and valve £52 from TPS.

    If you check oil cap and pressure behind I'll send part numbers over, took about 20-30mins to change.

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    Possibly ignore that didn't the important part of being a diesel.

  11. #10
    sportbacksport's Avatar
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    Quote Originally Posted by absolutelymike View Post
    thanks for the replies guys, much appreciated. I'm gonna start with the cheapest option first by changing the fuel filter. I'll report back if it makes a difference.

    Try replacing the temperature sensor! I had a similar problem on my mk5 golf and fixed it.

  12. #11
    tdi-man's Avatar
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    the - reading is not a problem unless in reaches -3 or +3

    judder on idle on mine was fixed by turning the idle down to 800 - 810


    Quote Originally Posted by AudiMafia View Post
    Have you changed fuel filter and oil filter recently? and also cyl nr 3 is throwing minus that can make the car judder at certain speed is doing at mine atm
    Full Leather / heated Seats / 18" Speedlines / AP coilover kit / R32 Rear 310mm Brakes / window Tints / Auto lights / Xenons / Cruise control / R32 Front 345mm Brakes / Full milltek system / Led side lights / Bose / brushed aluminium inlays / panal filter / Full Egr delete / custom map with hot start fix / Hybrid Turbo / Sachs Racing clutch / 10mm Rear spacers / 10mm Front spacers / A5 LED number plate bulbs /

    233 bhp - 309 ft lb - 419 nm (NEEDS A NEW MAP)




  13. #12
    absolutelymike's Avatar
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    Reporting back that the fuel filter change was quick and easy. Unfortunately it did not cure the acceleration judders!
    Oil filter was changed at the last service and the idle is at 800 btw chaps.

    May have to book this in with a tuning expert for a second opinion.
    A3 2.0 TDI 140 BKD (2005)

  14. #13
    tdi-man's Avatar
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    have u looked at idle speed in vag com
    Full Leather / heated Seats / 18" Speedlines / AP coilover kit / R32 Rear 310mm Brakes / window Tints / Auto lights / Xenons / Cruise control / R32 Front 345mm Brakes / Full milltek system / Led side lights / Bose / brushed aluminium inlays / panal filter / Full Egr delete / custom map with hot start fix / Hybrid Turbo / Sachs Racing clutch / 10mm Rear spacers / 10mm Front spacers / A5 LED number plate bulbs /

    233 bhp - 309 ft lb - 419 nm (NEEDS A NEW MAP)




  15. #14
    absolutelymike's Avatar
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    yes tdi_man, it reads 819.
    A3 2.0 TDI 140 BKD (2005)

  16. #15
    tdi-man's Avatar
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    820 - 830 I get a shake

    800 - 810 I don't


    Quote Originally Posted by absolutelymike View Post
    yes tdi_man, it reads 819.
    Full Leather / heated Seats / 18" Speedlines / AP coilover kit / R32 Rear 310mm Brakes / window Tints / Auto lights / Xenons / Cruise control / R32 Front 345mm Brakes / Full milltek system / Led side lights / Bose / brushed aluminium inlays / panal filter / Full Egr delete / custom map with hot start fix / Hybrid Turbo / Sachs Racing clutch / 10mm Rear spacers / 10mm Front spacers / A5 LED number plate bulbs /

    233 bhp - 309 ft lb - 419 nm (NEEDS A NEW MAP)




  17. #16
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    Quote Originally Posted by tdi-man View Post
    820 - 830 I get a shake

    800 - 810 I don't
    how'd you change it?

  18. #17
    absolutelymike's Avatar
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    Oh, and I've also noticed that it only does it when the engine is hot. If I use the rev range 2500 - 3000 when it's cold I don't get the judders. Weird, you'd expect it to be the other way round.
    A3 2.0 TDI 140 BKD (2005)

  19. #18
    absolutelymike's Avatar
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    I'm thinking it could be a temp sensor. Could this cause it to start missing when hot?
    A3 2.0 TDI 140 BKD (2005)

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    Might be worth checking the fuel pipes from the filter havent been swapped a garage put mine on the wrong way round once and my car did the same as you described.

  21. #20
    absolutelymike's Avatar
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    thanks Matt_Storm, I'll mention that when it gets checked over on Thursday as I wouldn't know if it looked wrong or not!

    The temp light came on today because the coolant was way to low. I've done 1000 miles since I last checked it and I was surprised to see the light come on. It may well not have had enough antifreeze/G12 in it or could it be another sign that something's not right?
    A3 2.0 TDI 140 BKD (2005)

  22. #21
    AudiMafia's Avatar
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    Quote Originally Posted by absolutelymike View Post
    I'm thinking it could be a temp sensor. Could this cause it to start missing when hot?
    i changed that and it made no difference
    A3 8P 2.0TDI 140 Sport | Blue | Full Leather Heated Seat | BOSE | 6 Disc Changer | None Smoking Pack | | Nav | Xenons |
    Mods | 18" Rotiform Staggered | Tinted Windows | S3 Spoiler | 2009 S-Line t Rear | Front Chin Spoiler | Wind Deflectors | Re-Map |
    | MY11 Lights | S3 Side Skirts | Private Number Plate | Milltek Exhaust | S Line Gear knob

  23. #22
    absolutelymike's Avatar
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    It turns out that it could be injector 1. So the garage are getting an injector so that they can swap them about ... I will keep this thread updated as I have read a lot of stories similar to mine.

    Oh and the radiator leaks, that explains the coolant loss.
    A3 2.0 TDI 140 BKD (2005)

  24. #23
    tdi-man's Avatar
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    0.05 mg/str Injection Quantity Deviation Cyl. 1
    0.05 mg/str Injection Quantity Deviation Cyl. 2
    -0.54 mg/str Injection Quantity Deviation Cyl. 3
    0.42 mg/str Injection Quantity Deviation Cyl. 4

    shows is very good for injectors
    Full Leather / heated Seats / 18" Speedlines / AP coilover kit / R32 Rear 310mm Brakes / window Tints / Auto lights / Xenons / Cruise control / R32 Front 345mm Brakes / Full milltek system / Led side lights / Bose / brushed aluminium inlays / panal filter / Full Egr delete / custom map with hot start fix / Hybrid Turbo / Sachs Racing clutch / 10mm Rear spacers / 10mm Front spacers / A5 LED number plate bulbs /

    233 bhp - 309 ft lb - 419 nm (NEEDS A NEW MAP)




  25. #24
    chris.vincent3's Avatar
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    I had this sort of problem on mine once I fitted an ITG Maxogen air filter, removed it and put original back on and seems fine. Have you got an aftermarket air filter on it?

  26. #25
    absolutelymike's Avatar
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    Those injector readings were taken when cold, they read differently when hot. It's still at the garage so I can't check the air filter although I will mention it to them. Thanks for the input guys.
    A3 2.0 TDI 140 BKD (2005)

  27. #26
    absolutelymike's Avatar
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    So, just for anyone that was reading this and wanted to know the outcome. It is now two days after injector 1 was replaced and the car is driving without judders! On idle it is mostly better and I can live it, far better than it was.
    A3 2.0 TDI 140 BKD (2005)

  28. #27
    tdi-man's Avatar
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    did u keep the old 1



    Quote Originally Posted by absolutelymike View Post
    So, just for anyone that was reading this and wanted to know the outcome. It is now two days after injector 1 was replaced and the car is driving without judders! On idle it is mostly better and I can live it, far better than it was.
    Full Leather / heated Seats / 18" Speedlines / AP coilover kit / R32 Rear 310mm Brakes / window Tints / Auto lights / Xenons / Cruise control / R32 Front 345mm Brakes / Full milltek system / Led side lights / Bose / brushed aluminium inlays / panal filter / Full Egr delete / custom map with hot start fix / Hybrid Turbo / Sachs Racing clutch / 10mm Rear spacers / 10mm Front spacers / A5 LED number plate bulbs /

    233 bhp - 309 ft lb - 419 nm (NEEDS A NEW MAP)




  29. #28
    absolutelymike's Avatar
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    nope, didn't think to ask :/
    A3 2.0 TDI 140 BKD (2005)

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    I had the same problem and I took the injectors out and give them a clean with wire wool fitted them and the problem disappeared this was over a year ago, I tried all sorts of injector cleaner and none of them worked

 

 

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