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Thread: Engine Stuttering Hesitation at Constant Speed (Tdi)

  1. #11
    Join Date
    Apr 2009
    Location
    Staines, Middlesex, UK
    Posts
    11,975
    Quote Originally Posted by rosscanning View Post
    Hi 'foghorn',

    I have/had exact symptoms, Although it didn't matter wether engine was warm.

    I decidied after driving nearly 10k miles like this enough was enough, I was going to tackle fuel first so I changed filter today and you wouldn't believe the black gunk on underside of the lid and the filter well you can guess. Cleaned it all up popped new filter in snapped small screw �� never mind. Took a while for engine to fire (waiting for fuel) drove to shell, filled up with V power diesel and after 100miles on i have full boost no shuddering at all.

    I would consider trying this first, only 20 for new filter and around 1hours fitting ����

    Pictures to show you the amount of dirt in fuel filter:
    Attachment 29730 Attachment 29731
    I had a similar problem with my wife's TDI 90 a few years back. Only it would almost die, especially on the motorway.

    Had all sorts of scary diagnostics from the mechanic, including the intercooler and even the turbo.

    But when he took the filter off it was FULL of black gunge like that.

    I reckon it is from a bad batch of fuel from the supermarket we filled up at a few miles earlier.

    It is always worth renewing the filter with symptoms like that.

    The error code I was getting was an overboost one, which help confuse things, but I reckon that this error was caused because technically there was more boost than the fuel could supply. A tank flush and a fresh filter and it has never missed a beat since.

    I am now going to say something while touching wood (sounds a bit rude that for some reason) but this has been the ONLY breakdown in any TDI across the 7 TDIs in our family, and that is over 16 years of driving A2s (and family driving) !!!!! Can you see why I lean my bias slightly toward the TDIs, but recent times the FSIs have grown on me a lot.

    Steve B

  2. #12
    Join Date
    Feb 2002
    Location
    Cheshire, UK
    Posts
    394
    Quote Originally Posted by rosscanning View Post
    Have you managed to change your fuel filter 'foghorn'?

    Would be great to hear from you and see if this has solved the issue with your A2

    Ross
    Ross - Been away for 3 weeks and just back. I'm hopefully doing the filter change this Friday as I've got a couple of long trips to Scotland coming up.
    At the Annexe: 2004 TDI SE (90Bhp) Mauritius Blue, 16" 5 Spoke alloys, Satellite cloth, Parrot Bluetooth
    On the Drive: 2004 TDI SE Mauritius Blue, Black cloth, Concert II, CC, Parrot CK3000 Bluetooth (Fitted by Skipton) & 2003 TDI SE, Cobalt Blue, Black Leather, Sydmeko armrest, PDC, DIS, Alu Pack, S3 Leather Gear Shift, CC, Concert II, Parrot, Performance Discs, Stealth re-map. Bought from here courtesy of Havank.
    In the Garage: 1993 Porsche 964 Celebration. Polar Silver, Big Hips

  3. #13
    Join Date
    Nov 2010
    Location
    Hartlepool
    Posts
    337
    Hi buddy,

    As it has been mentioned before do not over tighten the plastic nut (10mm I think) even by hand can fluffy it, yours will be 13 years old so super brittle...

    Enjoy, I get huge satisfaction out of repairing/maintaining my A2. And hopefully it will cure your problem. My car has been running Better then I can remember.

    Ross

    Or and post a picture of the inside of filter lid

  4. #14
    Join Date
    Feb 2002
    Location
    Cheshire, UK
    Posts
    394
    I'm not now convinced it is the filter that causing the problem but I will look to change it anyway.

    Went out in it yesterday for 2 x 15 mile runs at varied speeds and all was well running normal/perfect. Set off this moring for a trip to Coventry and the car started up as usual, then after about 10 mins on the motorway (warming up) the car went into 'limp' mode which feels like the turbo drops out and then started to stutter quite noticeably as if it was mis-firing. So I did the usual trick of ignition off then back on and that cleared the limp mode but still some erratic stuttering. Went into limp mode again. Repeated the exercise and cleared it which sorted things out. After that I would best describe it as 'semi-limp' in that I could keep it at 70mph and not lose power on gradients. Managed to do the 110 mile trip. During this I was getting no warning lights.

    After a few hours for the retrun journey the engine started OK but rough idle/acceleration and limp. Ignition off/on and cleared with a few sessions of rough running/limp all the way home.

    Leave the car 30 mins and need to nip out local. Car starts and drives a treat - perfect. Park up for an hour and returning home I get the same erratic issues. I'm now also occasionally getting the ABS/Traction orange light with the big red (!) in the DIS which I am presuming is brakes related and somehow triggered by the rough engine vibration.

    Anyway you get the picture, it's erratic, inconsistent and only when the engine appears to be warm (not cold from overnight). This is leading me to think its an injector? or points to bad connections from the injector wiring loom as it appears to be mis-firing???

    Any clues?
    Last edited by Foghorn; 27-07-2017 at 08:44 PM.
    At the Annexe: 2004 TDI SE (90Bhp) Mauritius Blue, 16" 5 Spoke alloys, Satellite cloth, Parrot Bluetooth
    On the Drive: 2004 TDI SE Mauritius Blue, Black cloth, Concert II, CC, Parrot CK3000 Bluetooth (Fitted by Skipton) & 2003 TDI SE, Cobalt Blue, Black Leather, Sydmeko armrest, PDC, DIS, Alu Pack, S3 Leather Gear Shift, CC, Concert II, Parrot, Performance Discs, Stealth re-map. Bought from here courtesy of Havank.
    In the Garage: 1993 Porsche 964 Celebration. Polar Silver, Big Hips

  5. #15
    Join Date
    Nov 2010
    Location
    Hartlepool
    Posts
    337
    Hand on heart I had exactly the same symptoms...

    Try the cheapest option first, fuel filter. If this doesn't cure then further investigation is needed.
    oil misting around intercooler were alloy has split. Another culprit injector wiring harness...

    I was constantly scanning my car with VCDS with no error codes appearing, other than one time I met up with Simon and I had a fault code 'P1556 - charge pressure control: negative deviation'. Simon cleared it and never returned. But I still had the symptoms. After driving 10,000 miles like this I decided enough was enough. I swapped air filter with a new one but no change, so I went and bought a fuel filter with doubt in my mind. But I came to the conclusion my engine was getting starved of air or fuel with having already change air filter it had to be this.
    If filter didnt help I was going to have a fuel line flush carried out.

    From now on I'll be changing fuel filter every oil change.

    Let us know how you get on, and remember don't over tighten the small plastic nut!

    Ross

  6. #16
    Join Date
    Feb 2002
    Location
    Cheshire, UK
    Posts
    394
    Thanks Ross. Looks like I'll try that approach first and report back. Ever since I've had the car it will occasionally go into limp mode usually c2000rpm constant. However a stop/start has always cleared it and I've gone for months/years without it coming back so it hasn't concerned me. But now it's several times a session!
    At the Annexe: 2004 TDI SE (90Bhp) Mauritius Blue, 16" 5 Spoke alloys, Satellite cloth, Parrot Bluetooth
    On the Drive: 2004 TDI SE Mauritius Blue, Black cloth, Concert II, CC, Parrot CK3000 Bluetooth (Fitted by Skipton) & 2003 TDI SE, Cobalt Blue, Black Leather, Sydmeko armrest, PDC, DIS, Alu Pack, S3 Leather Gear Shift, CC, Concert II, Parrot, Performance Discs, Stealth re-map. Bought from here courtesy of Havank.
    In the Garage: 1993 Porsche 964 Celebration. Polar Silver, Big Hips

  7. #17
    Join Date
    Feb 2002
    Location
    Cheshire, UK
    Posts
    394
    OK Chums - Update time.

    I've changed the filter and no difference. Fuel filter was not dirty and very little crud in the cap. Car started perfectly after the change and as it warmed up started to stutter. Took it for a short drive and it's still hesitant/stuttering now most of the time. Turning off and then on will put it back to normal but only briefly before I get the same problems.

    I'm leaning more to injector wiring loom and either dirty contacts or replace the whole thing, but as I'm not around for the next two weeks it looks like the job will fall to a garage - Vector @Northwich who were very helpful on the phone suggesting I changed the fuel filter myself to see if it sorts it. Ideally it needs a scan of the ECU to see what faults are in there as well.
    At the Annexe: 2004 TDI SE (90Bhp) Mauritius Blue, 16" 5 Spoke alloys, Satellite cloth, Parrot Bluetooth
    On the Drive: 2004 TDI SE Mauritius Blue, Black cloth, Concert II, CC, Parrot CK3000 Bluetooth (Fitted by Skipton) & 2003 TDI SE, Cobalt Blue, Black Leather, Sydmeko armrest, PDC, DIS, Alu Pack, S3 Leather Gear Shift, CC, Concert II, Parrot, Performance Discs, Stealth re-map. Bought from here courtesy of Havank.
    In the Garage: 1993 Porsche 964 Celebration. Polar Silver, Big Hips

  8. #18
    Join Date
    Apr 2009
    Location
    Staines, Middlesex, UK
    Posts
    11,975
    Check out the crankshaft and camshaft sensors, especially if there are any errors that mention either.

    They can sometimes only show symptoms when the engine is hot.

    (sorry if you have already mentioned them?)

    Steve B
    White (non-Factory) TDI 90 - BOSE, MFSW, DIS, cruise, Headlamp washers, rear cupholders, Votex style rear spoiler, Votex body kit (in progress), Heated (twist) leather, double DIN, Colour DIS (in progress), rear Power Socket, false floor, Auto headlights, LED interior bulbs, currently on 17" QT Alloys (OEM), Auto dimming mirror, heated door mirrors, 4 electric windows, Front fogs.

    VCDS and Key programming service, Votex Jacking points available.

  9. #19
    Join Date
    Feb 2002
    Location
    Cheshire, UK
    Posts
    394
    Chaps an update now I'm back home and can scan the bill.

    As I suspected from the start and as others directed the 'stuttering' fault was an injector issue. Before the strip down the garage thought it may need a new injector but would test it first along with a compression test. Fortunately the test on the injector came back sound, suggesting electrical the loom was checked over, connectors cleaned and rebuilt etc.

    A scan picked up fault 'R01/Boost Pressure Deviation' and was identified as a hole in the intercooler. I suspect this is not connected to the stuttering issue but that has exacerbated what has been an occasional long standing issue where it would randomly go into limp mode. I'd lived with the very occasional limp mode issue since I bought the car as it could usually be resolved with a ignition off/on to reset it.

    However now all is fixed and its running really well. Hopefully for the next 150k miles.

    Top marks to Vector Vehicle Systems in Northwich (Cheshire) who were great. Very professional, good value and whom I can thoroughly recommend as they know the A2 well.

    (Note: If anyone does require a new injector wiring loom I found them availavle here: http://www.darksidedevelopments.co.u...d-engines.html for 53. Turns out I didn't need one and you may get away with cleaning contacts)
    Last edited by Foghorn; 12-08-2017 at 10:55 AM.
    At the Annexe: 2004 TDI SE (90Bhp) Mauritius Blue, 16" 5 Spoke alloys, Satellite cloth, Parrot Bluetooth
    On the Drive: 2004 TDI SE Mauritius Blue, Black cloth, Concert II, CC, Parrot CK3000 Bluetooth (Fitted by Skipton) & 2003 TDI SE, Cobalt Blue, Black Leather, Sydmeko armrest, PDC, DIS, Alu Pack, S3 Leather Gear Shift, CC, Concert II, Parrot, Performance Discs, Stealth re-map. Bought from here courtesy of Havank.
    In the Garage: 1993 Porsche 964 Celebration. Polar Silver, Big Hips

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    rosscanning (14-08-2017)

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