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A3 1.8T - Cold running problems

Discussion in 'A3/S3 Forum (8L Chassis)' started by jiffi77, Feb 10, 2006.

  1. jiffi77
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    jiffi77 Member

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    [Feb 10, 2006]
    Have the following running problem with my A3 1.8T, only happens when cold, the car hesitates/surges when using very light throttle ??
    I've just replaced the MAF, didn't have any effect on the problem although the car feels stronger throghout the rev range, also has the following fault code :- 17608 - Boost Pressure Control Valve (N249): Mechanical Malfunction
    P1200 - 35-00 - -
    Not convinced the above fault is anything to do with the cold running though, any help or info would be great.
    #1
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  3. HTC
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    [Feb 10, 2006]
    Currently having this issue with my AUM engined Golf (same as A3).

    Found the heating element for the post CAT lambda probe not functioning.

    Will be swapping out the probe shortly. I'll post if it makes a difference.
    #2
  4. jiffi77
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    jiffi77 Member

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    [Feb 10, 2006]
    [ QUOTE ]
    Currently having this issue with my AUM engined Golf (same as A3).

    Found the heating element for the post CAT lambda probe not functioning.

    Will be swapping out the probe shortly. I'll post if it makes a difference.

    [/ QUOTE ]

    Is this expensive ?
    #3
  5. Khufu
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    Khufu Well-Known Member

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    [Feb 10, 2006]
    That will depend on whether it comes out easy or not. It shouldnt be too dear but sometimes they seem to weld themselves into the exhaust!
    #4
  6. W8 Performance
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    [Feb 11, 2006]
    Let me know how you get on jiffi. I have a similar problem with mine. I had the throttle valve replaced at a stealer and then had the MAF done. Still does it when cold up to about 4000ish then pulls harder again. Very annoying!!!
    #5
  7. jiffi77
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    [Feb 12, 2006]
    Rob, did the throttle valve make any difference ??
    #6
  8. W8 Performance
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    [Feb 12, 2006]
    did make a little bit of difference. It stil does it though to a certain extent.
    #7
  9. starski4578
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    [Feb 12, 2006]
    I've been having the exact same problem and done all the usual like replaced the MAF. Really interested to know what cures this for you. Hope you get to the bottom of it soon. It must be a sensor but ive had a few changed. The problem is still there even though i can live with it it is a pain in the butt. Its only noticeable when its cold up to like u said 4000rpm ish when applying very light acceleration.
    #8
  10. jiffi77
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    jiffi77 Member

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    [Feb 22, 2006]
    [ QUOTE ]
    Currently having this issue with my AUM engined Golf (same as A3).

    Found the heating element for the post CAT lambda probe not functioning.

    Will be swapping out the probe shortly. I'll post if it makes a difference.

    [/ QUOTE ]

    Hi HTC did you have any luck changing the "Post Cat Lambda probe" , if so did it cure the problem ??

    Jeff.
    #9
  11. AL_B
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    AL_B Active Member

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    [Feb 22, 2006]
    We've got poor running problems with our Golf too...jerkiness when cold. Just not had time to investigate it due to investigating my S3's problems.

    I have uploaded some docs from the Elsawin Technical Service Handbook...see the links below...

    The first extract refers to "Jerky cold running"...and in turn references the second extract below.

    Jerkiness Poor Performance 1.8T and V6 Turbo

    Cleaning of Coked Engine Parts

    Hope they help.

    AL
    #10
  12. HTC
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    [Feb 22, 2006]
    Sorry, not had a chance to get involved yet.

    I did have a rethink the other day tho and I've decided to change the coolant temp sender and clean out the throttle body instead. Partly because I like to start cheap first and partly because even a faulty post cat lambda heat should make the car run like it is at the mo.

    Soonest I'll be able to work on the car is monday as I'm out of the country unitl then.

    I will post results for sure.
    #11
  13. starski4578
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    [Feb 24, 2006]
    Cant wait until someone gets to the bottom of this. I will be investigating it myself at the end of the month and i wont stop till its sorted. I'll be watching this post with great interest!
    #12
  14. HTC
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    [Feb 26, 2006]
    How cool is my girlfriend!

    She called me to say the car was playing up again and was getting on her nerves. I said I can't fix it till monday.

    She then said, wheres the parts? I'll do it!
    I was like, okay.....cool. I explained what to do and off she went.

    Anyways, she's swapped the coolant temp sender over and so far, so good. The car is behaving when cold. She went out early this morning as it was very cold and gave it another go. Again it was okay.

    When I get back home I'm gonna give it a once over with VAG-COM etc and if its fine for a week I'm going to say its cured.

    Clever girl!!! /ubbthreads/images/graemlins/ok.gif
    #13
  15. W8 Performance
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    W8 Performance Member

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    [Feb 26, 2006]
    can she come and do mine?
    #14
  16. HTC
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    [Mar 1, 2006]
    Update:

    The temp sensor has not cured the problem. Its still running wrong when really cold.

    If you pull away slowly and are slight with the throttle its fine, but if you give it a few more revs it will hesitate.

    After literally about 3 minutes the problem is gone.

    Plan B, time to replace the post cat lambda probe.
    #15
  17. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 1, 2006]
    [ QUOTE ]
    Update:

    The temp sensor has not cured the problem. Its still running wrong when really cold.

    If you pull away slowly and are slight with the throttle its fine, but if you give it a few more revs it will hesitate.

    After literally about 3 minutes the problem is gone.

    Plan B, time to replace the post cat lambda probe.

    [/ QUOTE ]

    Exact problem im having with my A3! I've ordered a new coolant sensor, and also a air temp sensor (the one in the TB). Going to change the thermostat too as it never gets to temp.

    Rich
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  18. HTC
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    [Mar 1, 2006]
    Thanks for pointing out the air temp sensor. I'll take a look at mine first before I buy anything else.
    #17
  19. jiffi77
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    [Mar 1, 2006]
    Let me know if any of these cure the problem, had one of the Temp sensors replaced on mine about a year ago didn't cure the problem, not sure which sensor was replaced I'll try and find out.

    Jeff.
    #18
  20. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 1, 2006]
    Its yet another bloody ripoff from Audi! £25+vat for a plug with a bit of wire in it! could prob make the bloody thing myself for £2!
    #19
  21. HTC
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    [Mar 1, 2006]
    I think I'll swap the air temp sensor from my A3 to the Golf. If nothing changes, then at least I won't have had to spend any cash.
    #20
  22. jiffi77
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    jiffi77 Member

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    [Mar 2, 2006]
    Does anyone have any picturers of what the Air-Temp sensor looks like, and is it easy to replace ??
    Would it be thye same as one fitted to a 98 Passat 1.8T, my A3 is a 2000 face-lift model ??
    #21
  23. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 2, 2006]
    [ QUOTE ]
    Does anyone have any picturers of what the Air-Temp sensor looks like, and is it easy to replace ??
    Would it be thye same as one fitted to a 98 Passat 1.8T, my A3 is a 2000 face-lift model ??

    [/ QUOTE ]

    probably!

    On the TB, there are 2 plugs, One with about 6 wires, and one with 2. Its the one with 2. The sensor is held in place by a hex bolt.

    Rich
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  24. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 2, 2006]
    [​IMG]
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  25. HTC
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    [Mar 2, 2006]
    Temp sensor is super easy to swap. Like rich says, its on the throttle body. You don't have to remove any engine covers and its right in front of you. One allen bolt and one connector.

    More info from the girlie today about the golf. It also misbehaves if the car has been idling for a while in traffic which is confirmed via a rich mixture error code.
    #24
  26. HTC
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    [Mar 3, 2006]
    Rich, I've just been on ECS's website and they offer replacement lambda probes for VERY good prices compared to VW/Audi.

    See here

    The site mentions these are for AWW & AWP engine codes which as far as I know are the US versions of the AUM and AUQ. My golf is AUM.

    Can you get these probes from them and if so, can you post a price?

    Ta.
    #25
  27. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 3, 2006]
    Kev,

    How much can you get them for here?

    Rich
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  28. HTC
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    [Mar 3, 2006]
    Both front and rear probes from VW are £105 each. Knowing my luck I'd probably need both!

    GSF say they can get them for about £60 but can't garentee oem fitment. I don't want any universal type probes.

    ECS have them for £25 for the front and £13 for the rear at todays exchange rate which seems to be very cheap!

    I'd consider ordering them direct as even with shipping its going to work out cheaper. Obviously easier to get them from you tho.

    I've put a post on VWVortex to try and confirm the part numbers are similar (unless anyone here has the US version of ETKA?)
    #27
  29. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 3, 2006]
    Well, from ECS, for both front and rear including taxes .etc (inc vat) works out at £78. MUCH cheaper than audi, despite them being sent 4000miles!!
    #28
  30. god_thats_quick
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    god_thats_quick Numptie of the highest order

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    [Mar 3, 2006]
    This is the thing that gets me, some of this stuff that ECS supply has clearly come form germany, bit it Bosch or Audi themselves but its cheaper for us to get it from the states than from within the EU - total pisstake in my opinion! I know next time I'm on holiday over there I'll be doing some shopping!
    #29
  31. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 3, 2006]
    Yep its ridiculous!

    Kev, can get them cheaper too if you arent in a hurry as can chueck them in the next bigger shipment.

    Rich
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  32. HTC
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    [Mar 3, 2006]
    Thanks for finding out for me Rich. I will order these from you as soon as I have a definate answer about whether they will work on my car. I think I'll call a mate at the dealership to see if he can cross reference with US part numbers.
    #31
  33. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 3, 2006]
    Ok no prob!
    #32
  34. HTC
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    [Mar 3, 2006]
    Right. Been talking to a few guys and it seems there are only two types of probe available in the US. A wide band 6 wire item and a 4 wire narrow band type.

    I've had a look a some service info and wiring diagrams and as far as I can tell the ECS items will fit my car.

    Rich, Do you need me to call or PM you about an order? I can wait for your next shipment as its not super urgent.
    #33
  35. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Mar 3, 2006]
    [ QUOTE ]
    Right. Been talking to a few guys and it seems there are only two types of probe available in the US. A wide band 6 wire item and a 4 wire narrow band type.

    I've had a look a some service info and wiring diagrams and as far as I can tell the ECS items will fit my car.

    Rich, Do you need me to call or PM you about an order? I can wait for your next shipment as its not super urgent.

    [/ QUOTE ]

    You have PM!
    #34
  36. jiffi77
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    [Mar 6, 2006]
    Does anyone have the part numbers for the "Coolant tempo-sensor" & "Air temp-sensor", so I can check which one was replaced on mine ??

    Jeff.
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  37. RichA3Turbo
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    [Mar 6, 2006]
    not sure of coolant, but temp sensor is '058 905 379'

    Rich
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  38. HTC
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    [Mar 6, 2006]
    Coolant temp sender - 059 919 501A
    #37
  39. jiffi77
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    [Mar 6, 2006]
    Cheers guys, I'll check to see which one was replaced.
    #38
  40. jiffi77
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    [Mar 7, 2006]
    Does anyone have any instructions for cleaning the Throttle-Body ??
    #39
  41. HTC
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    [Mar 7, 2006]
    There isn't really much to it. Remove all pipes and cable if fitted. Then remove throttle body via the four mounting bolts.

    Spray carb cleaner into the body and wipe out the gunk.

    Replacing is reverse of removal etc.

    Don't try to take apart the electric stepper motor.
    #40

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