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2.0 tdi 170 smoke on idle

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Cupra neil, Nov 4, 2012.

  1. Cupra neil
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    Cupra neil New Member

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    Hi I've just bought a 56 170 s-line and I have noticed that if I leave it to idle for a while only when the engine is cold it smokes quite heavy, white/grey fuel smoke I was thinking possible dodgy injector. Has anyone else had this fault?
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  2. fossie
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    fossie Member

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    Could just be the cold weather buddy - both ours are doing as well
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  3. VagCabby
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    VagCabby Member

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    As said proberly just condensation, all cars do it on cold mornings, warm air from the engine hitting the cold air outside. I wouldn't worry about it
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  4. Purdy99
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    Purdy99 Member

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    Mine does that to, but i just thought being the 170's and having the dpf fitted, its the DPF de clogging itself i always thought anyways.... not saying i'm correct lol

    also! i just had the injector mod done about 4 months ago, and still smokes when cold, (not all the time tho)
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  5. Cupra neil
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    Cupra neil New Member

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    I'm going to try a injector harness tonight as audi said they are common I will let you know if its a success or not
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  6. Purdy99
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    Purdy99 Member

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    i hope it works for you, would be interesting to see if maybe mines playing up aswell then,
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  7. Cupra neil
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    Cupra neil New Member

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    Still does it, going to check the injector values tomorrow, I don't think it's dpf regenerating I've never known a car do it on idle or when engine is cold
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  8. Cupra neil
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    Cupra neil New Member

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    Looking on google there's loads of them do it and no one has got to the bottom of it
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  9. Purdy99
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    Purdy99 Member

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    ah, sorry to hear that didnt work, really? common fault then it seems, i hope someone finds out what it is!
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  10. Rick @ Unicorn Motor Dev.
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    Rick @ Unicorn Motor Dev. Site Sponsor Site Sponsor

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    You need to establish if it is condensation or smoke. With a DPF fitted it is unlikely to be smoke.

    Rick
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  11. Cupra neil
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    Cupra neil New Member

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    It was smoke, made you eyes water it was that strong, put a blanking plate on the egr and its been spot on for 4 days now. no lumpy idle and better on fuel. Found the egr to be sticking open very slightly. Getting the car remapped anyway so going to get it mapped out
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  12. fossie
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    fossie Member

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    Neil, did you have any issues when the EGR delete was fitted - im thinking of doing this to mine but cant afford to get it mapped out straight away
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  13. Rick @ Unicorn Motor Dev.
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    Rick @ Unicorn Motor Dev. Site Sponsor Site Sponsor

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    It will go into Limp after a while if it is just blanked.

    Rick
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  14. fossie
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    fossie Member

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    So you need it mapped out - i was going to get the allard delete kit, i thought using this would only throw up the e/m light
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  15. Cupra neil
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    Cupra neil New Member

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    Eml come on after a few days but drives fine, I'm going to get it mapped out
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  16. Purdy99
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    Purdy99 Member

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    ah right, i've had mine mapped not, wooo, but am just about to put not a blanking plate, but a restricting plate on the EGR, would that bring up any faults even tho its been mapped? (and dpf delete)
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  17. tubby
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    tubby Member

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    mine a 170 07 does this sometimes not all the time a im a mechanic myself its really fuely the smell makes eyes sting and really lumpy /misfiring on idle the give it a blast it clears its defo fuel i thought egr any ideas id like to know.also had the injectors and harness done with audi in dec 2011....steve
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  18. Rick @ Unicorn Motor Dev.
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    Rick @ Unicorn Motor Dev. Site Sponsor Site Sponsor

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    EGR valve, get it blanked and mapped out.

    Rick
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  19. csm
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    csm Member

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    My car did this a few days ago and again today the smoke would make your eyes water.......... it had a brand new siemens egr valve fitted only a few thousand miles ago. So surely must be something else ?
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  20. northtim
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    northtim New Member

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    Mine has done it on and off for ages, most noticeable when cold. Always juddery when cold, doesn't often smoke but regularly smells of diesel. EGR valve was replaced in December and made no difference. Injectors were done by Audi about 2.5 yrs ago. Once warmed up it usually runs well and smooth.

    Indy garage has done reading and says it is something with injectors but didn't sound very confident. Injectors leaking diesel at wrong part of cycle? Said could mean injector/injectors replacing again, or harness, or something re camshaft. All sounds like ££££ and as Turbo now playing up I have decided to get rid. Turbo can be sorted but injectors can get very expensive and I just can't risk that on a car that is knocking on in age and lowish value now.

    Good luck finding the cause, I haven't managed to find a solution despite trawling these forums. Similar symptoms but what works for one doesn't seem to work for another so it is a bit of a lottery.
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  21. csm
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    csm Member

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    Well i just serviced my car again yesterday as it was due and i was intending selling my car anyway as i would rather just run about in a older car worth about £1500-£2k that way the paranoia of the idiots in asda car parks etc etc is no more or a care in the world about miles on the clock, i do 25k per year so to have a exspensive car can quickly loose a fortune in value if they rack up the miles.

    I do have the benefit of my mates snap on diagnostics and it all comes back as good and my dpf filter is fine and re-gens when it should etc etc god knows with these 2.0 tdis though they deffo seem weird compared to the 1.9s ive owned in the past with never a problem.
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  22. eddscott
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    eddscott Member

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    I know this is an old thread but I've noticed my 170 smoking a bit when I first start it. I tend to start the car about 10 mins before leaving the house in the morning and when going to the car it does seem to be a bit smokey - more so than I remember anyway.

    Smoke looks a bit blue too but not sure what that means. Car has had the injectors and loom changed 2 years ago under warranty. Has had DPF and EGR removed and turbo is about 18 months old.

    Doesn't do anything else untoward so not too worried.
    #22

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