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smokin

Discussion in 'A4/S4 forum(B5 Chassis)' started by olds_kool, Oct 16, 2009.

  1. olds_kool
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    olds_kool Active Member

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    hi
    i spent the day 'fixing' my new car (1.8t apu engine)
    bought it in need of a new turbo so i got a used one, no play and no sign of oil leaks
    when i finally got it all bolted together i started it up, after about 30 seconds it started smoking, smells oily but appears thick white ran it for about 5 mins and no difference so i had to turn it off before someone complained
    tried it again for 5 mins once cloud had cleared but it was the same
    at this point it was going dark so ive packed and ill try again early tommorrow, im now worried it wont clear but im still pretty sure turbo is ok

    will it clear?, should i just give it longer? anything else i should check? any ideas? any quick test of head gasket? or should i just start breaking it?

    cheers in advance, kev
    #1
  2. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    Whe i changed my turbo after blowing the previous one it took me a good half hour and about 5 miles before it cleared enough to use. Once it cleared out it was all good. Was the IC clear?

    If the "new" turbo is a known good one i would give her more of a chance mate.

    The HG will usually exibit with pressure in the pipes etc no reason to assume that, was she full of water/G12 or drained where they removed the turbo?
    #2
  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    the exhaust/cat/etc will be full of oil.

    If its drivable then get it onto a fast a-road or duallie and blow out the cobwebs...
    #3
  4. SonicDeathmonkey
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    SonicDeathmonkey Member

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    Or use it for a bank job and make a clean get-away while hidden in your cloud of smoke!
    #4
  5. olds_kool
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    olds_kool Active Member

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    might be being a bit paranoid, cheers
    coolant and oil where completly drained, i cleaned all the pipes yesterday and left car on stands, oil poured out of i/c but just left it to drip overnight

    he'd removed manifold, cat and downpipe?! and i had a nightmare getting them back on (still only managed to get 2 bolts into cat/downpipe)
    #5
  6. rasA4
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    rasA4 Four Rings Mafia Specialist

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    may be totally unrelated, when the EGR valve was changed on my wifes 2001 corsa the car was smokin for about 10-15 miles, may be not as bad as yours but is was definatley noticeable, then all cleared up after that.
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  7. rasA4
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    rasA4 Four Rings Mafia Specialist

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    any updates, olds?
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  8. olds_kool
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    olds_kool Active Member

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    i suspect head gasket has gone, it runs smokeless for 20 mins on tickover then thick white smoke, not got around to doing a compression test as mrs went shopping for catering stuff for the pub and came home with an mx5 (mk1 1.6 eunos import) so ive been tinkering with that, its noisy, full of rattles, its slow but it puts a stupid grin on your face when you corner and get the back end to slide out
    so anyway probably going to break the avant
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  9. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    smoke or steam?

    What does the reek smell like?
    #9
  10. docurley
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    docurley Moderator Staff Member Moderator

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    White solid smoke tends to point to the Turbo. White vapour tends to be the Head gasket but are you sure the exhaust and intercooler is clear of Oil?
    #10
  11. olds_kool
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    olds_kool Active Member

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    id say its smoke, smells horrible but not oily
    just wondering why it takes 20 mins to show
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  12. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    I had an engine with cracked valve guides that belched whitey-grey smoke. Its odd because you'd expect oil to burn blue, but it certainly looked mostly white, and i suspected the head gasket, but on stripdown it turned out to be the guides.

    Turbo oil seals could do something similar i guess.

    You say it appears after 20mins of idling, what happens if you start it from cold and actually drive the thing? Maybe its just taking 20mins for the exhaust/cat etc to heat up enough to start cooking off the oil thats been dumped into there?
    #12
  13. olds_kool
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    olds_kool Active Member

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    cars been sorn for 2 years and got no insurance so cant risk driving it if its going to attract attention with smoke
    if it was turbo or guides would it appear sooner?
    #13
  14. adamss24
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    adamss24 Active Member

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    Old skool, it takes about 20min on a diesel to get the cat hot enough to start burning the oil inside and little oil makes a lot of smoke. On a petrol engine i believe its gonna take less than that. Head gasket will pressurize the system in no time and it will boil but it could be a craked head as well wich only manifests when engine gets hot and water gets sucked in the cylinders and blown trough the exhaust. Either way is a big gamble...
    #14
  15. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    If you cant drive it, what happens if you start it and hold it at 3krpm?

    Also, if its belching out something you suspect to be water, has the coolant level dropped at all?
    #15

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