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stupid car

Discussion in 'A3/S3 Forum (8L Chassis)' started by coatesy, Dec 7, 2011.

  1. coatesy
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    coatesy poking badgers with spoons

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    [Dec 7, 2011]
    car is been a gay lord.

    i have no idea what could be wrong with it, i drive the car like a granny and only get 26mpg but about 3 weeks ago i was getting 31mpg.

    when i come to a stop after driving the car throws a wobble and the idle fluxuates from 900 rpm to about 300rpm it just feels like the car is going to cut out all the time.
    [h=1]
    [/h]recently i have changed the spark plugs they where gaped to the same as what was already in the car, i changed the temp sender again since when i had it scanned at a garage the temp sender was reading that the engine was at -10 degrees so it was over fueling.

    any ideas anybody doing my head right in, car is an a3 (agu)
    #1
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  3. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 7, 2011]
    Ill be watching this thread closely, my mpg has drop from around 30 to 25 and ive been driving like a granny and my revs are dropping to 600 below and feels like it wants to cut out, doig my head in.
    #2
  4. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Dec 7, 2011]
    First question, did you use a genuine CTS sensor, or some **** from ECP or GSF etc?

    Idle hunting like you describe is often caused by an air leak.
    #3
  5. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 7, 2011]
    Car is still showing same 20hg that it did before my fault occured, doesnt seem to fluctuate either but ill check it again tonight to see what it does.
    #4
  6. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Dec 7, 2011]
    Use vagcom measuring blocks on the engine controller and see what the coolant temperature is sitting at with a hot engine.
    #5
  7. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 7, 2011]
    What block number is that aragorn.
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  8. Gavin G
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    Gavin G Member

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  9. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 7, 2011]
    Mines not even 12 month old and its a genuine bosch one.
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  10. coatesy
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    coatesy poking badgers with spoons

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    [Dec 7, 2011]
    my mafs been on for years could that be a problem and the sensor i put in was a genuine one from audi
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  11. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 7, 2011]
    Ill warm the car up and unplug it see what happens.
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  12. Paradox1
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    Paradox1 Active Member

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    [Dec 7, 2011]
    I got this problem sorted last week.for me it was a boost leak intercooler to turbo.check it out
    #11
  13. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 7, 2011]
    So you had exact same syptoms?
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  14. eddieantifreeze
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    eddieantifreeze Member

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    [Dec 8, 2011]
    i would've punted at leaking vac hose somewhere.....

    similar thing on a mates octavia vrs
    #13
  15. taylor1
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    taylor1 Member

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    [Dec 8, 2011]
    I had this prob on my last a3 and it was down to a cylinder leaking!! Hope it not that tho I'd start looking for a air problem
    #14
  16. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 8, 2011]
    Weird how it only happens when the engine is fully warmed up and temp is at 90.
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  17. coatesy
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    coatesy poking badgers with spoons

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    [Dec 9, 2011]
    ah this is weird because mine does it cold and warm, but it is alot worse when cold
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  18. coatesy
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    coatesy poking badgers with spoons

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    [Dec 11, 2011]
    so after checking all the pipes and tightening them all up a bit more my mpg has risen a little but i still have the crappy idle problem
    #17
  19. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Dec 11, 2011]
    Well ive had no look either mate :(. Im off friday so going to whip the bumper off if weather permits and check all round their!
    #18
  20. coatesy
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    coatesy poking badgers with spoons

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    [Dec 13, 2011]
    a little bit of an update still haven't sorted the crappy idle out but i did put some more air in my tires, i was looking at the inside of the petrol cap to see how much air i should of been putting in then i realized that the tires on my car are like 225/40/17 and the ones inside the petrol cap were alot smaller than what i have on soooo i boshed some more air in now my car is reading 28.7mpg.

    i dont really know whether it could of made the difference but any way it might of done.
    #19
  21. coatesy
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    coatesy poking badgers with spoons

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    [Dec 20, 2011]
    an other update i changed my fuel to super unleaded it has made a difference the car drives/feels better, also the crappy idle only happens now when the car is hot and been at running temp for a couple of miles.

    another thing could my electrics affect my idle say for instance i have my rear window button pressed in to demist my rear window the cars idle gets alot worse pretty much the same thing when i have my heaters on..
    #20

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