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idle problem fix

karls s3 Jul 2, 2011

  1. karls s3

    karls s3 Member

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    i have been looking for what has been causing my idle problem , revs drop and come back up and only dose this on idle when i pull up at lights. i have tryed every thing to sort this problem

    like cleaned throttle body and reset with vagcom
    also cleaned injectors
    changed plugs
    change coil packs x4
    air filter
    fuel filter
    lambda sensor 1 as i had vagcom fault code
    and changed egt sensor as i had fault code.

    all codes gone and not come back

    and i found how to get the idle to stable all the time all i done is unpluged the egt sensor and took it for a drive for a few days and its fine all the time , but what damage will it do if i leave it unpluged
    will the car overfuel
     
  2. sportquattro

    sportquattro Active Member

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    Check the vac hoses underneath the inlet manifold, mine had the same problem and this was the cause.
     
  3. karls s3

    karls s3 Member

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    Check them mate one had split so had to repair with silicone .
     
  4. Alex C

    Alex C Well-Known Member VCDS Map User Audi S3

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    cant be good driving around with the EGT unplugged. I am pretty sure will overfuel and you will loose power too. Your not considering driving it from now on with the EGT unplugged are you? Does the EML light not come on with the EGT unplugged?
     
  5. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Ive got the same problem. All vac lines replaced etc and nothings work! Dont think mines got a egt sensor as its a apy engine. Any ideas would be good!
     
  6. karls s3

    karls s3 Member

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    no pluged it back in and no eml light came on.
     
  7. karls s3

    karls s3 Member

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    If i hold the rev to 1000 rpm i get a popin from exhaust like its a slight miss fire i have tried disconnecting the maf and made no difference and brought on the tc light until i plug it in again
     
  8. Gavin G

    Gavin G Member Audi A4 S-line owners group saloon TDi

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    Faulty MAF?
     
  9. karls s3

    karls s3 Member

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    I un plug the maf made no difference
     
  10. beachbuggy

    beachbuggy Well-Known Member

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    I going to take a wild stab here as it sounds like you've already looked at the easy things.

    It sounds like especially with the poppin, that you have a leak in the inlet gasket or injector bungs. Drawing in etc air and causing the idle problems at misfires.

    Easy way to check and I used to use this on Dellorto carbs, is to spray WD40 around the inlet and injectors, covering well the area. If the problem goes away you have a leak from either the inlet gasket or injector bung, which are common to go.

    Worth a try.
     
  11. karls s3

    karls s3 Member

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    Good shout ill give that a try cheers ill order some new bungs and inlet gasket
     
  12. Sandip

    Sandip Well-Known Member

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    After changing the lambda has the fault gone or is it still there :sly:
     
  13. karls s3

    karls s3 Member

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    Gone mate had a fault for egt sensor as well and new parts been fitted and no fault codes since part fitted
     
  14. Sandip

    Sandip Well-Known Member

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    MAP sensor maybe??
     
  15. karls s3

    karls s3 Member

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    But will i get a fault code with map sensor if faulty
     
  16. beachbuggy

    beachbuggy Well-Known Member

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    And map sensor is for boost not vaccuum as you get at idle!
     
  17. vanilla_ice

    vanilla_ice Member

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    Is that the plastic seat in the inlet manifold the injector seals sit in? Have you got part numbers and prices?
     
  18. karls s3

    karls s3 Member

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    my maf plug only has four pins and the sensor has 5 and the plastic around pins is a bit broken
     
  19. IbanezDan51

    IbanezDan51 Member

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    Did you ever fix this? Im having exactly the same problem...
     

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