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car judders a bit on cold start up and then is fine once up to temp

Discussion in 'A3/S3 Forum (8L Chassis)' started by drfeelgood, Jul 14, 2010.

  1. drfeelgood
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    drfeelgood Member

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    [Jul 14, 2010]
    Hey guys, searched the fourms but cant find anything similar, other then anouther guy who said his car judders during all low rev range, the answer to that was the MAF?

    But anyway, on a cold start up the car seems to judder /hesitate a bit threw the entire rev range and into the high gears, however after a minute or so its fine. I'am thinking it might be this MAF sensor or maybe the brakes are locking up slightly and causeing it to judder and releasing a bit after driving , but the weather has been hot and there is no moisture in the air so i cant think it can be that.
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  3. GAudiTech
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    GAudiTech Member

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    [Jul 14, 2010]
    coolant temp sensor is likely cause of this. If its reading incorrectly and thinks the engine is warm when it is actually cold this will stop the fast idle causing the judder.
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  4. drfeelgood
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    drfeelgood Member

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    [Jul 14, 2010]
    The temp gauge on the dash seems to read correct though, or wouldent this matter?
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  5. GAudiTech
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    GAudiTech Member

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    [Jul 15, 2010]
    check the sensor and see if its black or green. Change it if it is black. The temp gauge does not give a true temp reading. Only way to properly check would be to have a look at the measured value block using VCDS to see what its reading. There was a point in my work were i was fitting at least one of these a day to 8L with the exact same problem. Its somewere to start and is the cheapest option
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  6. Dazboss
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    Dazboss Like A Thristy Dingo ;)

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    [Jul 17, 2010]
    Sounds like my problem too :(
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  7. Sandip
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    Sandip Well-Known Member

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    [Jul 17, 2010]
    Try primeing the fuel pump up a few times then start the car, seems to be working for me
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  8. drfeelgood
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    drfeelgood Member

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    [Jul 17, 2010]
    Audi can deal with it, have warrenty will use it lol
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  9. drfeelgood
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    drfeelgood Member

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    [Jul 28, 2010]
    Where do i find the coolant temp sensor on the car?
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  10. DJ_Troopa
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    DJ_Troopa K1 Driver

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    [Jul 28, 2010]
    My car was doing the same thing on start up until i read the other guys thread about it being the MAF. I checked my MAF readings when i got my liquid gauge and realised it was down. I bought a new MAF and the car has been fine since then.

    Have you tried unplugging the MAF and taking it for a wizz to see if it feels better? If it does feel better then it means you need a new one. I did the same thing and my car pulled alot better when i unplugged it!
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  11. finesse
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    finesse Active Member VCDS Map User

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    [Jul 28, 2010]

    lol this ain't 1952 sandi
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  12. Sandip
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    Sandip Well-Known Member

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    [Jul 28, 2010]
    :laugh:
    #11
  13. drfeelgood
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    drfeelgood Member

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    [Jul 29, 2010]
    To be fair it could just be me, the feeling of judder and hesitation is so small, how do i remove the maf, is it on the how to quide? I took it to audi, they couldent find anything wrong on the cold start up, so it might just be me being a prat lol
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  14. finesse
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    finesse Active Member VCDS Map User

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    [Jul 29, 2010]
    [​IMG]

    [​IMG]

    remove wiring connector
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  15. drfeelgood
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    drfeelgood Member

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    [Jul 29, 2010]
    Oh i have dealt with such things before on the astra, i will give this a try, nice to have something in such an easy place to get to
    #14

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