1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

1.8t Holding Back Please Read

Discussion in 'A3/S3 Forum (8L Chassis)' started by A3-Lee, Oct 6, 2013.

  1. A3-Lee
    Offline

    A3-Lee Active Member

    Joined:
    Dec 11, 2011
    Messages:
    462
    Likes Received:
    45
    [Oct 6, 2013]
    When driving my car and giving it some when i change from 2nd to 3rd at high rpm and accelerate again the car holds back almost like bogging down, if i release the pedal an plant it again it usually clears ,if i keep my foot down it results in sometimes popping from the engine bay.

    The cars a 1999 A3 1.8t Agu

    My thought was my fuel pump may need changing its done 148,000 any input greatly appreciated thanks in advance

    Lee
    Last edited: Oct 6, 2013
    #1
  2. Ads

    Ads

    [Sep 20, 2014]

  3. rustynlc
    Offline

    rustynlc Member

    Joined:
    Jul 5, 2011
    Messages:
    141
    Likes Received:
    9
    [Oct 6, 2013]
    Hi, if your getting air bursts I'd check the boost pipes, if they are leaking or split that could possibly result in hesitation and air leaks, check for splits cracks along the pipes and also were the jubilee clips sit, I'm sure someone else will be along shortly to give you some more advice, does it hesitate when just booting it hard or in all manners of driving?
    #2
  4. A3-Lee
    Offline

    A3-Lee Active Member

    Joined:
    Dec 11, 2011
    Messages:
    462
    Likes Received:
    45
    [Oct 6, 2013]
    Only when booting it hard when I change from second to 3rd around 6000rpm it splutters an like holds back then let off plant it again and it usually goes all boost pipes are fine no leaks
    #3
  5. sean_s3
    Offline

    sean_s3 Member

    Joined:
    May 10, 2009
    Messages:
    266
    Likes Received:
    2
    [Oct 6, 2013]
    Scan for fault codes if you can. Holding back at high revs could be a fueling issue . I've had this before when having problems with EGT's running high causing the ecu to dump fuel.
    #4
  6. A3-Lee
    Offline

    A3-Lee Active Member

    Joined:
    Dec 11, 2011
    Messages:
    462
    Likes Received:
    45
    [Oct 6, 2013]
    Will scan it when I get to work tomorrow but all advice is greatly appreciated
    #5
  7. jojo
    Online

    jojo S3 Drift King! Staff Member Moderator

    Joined:
    Sep 4, 2003
    Messages:
    26,224
    Likes Received:
    1,668
    [Oct 7, 2013]
    Let me know if you fancy a logging session Lee, or just try and drive her staying below 3k revs! Pop pop bang bang! :laugh:
    #6
    vivalacoulter likes this.
  8. A3-Lee
    Offline

    A3-Lee Active Member

    Joined:
    Dec 11, 2011
    Messages:
    462
    Likes Received:
    45
    [Oct 7, 2013]
    Right noticed on my way to work today when this happens my boost gauge goes up to around 18 psi rather than the usual 10 psi any ideas anyone
    #7
  9. jojo
    Online

    jojo S3 Drift King! Staff Member Moderator

    Joined:
    Sep 4, 2003
    Messages:
    26,224
    Likes Received:
    1,668
    [Oct 7, 2013]
    N75 is knackered?
    #8
  10. temp
    Offline

    temp Member

    Joined:
    Oct 2, 2013
    Messages:
    65
    Likes Received:
    0
    [Oct 9, 2013]
    Hi did you find out what it was I have a 1999 s3 and it does the same had it into 1 garage and he says it sounds like the turbo is knackered. But to me I think it's not that major because when the car goes the turbo works ok. And mine is also over boosting????
    #9
  11. willmad89
    Offline

    willmad89 Member

    Joined:
    Oct 28, 2013
    Messages:
    48
    Likes Received:
    0
    [Oct 28, 2013]
    im having similar trouble i have a a3 1999 agu when i accelerate hard normally 3rd gear and get to around 4 to 5thousand revs mine boggs down like a misfire only for a split second and sorts itself out, its quite annoying, i have a mate with agu engine so i have tryed coil pack, airflow meter, ignition module, iv changed plugs, air filter, and battery checks for leaks and splits and seems fine, next step fuel filter and try n75 hopefully one of these, iv hurd injectors can cause these symtoms if i sort it i will post back
    #10
  12. jay22s3
    Offline

    jay22s3 2nd gear sorts em out

    Joined:
    Jan 29, 2013
    Messages:
    165
    Likes Received:
    3
    [Oct 28, 2013]
    whats an n75 ? please anybody have a similar problem with my 1999 s3 since its been remaped
    #11
  13. Nilz
    Offline

    Nilz Defo worth the wait :)

    Joined:
    Apr 9, 2006
    Messages:
    10,255
    Likes Received:
    403
    [Oct 28, 2013]
    Its the N75 valve mate, I had the same thing on mine a few months ago, exactly the same where you had the power, if you lift off and plant it again the power came back.

    Changed the N75 and we were back in business :)
    #12
  14. jay22s3
    Offline

    jay22s3 2nd gear sorts em out

    Joined:
    Jan 29, 2013
    Messages:
    165
    Likes Received:
    3
    [Oct 28, 2013]
    where is the n75 valve situated on the car and where can i get a replacement from ?
    #13
  15. temp
    Offline

    temp Member

    Joined:
    Oct 2, 2013
    Messages:
    65
    Likes Received:
    0
    [Oct 29, 2013]
    N75 is just next to ya MAF with a pipe leading from the intake and 2 more pipes going to it. Yes going to replace when I have the chance.
    #14
  16. jay22s3
    Offline

    jay22s3 2nd gear sorts em out

    Joined:
    Jan 29, 2013
    Messages:
    165
    Likes Received:
    3
    [Oct 29, 2013]
    could somebody post a picture of this please would make it a little easier thanks
    #15
  17. temp
    Offline

    temp Member

    Joined:
    Oct 2, 2013
    Messages:
    65
    Likes Received:
    0
  18. darren t
    Offline

    darren t Member

    Joined:
    Sep 7, 2012
    Messages:
    370
    Likes Received:
    1
    [Oct 29, 2013]
    #17
  19. jay22s3
    Offline

    jay22s3 2nd gear sorts em out

    Joined:
    Jan 29, 2013
    Messages:
    165
    Likes Received:
    3
    [Oct 29, 2013]
    is the n75 valve a dealer part only ?
    #18
  20. temp
    Offline

    temp Member

    Joined:
    Oct 2, 2013
    Messages:
    65
    Likes Received:
    0
    [Oct 29, 2013]
    Not sure we have a andrew page and a euro car parts round here think they stock them or on eBay
    #19
  21. boost-addict
    Offline

    boost-addict Member

    Joined:
    Aug 22, 2011
    Messages:
    979
    Likes Received:
    35
    [Oct 30, 2013]
    i had this problem, it felt quicker at 2/3rds throttle from full throttle to 2/3rds felt like a boost!. but my clutch started slipping before i could investigate further.
    #20
  22. jojo
    Online

    jojo S3 Drift King! Staff Member Moderator

    Joined:
    Sep 4, 2003
    Messages:
    26,224
    Likes Received:
    1,668
    [Oct 30, 2013]
    Dealer or TPS.
    #21
  23. ticketyboo90
    Offline

    ticketyboo90 Member

    Joined:
    Oct 28, 2013
    Messages:
    30
    Likes Received:
    0
    [Oct 30, 2013]
    Throttle body?
    #22
  24. s3clarke
    Offline

    s3clarke Money grabbing s3!

    Joined:
    Jun 8, 2012
    Messages:
    677
    Likes Received:
    35
    [Oct 31, 2013]
    I think it must be that you have your seat to far back and when you accelerate in third you are being thrown backwards, meaning you cant plant your foot all the way :racer:
    #23
    A3-Lee likes this.
  25. willmad89
    Offline

    willmad89 Member

    Joined:
    Oct 28, 2013
    Messages:
    48
    Likes Received:
    0
    [Oct 31, 2013]
    still awaiting on a new fuel filter to come i should of went out and bought one hopefully should come today i ordered a bleed valve also to bypass the n75 ill post back to tell u how its gone
    #24
  26. willmad89
    Offline

    willmad89 Member

    Joined:
    Oct 28, 2013
    Messages:
    48
    Likes Received:
    0
    [Nov 1, 2013]
    finally found my issue it was the fuel pump in the tank runs sweet as a nut now
    #25

Share This Page