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Thread: 1.8t Holding Back Please Read

  1. #1
    A3-Lee's Avatar
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    1.8t Holding Back Please Read

    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 by A3-Lee; 6th October 2013 at 23:46.

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  3. #2
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    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?

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    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

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    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.
    S3 Big Turbo

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    Will scan it when I get to work tomorrow but all advice is greatly appreciated

  7. #6
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    Let me know if you fancy a logging session Lee, or just try and drive her staying below 3k revs! Pop pop bang bang!
    vivalacoulter likes this.



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
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  8. #7
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    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

  9. #8
    jojo's Avatar
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    Quote Originally Posted by A3-Lee View Post
    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
    N75 is knackered?



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
    You've got to have a laugh! For Sale:LCR Brakes - £400



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    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????

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    a3

    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

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    whats an n75 ? please anybody have a similar problem with my 1999 s3 since its been remaped

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    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

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    2nd gear sorts em out

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    where is the n75 valve situated on the car and where can i get a replacement from ?

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    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.

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    2nd gear sorts em out

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    could somebody post a picture of this please would make it a little easier thanks

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    fuel (pump) had its day check with fuel pressure gauge
    Audi s3 8l 2003 silver,brembo brakes,custom front mount intercooler,forged rods,acl race bearings,3inch tip,forge 007p green spring 1 shim,5mm hubcentric spacers,pipewerx 3inch down pipe/200cell race cat,2.75 miltek back non resonated,new piston rings,n249delete,pcv venting too atmosphere,neuspeed quick shifter,uprated clutch/pressure plate...large port agu head,inline fuel pump

    work left/relentless v3 manifold/wmi/blue haldex/antilag/launch controll/custom map!!!!!

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    is the n75 valve a dealer part only ?

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    Not sure we have a andrew page and a euro car parts round here think they stock them or on eBay

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    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.

  22. #21
    jojo's Avatar
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    Quote Originally Posted by jay22s3 View Post
    is the n75 valve a dealer part only ?
    Dealer or TPS.



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
    You've got to have a laugh! For Sale:LCR Brakes - £400



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    Throttle body?

  24. #23
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    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
    A3-Lee likes this.

    Audi s3 goodwood green, BAM, n249 delete, 80mm TIP, s2000 air-filter, new turbo, ap coil overs, lots of poly bushes, 15mm spacers all round rolling on 18'' RSTT's

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    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

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    finally found my issue it was the fuel pump in the tank runs sweet as a nut now

 

 

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