Monster MotorsportChris Nott
Page 2 of 2 FirstFirst 12
Results 41 to 48 of 48
Like Tree2Likes

Thread: S3 losing power/ not boosting

  1. #41
    1st Gear

    Status
    Offline
    Join Date
    Jul 2012
    Location
    East Grinstead/ forest row
    Posts
    104
    i had a simular problem on mine, it turned out to be a blown fuse, the breather pipe under the inlet manifold was popping open under presure and was pushing back on when not under pressure.

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #42
    Neutral

    Status
    Offline
    Join Date
    Aug 2003
    Location
    Scotland
    Posts
    45
    I fitted a new valve today, the one that sits on top of the cam cover and has 3 hoses connected to it and an electrical plug - is this the N75 or is the N75 valve the one on the airbox pipe that has 2 pipes, one going to the actuator? I am now back to where I was when I first started having problems. The car will boost and hold 15 PSI and then it will just completely drop off. Then it will boost to just 4 PSI, if I back off sometimes it will boost to 15 PSI again. It makes no difference if I disconnect the plug on the valve.

    With the old valve 95% of the time the car will only boost to 4 PSI. Rarely mid journey it will boost to 15 PSI again when accelerating but it hasn't had full boost when initially starting the car for probably a month now.

    So changing the valve improves things but does not resolve the problem. I'm worried that if I run it like this with the new valve it will end up like the old valve. If the valve I have replaced is not actually the N75 then can someone tell me what it is and what it does? I put the old one back on an straight away only 4 PSI.

  4. #43
    Neutral

    Status
    Offline
    Join Date
    Aug 2003
    Location
    Scotland
    Posts
    45
    The valve I replaced is on the left hand side of this photo, just above the middle, rectangular shaped

    http://www.tyresmoke.net/attachments/355941-N75.1.JPG

    Not the N75 then...

  5. #44
    Neutral

    Status
    Offline
    Join Date
    Aug 2003
    Location
    Scotland
    Posts
    45
    Quote Originally Posted by doughty29 View Post
    i had a simular problem on mine, it turned out to be a blown fuse, the breather pipe under the inlet manifold was popping open under presure and was pushing back on when not under pressure.
    Sorry just saw this, I've checked the breather that is under the middle of the inlet manifold and it is secure. The vacuum hoses at the left hand side seem to be good as well.

  6. #45
    1st Gear

    Status
    Offline
    Join Date
    Jul 2012
    Location
    East Grinstead/ forest row
    Posts
    104
    The part that was faulty was a breather pipe that had a push in style clip that would pop open under boost, could be a collapsed pipe, looks fine from the out side, but the inside collapses under pressure?

  7. #46
    Neutral

    Status
    Offline
    Join Date
    Aug 2003
    Location
    Scotland
    Posts
    45
    OK I found the problem, when I went to change the N75 valve it fell apart! I fitted a new valve today and now it holds boost but only boosts to 10 PSI max. I believe standard is 15 PSI? Do I need to adjust the actuator arm to increase the boost? I remember having to do that with my old Cavalier Turbo.

    Also the part number on my old sensor was 058906283, the new one is 06A906283E. Is this a modified/replacement part or could this be the reason the boost is low?

    Edit: Looks like the part number did indeed change - N75 boost valve, standard 058F original version VAG Products German Auto Spares - suppliers of VAG Febi Car Spare Parts

  8. #47
    RIP S3dave

    Status
    Offline
    Join Date
    May 2004
    Location
    nr Glos
    Posts
    7,195
    you should not need to adjust actuator no.. is n75 plumbed in correctly?
    n75 electrically off will confirm wastegate pressure (5psi the norm)
    **http://www.facebook.com/Badger5Ltd**

    NEW NEW NEW eShop now LIVE>
    www.badger5.biz

    Badger 5 Ltd, Queen Annes Gate, Oldends Lane, Stonehouse, Glos, GL10 2DG


    http://www.badger5.co.uk, Tel:01453822880
    bill@badger5.co.uk
    **NEW** Badger5 Section CLICK here>> http://www.audi-sport.net/vb/213-badger-5/

  9. #48
    Neutral

    Status
    Offline
    Join Date
    Aug 2003
    Location
    Scotland
    Posts
    45
    Pretty sure it is plumbed in properly, longest tube from the N75 goes in the air box pipe? By electrically off do you mean unplug it and then when I drive I should get 5 PSI?

 

 
Page 2 of 2 FirstFirst 12

Similar Threads

  1. A3 1.6i 1997 R losing power changing from 1st to 2nd.
    By godslounge in forum A3/S3 Forum (8L Chassis)
    Replies: 0
    Last Post: 16th February 2006, 20:13
  2. HELP ! A6 TDI 130bhp keeps losing power when accelerating
    By tfox in forum A6/S6/Allroad forum (C5 Chassis)
    Replies: 2
    Last Post: 15th November 2005, 09:48
  3. Losing Power
    By imported_selector007 in forum A3/S3 Forum (8L Chassis)
    Replies: 4
    Last Post: 23rd August 2004, 21:06
  4. Losing power on 2nd???? any ideas
    By HSM in forum A3/S3 Forum (8L Chassis)
    Replies: 2
    Last Post: 19th November 2003, 11:58
  5. does my intake make me lose power?
    By Baudiquattro in forum A4/S4 forum(B5 Chassis)
    Replies: 5
    Last Post: 24th July 2003, 09:53

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO