Monster MotorsportVolks Autos
Results 1 to 14 of 14
  1. #1
    Reverse Gear

    Status
    Offline
    Join Date
    Sep 2011
    Posts
    20

    please help, loosing boost on my 1.9tdi

    right here goes, i'll try and explain this the best i can.

    when accelerating through the gears in my a4 avant tdi se (standard) it boosts fine, i go into 5th gear no problem, it boosts fine, then when i hit about 78mph it just dies, as if there is a limiter, it wont go over that speed, then when i slow back down to a junction etc and try and pull away there is no boost at all, but when i turn the engine off and turn it back on again everything is fine, someone told me it might be something to do with the accelerator pedal because it is electronic??? i have no idea what to do, can anyone help? thanks in advance. Neil Conlay

  2. # ADS
    ADS
    Join Date
    Always
    Posts
    Many
     
  3. #2
    5th Gear

    Status
    Offline
    Join Date
    Oct 2009
    Location
    Hull
    Posts
    1,442
    The car is going in to limp home mode you need to find out why it could be a number of things

  4. #3
    Widemonkeys's Avatar
    1st Gear

    Status
    Offline
    Join Date
    Aug 2010
    Location
    Durham, Durham, United Kingdom
    Posts
    274
    You need to get it scanned for fault codes, mine was doing it a few weeks ago and it was a pin head sized hole in the hose.
    02 A4 B6 1.9tdi Avant sport 130bhp, 18" RS4's, Cruise control, Armrest, Ambiant lights, LED number plate bulbs,Pressed number plates, rear RS4 ARB, blacked out grills.
    Wanted : S line front and rear bumpers , S4 lower grill, s4 door blades

  5. #4
    Reverse Gear

    Status
    Offline
    Join Date
    Sep 2011
    Posts
    20
    ok i'll get it scanned today and see what it comes up with, thanks.

  6. #5
    marktdisport's Avatar
    5th Gear

    Status
    Offline
    Join Date
    Jul 2011
    Location
    mids
    Posts
    1,193
    maybe turbo vanes need cleaning....
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  7. #6
    6th Gear

    Status
    Offline
    Join Date
    Nov 2009
    Location
    Lancaster
    Posts
    1,787
    Quote Originally Posted by marktdisport View Post
    maybe turbo vanes need cleaning....
    Agreed. Very likely. Got this on the A3.
    Atlas Grey A4 2.5 TDI Quattro Sport.
    Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
    To do: None yet.
    Next: Auto dip rearview mirror and Folding Mirrors.

  8. #7
    1st Gear

    Status
    Offline
    Join Date
    Sep 2010
    Posts
    167
    Id agree too, very common on the pd range, more likely will be a overboost fault code logged. Sticky turbo vanes seems to be the problem as long as everything else looks ok. Some people have managed to strip their turbos down and clean/ free them up with success, others replacement is necessary and ive read about kits u can get to clean them out without removing the turbo. When u turn the ignition off and on you reset the ecu and take it out of limp mode until it overboosts again. Its pretty dead when it happens !

  9. #8
    5th Gear

    Status
    Offline
    Join Date
    Oct 2009
    Location
    Hull
    Posts
    1,442
    Quote Originally Posted by quattro tony View Post
    Id agree too, very common on the pd range, more likely will be a overboost fault code logged. Sticky turbo vanes seems to be the problem as long as everything else looks ok. Some people have managed to strip their turbos down and clean/ free them up with success, others replacement is necessary and ive read about kits u can get to clean them out without removing the turbo. When u turn the ignition off and on you reset the ecu and take it out of limp mode until it overboosts again. Its pretty dead when it happens !
    havent others on here cleaned them with mr muscle oven cleaner and had good results?

  10. #9
    Reverse Gear

    Status
    Offline
    Join Date
    Sep 2011
    Posts
    20
    i scanned it and found no fault codes at all, my mechanic says it might be the data transfer box under the accelerator pedal? do you think this might be the case?

  11. #10
    5th Gear

    Status
    Offline
    Join Date
    Oct 2009
    Location
    Hull
    Posts
    1,442
    if its going in to limp home mode you should be getting a code up

    what was it scanned with ? vagcom or audi dealer tool or a hand held scanner

  12. #11
    6th Gear

    Status
    Offline
    Join Date
    Aug 2010
    Posts
    1,540
    sounds like an overboost fault.

  13. #12
    1st Gear

    Status
    Offline
    Join Date
    Sep 2010
    Posts
    167
    As above still. I would be looking at live data if u have vcds and seeing what the turbo boost is reading and if its within limits when the fault occurs. From my experience if the electronic throttle pedal goes faulty the glow plug light normally starts flashing and the car will just idle and do nothing else.

  14. #13
    Reverse Gear

    Status
    Offline
    Join Date
    Sep 2011
    Posts
    20
    i think it was just scanned with a hand held scanner, i dont have big money to take it to a main audi garage, there was no fault codes at all, would this rule out the accelarator pedal but could it still be that the vanos would need cleaning?

  15. #14
    5th Gear

    Status
    Offline
    Join Date
    Oct 2009
    Location
    Hull
    Posts
    1,442
    I had mine scanned with a hand held scanner when I had boost problems and no codes yet with vagcom it came up

 

 

Similar Threads

  1. 1.9Tdi keeps loosing boost
    By doublem_1 in forum A3/S3 Forum (8L Chassis)
    Replies: 9
    Last Post: 28th February 2011, 17:53
  2. loosing boost again
    By mad max in forum A3/S3 Forum (8L Chassis)
    Replies: 5
    Last Post: 30th August 2010, 20:12
  3. 1.9TDI Loosing Boost Power
    By doogleman in forum Audi S4/A4/A4 Cab (B7 Chassis)
    Replies: 3
    Last Post: 7th April 2010, 19:05
  4. Loosing boost after a while on my S3
    By Beenie in forum General Technical / How To
    Replies: 3
    Last Post: 2nd May 2008, 10:00
  5. Loosing All Turbo / Power!! 96 A4 1.9tDi
    By imported_Audi_DavE in forum A4/S4 forum(B5 Chassis)
    Replies: 4
    Last Post: 15th December 2005, 08:55

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