Notices
 

  

User Tag List

Thread: 2.5TDI Glow Plug/Starting Problem

Results 1 to 8 of 8
  1. 2.5TDI Glow Plug/Starting Problem 
    #1
    Join Date
    Dec 2014
    Location
    York, UK
    Posts
    2
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    Hello!

    I've been having an unusual problem with starting my 2004 A6 2.5TDI Quattro for a while now, which I believe to be related to the glow plugs.

    When the engine is completely cold (Not been driven for a day or so), I turn the ignition and the glow plugs run for about 10seconds, and then the car starts spot on. If I go to start my car up within a few minutes of switching it off, again it'll start fine. However if I go to start the car after it has being sat for a couple of hours (So engine is almost completely cold - but I'm guessing still a tiny amount of residual heat), the glow plug light comes on, and then goes off after about half a second (Even if I try running it a few times). At this point when I go to start my car it takes approximately 30-60seconds of turning over for it to start! (Which I find very disconcerting, especially when the start motor starts spinning slower and slower...).

    I've read about a glow plug relay causing starting issues, but it was all vague information in a different forum, so hopefully someone here might be able to help me solve this issue (Especially now that winter is coming.)

    Many Thanks,
    Jon
     
    0 0 0
     

  2. Re: 2.5TDI Glow Plug/Starting Problem 
    #2
    Join Date
    Oct 2015
    Location
    GB
    Posts
    513
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Quote Originally Posted by Zinraf View Post
    Hello!

    I've been having an unusual problem with starting my 2004 A6 2.5TDI Quattro for a while now, which I believe to be related to the glow plugs.

    When the engine is completely cold (Not been driven for a day or so), I turn the ignition and the glow plugs run for about 10seconds, and then the car starts spot on. If I go to start my car up within a few minutes of switching it off, again it'll start fine. However if I go to start the car after it has being sat for a couple of hours (So engine is almost completely cold - but I'm guessing still a tiny amount of residual heat), the glow plug light comes on, and then goes off after about half a second (Even if I try running it a few times). At this point when I go to start my car it takes approximately 30-60seconds of turning over for it to start! (Which I find very disconcerting, especially when the start motor starts spinning slower and slower...).

    I've read about a glow plug relay causing starting issues, but it was all vague information in a different forum, so hopefully someone here might be able to help me solve this issue (Especially now that winter is coming.)

    Many Thanks,
    Jon
    The starter turns slower on the final 30-60 seconds attempt,

    I would say check the battery voltage first with a multimeter, as old battery cells die in the cold wether. You should see 12.5-14.5 volts on a good battery for start up.

    I know you say the car starts first time every morning but I'm wondering if the car battery losses charge fast on short journeys rather than long, so give a multimeter a try first to rule out the battery.

    Also a worn starter can withdraw too much current and spin the starter motor slowly preventing the engine turning fast enough, so you could check that current too which will be between 13.5-14.5 for a decent healthy current.

    The other problem is it could the glowplugs, when worn they take longer to heat up but usually the light stays on longer and actually modern combustion engines are very rarely affected by the gp's nowadays as the combustion chambers create plenty of heat those self.

    I'm thinking more along the lines of the battery or starter motor.


    Sent from my iPhone using Tapatalk
     
    0 0 0
     

  3. Re: 2.5TDI Glow Plug/Starting Problem 
    #3
    Join Date
    Oct 2015
    Location
    GB
    Posts
    513
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Also check all connections between the battery and starter are clean and good


    Sent from my iPhone using Tapatalk
     
    0 0 0
     

  4. Re: 2.5TDI Glow Plug/Starting Problem 
    #4
    Join Date
    Mar 2014
    Location
    Aylesbury Bucks
    Posts
    210
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)
    A TDI engine should start without glow plugs unless the air temperature is well below freezing. If it needs glow plugs, then they are masking another fault.
    No TDI I have owned, or used or been driven in has needed glow plugs.
    My A6 AKE engine glow plugs have all blown, and been like that for many years, and it starts virtually smoke free every time first go. It does take a couple of goes to start it when minus 5 or colder!
     
    0 1 0
     

  5. Re: 2.5TDI Glow Plug/Starting Problem 
    #5
    Join Date
    Jan 2015
    Location
    Israel Kfar uriya
    Posts
    208
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by Zinraf View Post
    Hello!

    I've been having an unusual problem with starting my 2004 A6 2.5TDI Quattro for a while now, which I believe to be related to the glow plugs.

    When the engine is completely cold (Not been driven for a day or so), I turn the ignition and the glow plugs run for about 10seconds, and then the car starts spot on. If I go to start my car up within a few minutes of switching it off, again it'll start fine. However if I go to start the car after it has being sat for a couple of hours (So engine is almost completely cold - but I'm guessing still a tiny amount of residual heat), the glow plug light comes on, and then goes off after about half a second (Even if I try running it a few times). At this point when I go to start my car it takes approximately 30-60seconds of turning over for it to start! (Which I find very disconcerting, especially when the start motor starts spinning slower and slower...).

    I've read about a glow plug relay causing starting issues, but it was all vague information in a different forum, so hopefully someone here might be able to help me solve this issue (Especially now that winter is coming.)

    Many Thanks,
    Jon
    I do not think it's a problem of glow plugs, It is more likely that the Ignition timing valve in the Injection pump Gets stuck.
     
    0 0 0
     

  6. Re: 2.5TDI Glow Plug/Starting Problem 
    #6
    Join Date
    Jul 2011
    Location
    Norway
    Posts
    1,176
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    It is more likely that the Ignition timing valve in the Injection pump Gets stuck.
    But when he starts from cold the timing piston works fine ? I,ve had exactly this fault and it turned out to be a faulty VP44 injection pump. .
    The one thing you can do is to advance the timing a couple of degrees and check the fuel supply to the injection pump ( tank pick up, fuel filter, thermostatic valve on filter) If that don't do it, you need a new injection pump ( or at least new seals in the old one)
     
    0 0 0
     

  7. Re: 2.5TDI Glow Plug/Starting Problem 
    #7
    Join Date
    Nov 2017
    Location
    Highlands
    Posts
    150
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    15 Post(s)
    Quote Originally Posted by bluezie View Post
    A TDI engine should start without glow plugs unless the air temperature is well below freezing. If it needs glow plugs, then they are masking another fault.
    No TDI I have owned, or used or been driven in has needed glow plugs.
    My A6 AKE engine glow plugs have all blown, and been like that for many years, and it starts virtually smoke free every time first go. It does take a couple of goes to start it when minus 5 or colder!
    althought the glow plug light comes on all of the time--they dont start to heat unless it is below 5*
     
    0 0 0
     

  8. Re: 2.5TDI Glow Plug/Starting Problem 
    #8
    Join Date
    Jul 2007
    Location
    glasgow
    Posts
    1,466
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    21 Post(s)
    For me its back to basics and tonights UK wide frost will be a good test

    1) Check battery for dud cell (s) for free
    2) Check cranking speed of starter
    3) Consider new glow plugs ...................... the light should not stay on for 10 seconds
    VW POLO 2002 1.2 12v , Audi A6 2006 2.0 TDi SE , Skoda Fabia 1.4 TDi

    All 3 cars in the current fleet
     
    0 0 0
     

Similar Threads

  1. Please Help '99 2.5TDi won't start. Glow plug light flashing
    By wanstronian in forum Audi A4 - B5 Forum - 1995 - 2002
    Replies: 3
    Last Post: 02-07-2012, 02:10 PM
  2. Question A4 2.5TDI Glow plug waning flashing
    By davejohnvr in forum Audi A4 - B6 Forum - 2002 - 2005
    Replies: 2
    Last Post: 31-05-2012, 11:12 AM
  3. transporter 2.5tdi 2003 glow plug light not staying on?
    By vanrental in forum The Commercial Range
    Replies: 7
    Last Post: 09-06-2009, 04:44 PM
  4. late model T4 glow plug 2.5TDI
    By t4owner in forum The Classic VW's
    Replies: 4
    Last Post: 31-01-2008, 06:44 PM
  5. 1995 A6 2.5Tdi glow plug flashing - help please
    By hwells in forum Audi A6 - C4 Forum - 1994 - 1997
    Replies: 4
    Last Post: 01-07-2007, 05:17 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  




  



Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.


VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.


Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.


All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


PLEASE NOTE - PERSONAL ABUSE, ABUSE AGAINST THIS OR ANY OTHER WEBSITE OR ANY COMPANY WILL NOT BE TOLERATED. OFFENDERS WILL BE MODERATED OR EVEN BANNED.


This website and forum are best viewed at a minimum resolution of 1024 by 768.



  



- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - VW Audi Forum -


- www.vwaudiforum.co.uk - www.vwaudiforum.co.uk -