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Glow plug problem costing me a fortune trying to find cause

Discussion in 'A3/S3/Sportback (8P Chassis)' started by chale989, Feb 8, 2013.

  1. chale989
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    chale989 Member

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    [Feb 8, 2013]
    Ok so i have a 2005 2.0 tdi but when i turn the key the glow plug light will not go out.

    I have 2 options , turn the key 15-20 times or sit and wait for 5-10 minutes and the light will go off itself.

    I have so far replaced all 4 glow plugs , put in a brand new battery and had the key re programmed.

    Any Ideas anyone?

    Once the engine is warm, if i turn it off and then turn key then the lights will go straight off. Its usually when engine has been standing for longer then 10 minutes.
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  3. chale989
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    chale989 Member

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    [Feb 8, 2013]
    Guys i really need advice. Ive had diagnostics ran 3 times from 3 different places and nothing shows
    #2
  4. Sidhu88
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    Sidhu88 Active Member

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    [Feb 8, 2013]
    U sure its the glow plugs? As in, isit a solid light or does it flash? If it flashes could be a maf or lambda issue, mine would flash before hittin limp mode when my maf was on its way out. Also one time the turbo was having a once over we ran the car with no intake pipe on the turbo and it flashed continuously too.
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  5. Sidhu88
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    Sidhu88 Active Member

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    [Feb 8, 2013]
    Also what plugs did u replace it with? Oem?
    #4
  6. Lewis583
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    Lewis583 Active Member VCDS Map User

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    [Feb 8, 2013]
    I'm guessing you have had the car scanned with a decent diag tool? VCDS would be preferable. Fault codes?
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  7. mike foster
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    mike foster Fossie VCDS Map User

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    [Feb 9, 2013]
    Glow plug wiring harness has been known to cause intermittent problems.
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  8. chale989
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    chale989 Member

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    [Feb 9, 2013]
    Plugs were replaced by bosch ones that were reccomended.

    Scans have been done by audi , the aa and a vw speciliast garage.

    How much is a new glow plugs wiring harness?

    The light stays light, not flashing.

    $once engine is on then there are no issues what so ever. No limp mode or any warning lights
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  9. BradV6
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    BradV6 Member

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    [Feb 9, 2013]
    Can the glow plug relay cause a problem? I remember something like this on my MK4 golf
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  10. 964kevin
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    964kevin Member

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    [Feb 9, 2013]
    What triggers the Glow Plug to come on? thats where I would be looking.... Temp sensors etc.

    Kevin
    #9
  11. chale989
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    chale989 Member

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    [Feb 9, 2013]
    There are no triggers what so ever. Just sit and wait 5 mins or so and it a click noise happens and then it will go off.
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  12. mike foster
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    mike foster Fossie VCDS Map User

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    [Feb 9, 2013]
    Glow plug wiring harness is approx. £100
    #11
  13. NHN
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    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    [Feb 11, 2013]
    Yeap I would test glowplug loom as known to be a problem on some, clicking is probably relay for the glowplug system would need to check schematics to confirm.
    #12

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