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When do you Change Glow Plugs

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by jay786, Feb 22, 2012.

  1. jay786
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    jay786 Member

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    [Feb 22, 2012]
    How do you know when your glow plugs need to be changed?

    Whats the purpose of a glow plug?

    Thanks
    #1
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  3. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Feb 22, 2012]
    The glow plugs pre-heat the chamber to enable the diesel to combust easier as it enters the cylinder.

    They're normally replaced when the car turns over several times before starting.
    Last edited: Feb 22, 2012
    #2
  4. PhilW
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    PhilW Member

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    [Feb 23, 2012]
    Does it crank over quickly too many times before starting or is the cranking slower?

    Mine cranks quickly then just about starts.
    #3
  5. stu_m
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    stu_m Well-Known Member VCDS Map User

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    [Feb 23, 2012]
    Before replacing the glow plugs just try this

    Put the side lights on before trying to start

    There is a common problem with the headlight switch that causes the car to turn over a few times before it will start
    #4
  6. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Feb 23, 2012]
    The glowplugs won't affect the cracking speed, thats more battery dependant.
    #5

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