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poor starting

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by hubbo1, Sep 25, 2012.

  1. hubbo1
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    hubbo1 Member

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    [Sep 25, 2012]
    when the car is first started in the mornings it struggles a bit, i have put new glow plugs in and new fuel filter but still the same.
    it only does this on the first start when cold,any other time it is fine. it is a 2.0 tdi.
    any help would be appreciated
    thanks
    #1
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  3. mm707
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    mm707 Member

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    [Sep 25, 2012]
    Have you had new injectors / loom fitted ?

    Mine has been the same since having those
    #2
  4. hubbo1
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    hubbo1 Member

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    [Sep 25, 2012]
    no, no new injectors or loom, its 2005 model.
    #3
  5. i_786_i
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    i_786_i Member

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    [Sep 25, 2012]
    Mine had a poor start when using cheap diesel... flushed out the old stuff with quality fuel and treatment, been better ever since :)

    Also you should press the clutch when starting for a better start (if yours is a manual).
    #4
  6. karbonk
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    karbonk Living a little!

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    [Oct 12, 2012]


    Worth testing your battery.
    I suffered poor starting a little while back thought it may be Glow plugs. Put my CTEK battery conditioner on my battery to feed it some life but it came up (!) showing it was DEAD!

    I purchased a new Bosch S4 battery for my A3 2.0 TDI and now it kicks over first time without any hesitation. Glow plugs got sent back.
    Last edited: Oct 12, 2012
    #5
  7. rizzini7
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    rizzini7 Active Member

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    [Oct 12, 2012]
    Unrelated I know, but I have to press the clutch to start mine anyway??? Does everyone else??? Also mines a little slower starting now its turning cold. Hope you get it sorted mate
    #6
  8. VagPro
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    VagPro Active Member

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    [Oct 12, 2012]
    Whats the mileage, could be the coolant temp sensor as this tells the ECU what the temperature is and determines how long the glow plugs should stay on for...
    #7
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  9. hubbo1
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    hubbo1 Member

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    [Oct 24, 2012]
    i have changed the fuel temp sensor, made no difference, so should i now change the coolant temp sensor?
    #8
  10. twist123
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    twist123 Member

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    [Oct 24, 2012]
    Just heat the glowplugs twice. Key in, glowplug light out, turn off, key in, glowplug light off, start.
    #9
  11. twist123
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    twist123 Member

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    [Oct 24, 2012]
    ... sounds like battery though.
    #10
  12. VagPro
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    VagPro Active Member

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    [Oct 24, 2012]
    Hubbo,

    See page 34 in document below, the Engine Coolant Temp Sensor and Glow Plug relay dictate the glow plug duration. The fuel temp sensor does not seem to have anything to do with the glow plug system....

    SSP_316 The 2.0 ltr TDI engine
    #11
  13. hubbo1
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    hubbo1 Member

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    [Oct 24, 2012]
    thanks for that! new coolant temp sensor orderd!
    #12
  14. twist123
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    twist123 Member

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    [Oct 24, 2012]
    Id be surprised if it were the coolant temp sensor as the temp reading doesnt get to operating temp (90) when its knackered and/or the heater doesnt get hot.
    #13
  15. VagPro
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    VagPro Active Member

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    [Oct 24, 2012]
    Hubbo, not saying that IS the fault but it does have an input to the glow plug glow duration.... it could also be a bad battery and I have come across the 2.0TDI's with a weak starter motor, leading to not enough RPM's to commence fuelling (However this problem occurs when the engine is warm)
    #14
  16. hubbo1
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    hubbo1 Member

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    [Oct 24, 2012]
    yep i understand, no issues when car is warm, battery all good, its only the first start in the morning-will let you know when i have changed the sensor.
    #15
  17. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Oct 24, 2012]
    id say batt aswell.
    #16
  18. hubbo1
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    hubbo1 Member

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    [Oct 26, 2012]
    ok, tested battery this morning-12.24 volts, with engine running was 14.56 volts, is 12.24 volts good or bad?
    #17
  19. twist123
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    twist123 Member

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    [Oct 26, 2012]
    Sounds fine, battery may not be great in the CCA dept. thats why it turns over slow when its cold and fine when warmer. Can try cleaning terminals. Tdi engines pull more from a battery than petrols so need bigger batts. CCA = Cold Cranking Amps.

    How old is the battery, has it done this since ownership? Check type and CCA.
    #18

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