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  1. #1
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    Dodgy Starting Mk2

    Mk2 Digifant Aussie Car

    Goes OK, but usually when hot it starts by coughing and spluttering and then runs ok.

    Smells of fuel and doesnt run as well as it should. uses heaps of petrol too.
    Cold start is not too bad.

    Changed the fuel pump relay. Can someone with a digi Mk2 look at the vacuum lines from the throttlebody and tell me where they should go, this one has two hoses, one from each outlet, joined by a T and going to the FPR. Is this right?
    Camden GTI Performance. VW / AUDI Specialists
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  2. #2
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    Bad water temp sensor MAtt.

    Unless it runs better when stone cold then it might be the lambda probe

  3. #3
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    if u show me a pic mate i can check mine

  4. #4
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    How many water temp sensor matter Gav?

    I changed the blu two pin one on the top of the water outlet, there is another underneath, which I thought was for the gauge only.

    It does actually run better stone cold.

    I was thinking Lambda probe, will hook it up to the VAG com and check tomorrow.
    Camden GTI Performance. VW / AUDI Specialists
    All Mechanical Work, Log book Servicing, New and used Parts and Imports
    19-20/6 Badgally Road, Campbelltown, 2560
    02 4627 3072 or 0423 051737 www.camdengti.com

  5. #5
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    Quote Originally Posted by Golf Loon View Post
    How many water temp sensor matter Gav?

    I changed the blu two pin one on the top of the water outlet, there is another underneath, which I thought was for the gauge only.

    It does actually run better stone cold.

    I was thinking Lambda probe, will hook it up to the VAG com and check tomorrow.
    Yeah the blue one for the ECU.

    The good cold running points to the probe or wiring mate.

    Not sure that the VAG-COm can do much for you. You can check the output of the probe with a voltmeter. Monitor the purple wire with respect to earth and you should see the voltage rise from 0 to 1 volt as the engine warms up. Once up to temp the meter will not be able to keep track of the voltage because it will constantly be changing. As it and the ECU alter the mixture. If you floor the throttle it'll go to a full rich state and then when you back off it'll drop to zero until the idle cuts in. This is because of the over-run cut off.

    If it doesn't work as described above you need to check that the heater wires are ok as well as the earth and signal to the ECU.

    I reckon it runs lumpy once warm because it has nothing to gauge the fuelling on so runs rich to avoid engine damage.

    Gavin

  6. #6
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    isv? not sure tho

  7. #7
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    That sounds exactly like it Gavin, I can read the lambda output with my 1551 machine, but the symptons you describe are right on the money.

    I`ll try it tomorrow and let you know how I go.
    Camden GTI Performance. VW / AUDI Specialists
    All Mechanical Work, Log book Servicing, New and used Parts and Imports
    19-20/6 Badgally Road, Campbelltown, 2560
    02 4627 3072 or 0423 051737 www.camdengti.com

  8. #8
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    Quote Originally Posted by Golf Loon View Post
    I can read the lambda output with my 1551 machine,
    Or not as the case may be ;0)

  9. #9
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    cold start injector running more than it should? do digi run a thermo time switch on the 5th inj?
    Cheers, Benny
    www.axesent.com.au

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