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A4 B7 - 2.0 TDI (PD) - Lumpy idle and white smoke when cold

Benjamin Loveridge-Rowe Jan 4, 2021

  1. Benjamin Loveridge-Rowe

    Benjamin Loveridge-Rowe Registered User

    41
    4
    8
    Hi guys,

    2.0 TDI BRE.

    I’ve got an issue with lumpy idling and white smoke when the engine is cold. The issue goes away once the engine is warm. I’ve looked at the injector correction vales and it’s seems to me cylinder 4 could be a potential issue. The worst value when cold on injector 4 was 1.58mg/H, dropping down to 0.3mg/H when warm (see pics).

    Maximum torsion value is -1.47*KW so I think the timing is fine.

    COLD:

    [​IMG]

    WARM:

    [​IMG]

    TORSION:

    [​IMG]

    EXHAUST WHEN COLD:

    [​IMG]

    What might cause an injector to start at such a high correction quantity, only for it to drop to a normal value when warm?

    Any help or insight would be much appreciated!
     
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  3. bobby singh

    bobby singh BSR Gold Supporter VCDS Map User

    1,009
    790
    113
    Sounds like a leaky injector when left overnight - These 1.9's eat cam's so check that too
    I would replace the injector seals if they haven't been done.

    Cheers
     

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