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Golf V 1.9 TDI 105km - Golf V 1.9 TDI smokes heavily on a warm engine

sylweczka2006 26178 16
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 17124489
    sylweczka2006
    Level 7  
    Hello, I have a problem with golf 5, the car when it is cold smokes from an arrow as soon as it starts to spin, no lights are on, the computer also shows nothing, the mechanic said that you need to upload a new fuel map, had someone similar problem? Thanks in advance for your help.
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  • #2 17124497
    Ireneo
    Level 42  
    See how warm it fires when you disconnect the coolant temperature sensor
  • #3 17125056
    sylweczka2006
    Level 7  
    I disconnected the sensor and still it is
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  • #4 17125122
    wojtego
    Level 13  
    The crankshaft position sensor may lose its properties after heating and hence firing problems. He won't show an error then.
  • #5 17125571
    seba694637
    Level 16  
    Before the mechanics talk you into unnecessary services, check the battery's starting current. Let him stand overnight and then have him checked. A warm diesel needs more electricity to start. Often the first signs of diesel battery wear are heavy firing when the engine is warm
  • #6 17126778
    sylweczka2006
    Level 7  
    I noticed that there is a gel battery here, is there a difference? and how to check it?

    Added after 3 [hours] 41 [minutes]:

    and besides, it's not the other way around? he should smoke badly on a cold engine if it was a battery, and a cold one smokes an arrow. It doesn't matter if it's -15 or -20
  • #7 17130780
    seba694637
    Level 16  
    At -20 degrees a functional lead-acid battery will have about 50% of its capacity - and therefore a smaller starting current.

    At +20 a fully functional and charged battery will start your car without a problem, but when the engine is warmed up, the demand for starting current is greater. So when the battery does not demand it will run harder on a warm engine
  • #8 17131907
    sylweczka2006
    Level 7  
    Will you tell me how can I check it? because usually when I had a problem with the battery it would sit down already
  • #9 17132475
    piotrek1994
    Level 14  
    The subject of heavy start-up of a hot tdi is well-worn and here the most help with increasing the starting doses programmatically (uploading a new fuel map) Approach someone who performs such services in your area show him how he smokes warm and someone who knows the topic will tell you immediately whether increasing the doses will do the trick. Greetings
  • #10 17132481
    bodzio012
    Level 33  
    piotrek1994 wrote:
    The subject of heavy start-up of a hot tdi is well-worn and here the most help with increasing the starting doses programmatically (uploading a new fuel map) Approach someone who performs such services in your area show him how he smokes warm and someone who knows the topic will tell you immediately whether increasing the doses will do the trick. Greetings


    After all, he wrote that he disconnected the temperature sensor, so your advice will do nothing, unless it did not disconnect the sensor.
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  • #11 17132799
    seba694637
    Level 16  
    At a first-class workshop, you can perform a battery inrush current check. It should be similar to the one on the battery case
  • #12 17151666
    sylweczka2006
    Level 7  
    I also noticed that sometimes it is warm as if the starter is locked
  • #13 17180543
    mihai
    Level 2  
    I suggest to drive to the Tuner to increase the engine start dose. It helped me
  • #14 17181108
    bodzio012
    Level 33  
    mihai wrote:
    I suggest to drive to the Tuner to increase the engine start dose. It helped me

    Next what she reads ...
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  • #15 19209337
    Tom2204
    Level 1  
    I had such a vw bora, first on a warm long shot and in the last months and on a cold one, as if the battery was at the outlet. One-year battery, and what a mechanic is a different diagnosis, and I have had a few years. Already had to be uploaded map, etc. and the reason was very simple, one brush was a curve in the starter. After replacing them, whether in cold or hot, smokes to the touch. 1.9 tdi agr 90 km
  • #16 19209372
    k124l
    Level 20  
    Before you hit the costs, regenerate or replace the starter and improve the current connections on the battery starter. Warm tdi needs around 250 rpm to ignite.
  • #17 21301530
    Gwizdinho90
    Level 2  
    >>17124497 .
    When I disconnect it smokes on shot.
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Topic summary

A Volkswagen Golf V 1.9 TDI 105 km exhibits heavy smoke emission immediately upon startup when the engine is warm, without triggering any error codes or warning lights. Disconnecting the coolant temperature sensor does not resolve the issue. Potential causes discussed include a failing crankshaft position sensor that loses functionality when heated, and insufficient battery starting current, especially relevant for diesel engines requiring higher current at warm start. The presence of a gel battery raises questions about testing methods, with suggestions to measure battery inrush current at a qualified workshop. Another frequent recommendation is to increase the starting fuel dose by uploading a revised fuel map via engine tuning services, which has reportedly helped similar cases. Additionally, mechanical issues such as a worn starter motor—specifically damaged brushes causing starter locking and poor current delivery—can mimic these symptoms and should be inspected and possibly replaced before incurring tuning costs. Improving battery-to-starter electrical connections is also advised to ensure adequate cranking speed (around 250 rpm) for warm ignition in TDI engines. The problem is consistent across temperature ranges, including extreme cold (-15 to -20°C), and is not solely related to battery charge state.
Summary generated by the language model.
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