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CAR HAS LOST POWER - Golf Volkswagen Cars & Trucks

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  • pammyreet1 May 16, 2010

    NO MISFIRING ALL CYLENDERS WORKING OK

  • pammyreet1 May 17, 2010

    AIR MARSER WE HAVE CHANGED WITH NEW ONE. DEISEL PUMP HAS INBUILT PRESSURE SYSTEM . WE HAVE TRIED WITH OTHER GOOD DEISEL PUMP ALSO.

  • pammyreet1 May 17, 2010

    thanks for such a nice experience of your .but we have checked all fuel line and we have changed deisel pump too . silencer also was checked . still car has no pickup in second and third gear and wont go more than 150 km speed. it takes lot of time. no power . mine is skoda octavia 1.9 tdi. it goes easily 190 before.

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I would think if itsa diesel its your DPF filter sensors that is the problem. Is your "coil" light on?


Posted on Jun 18, 2010

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Is it running rough like one cylinder is misfiring from a bad spark plug or injector, or is it all cylinders like from a bad air mass sensor or temp sensor?

Posted on May 16, 2010

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  • Kirk Augustin
    Kirk Augustin May 17, 2010

    Then it is probably a sensor that is effecting all cylinders equally.
    The air mass sensor is one of the first ones to try.
    It works by measuring the heat loss, so if it gets coated with oil and water vapor, it won't work right. It will be like holding the throttle from opening.

    But there are temperature sensors, fuel pressure regulator, etc. also.


  • Kirk Augustin
    Kirk Augustin May 17, 2010

    Diesels used to be very different than gasoline engines.

    They always used to have a mechanical pump that could inject directly into the combustion chamber.

    The main problems then were water and clogged injectors.

    But I believe modern diesels have electronic fuel injection systems as well these days. But I am not too familiar.

    The first thing that comes to mind is the fuel filter, because diesel fuel always has a lot of water and wax build up.

    I have also seen a few were the exhaust had gotten patially plugged by carbon.

  • Kirk Augustin
    Kirk Augustin May 17, 2010

    Sorry I can't be more helpful, but I have no TDI experience.

    (Turbo Direct Injection)

    I hope there will be some people here with VW TDI experience, since the US laws make that about the only diesel popular in the US.

    The last remaining guesses I can think of would include things like a stuck wastegate that could be letting the turbo boost escape, or a bad temperature sensor for the electronic injection. I don't know what the ohms of the temp sensor should be, but when they go bad, they usually go to 0 or infinite resistance.



    You may also want to do a compression check. Deisels are known for head cracks since the high pressures. But remember not to use a gasoline engine compression tester. I did that once before I realized the pressure are so much higher. But I don't even know if you can, because I am used to using the glowplug opening. I don't know if you even have a port on an Octavia.

    Compression also makes me think of the valves. I don't know if there could be an adjustment problem.



    And there would also have to be a timing means for the injection.

    If it is belt driven, perhaps it jumped a tooth?

    Did the loss of power happen suddenly, or slowly?

  • pammyreet1 May 17, 2010

    thanks once again. may be you are right. today they opened engine head and found valves were leaking. this happened slowly.

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