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Thread: Can one rev a Diesel Vectra engine from under bonnet?

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    Default Can one rev a Diesel Vectra engine from under bonnet?

    All,

    I remember the days when throttles (well on petrols) used to have a throttle cable and you could move the throttle assembly by hand whilst you had your head under the raised bonnet thus causing the engine to rev. I have a CDTi, my question is, can you do this from this car or is it totally electronic and need someone to press the throttle pedel from within?

    thanks

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    I think you need to have someone press the accelerator pedal for you.

    Throttle cables are a thing of the past and I believe (Someone please correct me if I'm wrong) that the throttle sequence is now all electronic.

    HTH

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

    Default

    You can't rev a deisel under the bonnet as they are drive by wire, what's more the throttle flap doesn't govern the acceleration in a diesel, pressing the throttle pedal tells the ECU to allow more fuel into the cylinders. It has nothing to do with the throttle plate/body.

    Gazza4

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    Regular Member Tonyl55's Avatar
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    Is this a bad thing or good thing? Can't understand how it would work without a Throttle cable?

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

    Default

    Quote Originally Posted by Tonyl55 View Post
    Is this a bad thing or good thing? Can't understand how it would work without a Throttle cable?
    Deisels can work on a variety of Air/Fuel mixtures (2:1 - 50:1) and therefore a throttle isn't needed. The only thing the plate does in a deisel engine is control emissions.

    Gazza4

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    Regular Member marktaylor's Avatar
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    Quote Originally Posted by Tonyl55 View Post
    Is this a bad thing or good thing? Can't understand how it would work without a Throttle cable?
    its done by a sensor on the acelerator pedal , and a signal is sent to the ecu and this then sends a signal to the engine to allow more fuel

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    http://www.wisegeek.com/what-is-a-potentiometer.htm

    This is a Potentiometer basiclly a switch like a rotary switch or a sliding one that alter the resistence.

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    They are 'drive by wire'. no cable on petrol engines either (2.2),
    electronic signal is sent to the ecu on ' how much ' power is required.

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