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Thread: Z30DT Throttle body

  1. #1
    Regular Member ScottyV6's Avatar
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    Default Z30DT Throttle body

    As I didn't mean to hijack another thread with my query, I thought I would start a new one.
    when I looked at my throttle body when cleaning the pipes, so to speak! I noticed that it was wide open when the engine wasn't running.
    This can't be right, can it? every other car I have owned in the past (albeit petrol) the butterfly flap on the throttle body is always closed when engine not running. apart from a small gap. but not on my Vectra, Wide open!

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    Same here.

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    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default

    I don't know if the Z30DT flap is electronically controled but on my Y30DT it makes a hiss and the flap closes.

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    Vehicle : Opel Signum

    Trim : Cosmo

    Engine : 3.0 CDTI Z30DT

    Year : 2006

    Default

    Obviously the intake throttle valve in a petrol engine performs a very different role than in a diesel engine. I guess that the fail-safe position of the throttle valve in a diesel engine is to maintain it wide-open, whereas in a petrol engine it is slightly open to allow it to idle.

    We regulate a non-direct injection petrol engine by opening and closing the throttle valve, thus allowing more air into the manifold (which will be mixed with fuel at a fixed air to fuel mass proportion: 14.7 tons of air per every ton of petrol). So we control the quantity of air-fuel mix by means of the throttle valve (it cannot be fully closed or no air can enter the engine, it cannot be fully open at idle, so the fail-safe position in case something fails is to maintain it slightly open).

    We control a diesel engine by varying the quantity of fuel (only), so the air intake path doesn't usually need throttling. This valve is used here to either bypass the intercooler and increase the intake air temperature (for a DPF regeneration), or to decrease the amount of fresh intake air entering the engine (by throttling it in a diesel, for a change) with the aim of increasing the EGR rate without recirculating so much exhaust gas into the engine. So if the valve fails, the safest position which allows the engine to work is wide-open throttle.

    (I hope it didn't sound too pedantic)

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    Regular Member ScottyV6's Avatar
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    Thank you yoladeuche! you weren't coming across as pedantic at all, but very informative! thank you very much.

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    Vehicle : Opel Signum

    Trim : Cosmo

    Engine : 3.0 CDTI Z30DT

    Year : 2006

    Default

    Thanks, although it seems my memory has mixed the facts a bit regarding its functions in a diesel. The exact mechanism used for EGR is to create a vacuum in the intake manifold (to increase the flow of exhaust gases), and the thing about DPF regeneration is not performed by "regular" throttle valves like the one in the first link:
    http://delphi.com/manufacturers/auto...ontrols/dmvrv/
    http://delphi.com/manufacturers/auto...ontrols/ddetc/

    What I didn't know is that they are also used to smooth engine shutdown.

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    Vehicle : vectra c

    Trim : speedline 18

    Engine : z30dt

    Year : 07

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    "So if the valve fails, the safest position which allows the engine to work is wide-open throttle."

    so when the engine runs on idle the flap must be wide open?
    I try to close it using a Tech2 and the engine sound is much better but after a few sec the flap open again
    what is the correct position ?

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