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Thread: Help cleaning EGR valve!

  1. #1
    Regular Member Vectra_Power's Avatar
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    Default Help cleaning EGR valve!

    Hi guys, from reading various posts on the site regarding poor performance under 2000 rpm, slightly lumpy idle and poor economy, it appears my EGR needs checking. Here's the question...

    Does anyone that lives in the York area fancy giving me a hand with this? I'm worried about trying it on my own!

    Cheers

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    hi, its easy,just follow the how 2. if you lived near i would give you a hand ( free ). don,t forget the boost valve how 2

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    Regular Member Vectra_Power's Avatar
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    Cheers mate, I'm going to have a good read and probably give it a go - it does really need it, probably done all it's 119k miles on the original!!

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    Quote Originally Posted by Vectra_Power View Post
    Hi guys, from reading various posts on the site regarding poor performance under 2000 rpm, slightly lumpy idle and poor economy, it appears my EGR needs checking.
    Also check swirl valve operation. EGR valve problems tend to affect the higher rpm performance as well as the lower rpm performance (EGR valve not closing properly, which means that exhaust gas is getting into your engines combustion process when underload and weakening the fuel mixture).

    If your engine is running OK at high revs (no black smoke) I would think that the problem is swirl valves. Swirl valves should close at engine speeds of about just under 2000 rpm. If they do not then they can cause rough running, poor economy, poor driveabilty etc under that engine speed. If the swirl valves remain closed at higher speeds (when they should be open) you will also lose some performance due to them partly restricting the intake manifold. If they are stuck open, performance in the high rpms will not be affected.
    Last edited by diesel dog; 22nd November 2009 at 17:35.

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    If the car smokes alot at lower rpms the swirl valves are stuck open and if there is alot of smoke at higher rpms the swirl valves are stuck shut.

    Gazza4

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    Regular Member Grimo72's Avatar
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    Quote Originally Posted by Vectra_Power View Post
    Cheers mate, I'm going to have a good read and probably give it a go - it does really need it, probably done all it's 119k miles on the original!!

    its really easy mate, just watch you dont drop the gaskets when removing the valve

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    Regular Member signum03's Avatar
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    still want to do my y30dt 3.0 v6 cdti but now how to for this engine!

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    why do you need to drill the valve and how come it works afterwards?

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

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    Quote Originally Posted by sfs View Post
    why do you need to drill the valve and how come it works afterwards?
    THe reason for drilling the hole is to knock the solenoid unit out so that the actuator can be sanded to get rid of the corrosion that stops the egr valve working. The hole also serves as a service hole to enable you to grease the egr valve every so often.

    Gazza4

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    Quote Originally Posted by Gazza4 View Post
    If the car smokes alot at lower rpms the swirl valves are stuck open and if there is alot of smoke at higher rpms the swirl valves are stuck shut.

    Gazza4
    Yes, because at low rpms you will not be getting the necessary flow of air mixing with the fuel with the swirl valves open, and if closed at high rpms, you will not be getting the necessary volume of air to mix with the fuel that is being fed into the combustion chamber.

    The thing to remember is that when the car is accelerating or at high rpms the swirl valves should be open and the EGR valve shut. At lower rpms and when decelerating etc, the swirl valves should be closed and the EGR valve will usually be open.

    You say that your car is performing OK at higher rpms, which suggests to me that the EGR valve is closed (as it should be) and the swirl flaps are open (as they should be). But is not performing well at low rpms, which suggests to me that the swirl flaps are remaining open (when they should be closing to help the air enter the combustion chamber more efficiently). Whether or not the EGR valve opens or closes at low engine speeds and not underload does not really affect the performance of the engine. But if it is closing at high rpms, then there's no reason why it shouldn't be closing at low rpms. An EGR valve that remains closed all the time i.e. 'blanked off', will not affect the performance of the car, but will usually bring up a fault light and possibly put the car into limp mode to say that the EGR system isn't functioning correctly.

    Either a faulty EGR valve or a faulty swirl valve can cause black smoke, depending upon whether they are opened or closed when they shouldn't be.

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