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Thread: Question about unplugging egr valve

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    Vehicle : Vectra

    Trim : Sri

    Engine : CDTi 150

    Year : 2004

    Mileage : 116k

    Default Question about unplugging egr valve

    Hi again lads. CDTi 150

    is there any bad implications caused by running your car with the egr unplugged as opposed to blanking it?

    I use an enclosed cone filter on my car just tone and when the egr was plugged in I used to get a nice chatter/ whoosh noise when backing off the throttle ( I know it's not terribly good for it ). But since unplugging it this noise has stopped, any reason why that might be?


    also a couple months back I unplugged the egr for a couple days then plugged it back in. A couple days later the copper pipe that comes off the manifold burst, costing a pretty penny. Was this caused by unplugging my egr?

    Thanks

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

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    Default

    Yes everytime it goes for an MOT you need to plug the valve back in as the light will fail the MOT. Also there is a chance the valve is not fully sealing so may be letting gases through to the inlet manifold. The only real way is blanking and having the valve mapped out.

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    Vehicle : Vectra

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    Default

    Anyone?

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    I'm not sure what the copper pipe is or does, but no, unplugging the EGR would not cause any pipes to burst in my opinion. The EGR allows exhaust gas to be recirculated back through the inlet manifold in an attempt to give unburnt fuel a second chance to burn rather than going straight out of the exhaust. The EGR is however closed at some running conditions even when plugged in and so long as the exhaust system (pre-cat, DPF if you have one etc.) itself isn't restricted in some way the exhaust gas should just find it's way straight out of the exhaust pipe when the EGR is closed.

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    Vehicle : Vectra

    Trim : Sri

    Engine : CDTi 150

    Year : 2004

    Mileage : 116k

    Default

    The copper pipe is the one that goes around the engine from the exhaust manifold to the back of the egr valve. No I don't have a dpf so I should be okay!

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    Ok, so it's the connection from the exhaust to the EGR. These shouldn't burst! There is even a GM part number for a Fiat "blanking plate" which if fitted is the equivalent of (or similar to) unplugging the EGR, only you don't get the eml due to the electrical connection error - the hole in the plate is only large enough to let through some exhaust gas, similar to what the EGR lets through when unplugged/closed.

    So, either you had a defective/damaged pipe or you had a large back-pressure in your exhaust system causing the pipe to burst. I'm not sure what else would cause it, but I'm not a mechanic so maybe someone else will come up with a more likely reason.

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