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VW EGR Valve Disconnection

  • 21-02-2009 12:10pm
    #1
    damo150
    Closed Accounts Posts: 13 ✭


    I was talking to a mechanic the other day and he told me to disconnect the EGR valve in my car which is a tdi 150 bora. He works on alot of Jeeps and he said he disconnects them on all even new ones. It stops the build up of soot and sludge in the inlet manifold, making the engine cleaner.
    I disconnected the vacuum pipe and blocked it up. When driving it there was less turbo lag and you get a nice blow sound from the exhaust when backing off the rev's and ran perfect.
    Is disconnecting this a good or bad idea and if good should i block it up completely by blocking the pipe from the exhaust aswel?


Comments

  • #2
    craichoe
    Closed Accounts Posts: 2,706 ✭✭✭craichoe


    damo150 wrote: »
    I was talking to a mechanic the other day and he told me to disconnect the EGR valve in my car which is a tdi 150 bora. He works on alot of Jeeps and he said he disconnects them on all even new ones. It stops the build up of soot and sludge in the inlet manifold, making the engine cleaner.
    I disconnected the vacuum pipe and blocked it up. When driving it there was less turbo lag and you get a nice blow sound from the exhaust when backing off the rev's and ran perfect.
    Is disconnecting this a good or bad idea and if good should i block it up completely by blocking the pipe from the exhaust aswel?

    You'll fail and emissions test on the NCT For NOX gasses, also theres a chance you could damage the cat with a chance unburnt fuel could combust in it.


  • #3
    10-10-20
    Registered Users, Registered Users 2 Posts: 8,073 ✭✭✭10-10-20


    It's possibly linked to crank-case ventilation, so it's possibly not such a good plan.
    Any piston blow-by will cause a build-up of pressure in the sump area, forcing oil out past the seals and what-not.
    Also, EGR serves to re-burn the any partially combusted gasses which linger in the manifold following deceleration, so the engine belches more unburned hydrocarbons.


  • #4
    gofaster_s13
    Registered Users, Registered Users 2 Posts: 942 ✭✭✭gofaster_s13


    craichoe wrote: »
    You'll fail and emissions test on the NCT For NOX gasses, also theres a chance you could damage the cat with a chance unburnt fuel could combust in it.

    Nox gases are not measured on a diesel, only smoke opacity. The EGR system as well as lowering emissions also reduces EGT's on diesel engines and the disconnection of the system has been blamed for cracked cylinder heads on VW's and BMW's in particular.


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