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Thread: What Is This For

  1. 10th November 2014, 11:37 PM #1
    d2dave's Avatar
    d2dave
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    What Is This For

    On my 03 Td5 Disco I have removed my EGR. There was a vacuum line which ran back to a block(I would describe this as a vacuum manifold) between the coolant overflow bottle and the brake booster. This was disconnected and blanked off.

    I was under the bonnet today and having a look at this vacuum manifold. What purpose does this thing now serve.

    There is a vacuum supply to it from a tee off the line to the brake booster.

    This manifold has two switches in it and has two vacuum lines coming out of it.

    These two lines then join in a larger line which runs around the top of the radiator and into the top of the air filter box.

    Now that I no longer have egr, does any of this above mentioned stuff have a purpose or is it more useless crap that I can now get rid of?
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County
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  2. 11th November 2014, 12:04 AM #2
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    sierrafery
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    It's the EGR modulator... completely useless now, u can get rid of it just clog the vacuum supply make sure the plug doesnt get short to earth cos it will blow fuse F2 which is feed for MAF and wastegate modulator too
    Discovery Td5 (2000), manual, tuned
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  3. 11th November 2014, 12:08 AM #3
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    d2dave
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    So ecu won't notice the plugs disconnected from the solenoids and log a fault?
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County
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  4. 11th November 2014, 12:38 AM #4
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    It will log the "EGR stuck closed" code with the modulator unplugged or with it in place as long as the valve is bypassed
    Discovery Td5 (2000), manual, tuned
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  5. 11th November 2014, 10:34 PM #5
    kelvo
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    Quote Originally Posted by sierrafery View Post
    It will log the "EGR stuck closed" code with the modulator unplugged or with it in place as long as the valve is bypassed
    I've had both mine unplugged now (EGR removed) for just over 12 months, and have never had any EGR errors logged. This is using Nanocom for error checking.

    Not sure if it makes any difference between engine models, but mine is the 15P so twin modulators.
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  6. 11th November 2014, 10:55 PM #6
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    that's strange... and IMO not normal, is yours remapped?
    Discovery Td5 (2000), manual, tuned
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  7. 11th November 2014, 11:35 PM #7
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    Useless crap, get rid of it
    I found a .22 shell in a small piece of vac tube was a perfect plug on the airbox lid...
    If you get a remap at some point, you can specify a base map from places like South Africa which never had EGRs so you'll stop getting the EGR fault.
    The Phantom - Oslo Blue 2001 Td5 SE.
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  8. 12th November 2014, 12:12 AM #8
    Tombie Guest
    Quote Originally Posted by sierrafery View Post
    that's strange... and IMO not normal, is yours remapped?

    Quite normal.

    No limit sensors on EGR so ECU just modulates and expects it to work.

    It can not tell if anything did or didn't...
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  9. 12th November 2014, 12:20 AM #9
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    Tombie. We are talking about the electronic solenoids, not the EGR intself.

    So if they are removed this leaves two plugs that would be open circuit.

    So the ECU would be able to tell. Whether or not it does is what we are discussing.
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County
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  10. 12th November 2014, 12:25 AM #10
    Tombie Guest
    No it shouldn't... Because it doesn't look

    It just sends a signal - it doesn't look at the result.
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