Egr Delete Question

Discussion in 'SN95 4.6L Mustang Tech' started by Cupples981, Jun 5, 2014.


  1. Cupples981

    Cupples981 New Member

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    I'm doing a PI engine swap on my 97 gt. I'm deleting the egr valve. I've already done the penny trick on the header and blocked off the egr on my throttle body plenum. There's a sensor that comes off of the egr tube. What do I do with that? Leave it plugged in and cap it? What about the various vaccuum lines that go to the valve itself?

    Thanks
  2. Mattstang04

    Mattstang04 Active Member

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    Should be able to buy a blanking plate from somewhere pretty cheap. Then it doesn't look so bad and you can remove the thing and get it out from under your hood. Lethal performance might have a blanking plate for it.
  3. trinity_gt

    trinity_gt Advanced Member

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    Curious: Why are you removing the EGR system?
  4. Rusty67

    Rusty67 Well-Known Member

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    Good question. Removing EGR systems on these motors tends to make them run worse, lower HP/TQ and get worse gas mileage. If this is a simple swap to put in a new power plant you should leave it all intact. Are you using the ECU from the 97 ?
  5. trinity_gt

    trinity_gt Advanced Member

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    Yep, though the EGR system is shut off at idle and at WOT so its presence or absence shouldn't reduce maximum output.

    But EGR reduces peak combustion temperatures and thus allows more spark advance at part throttle which increases efficiency. The PCM makes assumptions about EGR flow (which is basically inert gas occupying intake volume) and compensates things like fuel trims. If that flow isn't there and the PCM is not recalibrated those adjustments will constantly be at odds with the closed loop trims.

    I dunno. Seems like kind of a pointless thing to delete.

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