"EGR DELETE" Instructions

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Paladain55, Jun 17, 2023.

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  1. rjparker

    rjparker Tu Humilde Sirviente

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    An increasingly common egr valve problem is a valve that sticks open when it should be closed. This can causes stumbling and stalls.

    Blocking the egr is diagnostic of a sticking valve and is better than only disconnecting the connector.
     
    #121 rjparker, May 18, 2026 at 8:36 PM
    Last edited: May 18, 2026 at 9:01 PM
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  2. CR94

    CR94 Senior Member

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    My understanding is that if the connector is unplugged, engine management programming recognizes that and adjusts timing or other variables to minimize risk of knock that EGR normally supresses.
     
    #122 CR94, May 18, 2026 at 8:52 PM
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  3. Paladain55

    Paladain55 Active Member

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    The fact this guy bring this same point up for probably half a decade now is wild after all the positive experience we've had with the egr delete and egr cleaning. Master gaslighter. Even has a low mileage gen 3 prius so no experience with these issues. Clearly the cars are blowing head gaskets on cylinders 1 and 2 every time, and those are the egr circuits which clog first. Having an unbalanced intake charge is no bueno. Leads to misfires very quickly on these engines. And the car can't correct as its clear the knock sensors don't pick it up and neither does the upstream oxygen sensor.

    One other wild stat is i remember the winter cold starts where the car would suck up water vapor from the pcv and knock on cold winter mornings for a couple seconds before it cleared out every blue moon. It never once threw a check engine light for a knock/misfire. lol

    Keep doing the EGR unplug boys, just make it ready to go in case of emissions.
     
    #123 Paladain55, May 19, 2026 at 2:36 PM
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