Unplug EGR Valve

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Paladain55, Oct 20, 2021.

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  1. rjparker

    rjparker Tu Humilde Sirviente

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    If you are losing coolant it is at an advanced stage. Sealant might work for three months if you are very lucky.

    The insidious thing about sealant is it seems like a miracle at first and people get false confidence. A couple of months later they repeat because the rattle returns. Pretty soon it's junk the engine or car. The car because the radiator and heater core are messed up.

    Bottom line, really save for another car in three months regardless of how great the sealer seems.
     
    #61 rjparker, Apr 25, 2025 at 4:53 PM
    jerryedwards likes this.
  2. jerryedwards

    jerryedwards New Member

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    but this was a trail of fluid for a long stretch of gravel road. it was dark enough and wide enough that I thought my coolant was empty but when I looked it was fine. even checked the oil and its fine.
     
    #62 jerryedwards, Apr 26, 2025 at 1:13 AM
  3. ASRDogman

    ASRDogman Senior Member

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    What color is it? If it's dark, dark what? Brown? like engine oil? Red, like from the transmission?
    The coolants don't get a dark color.

     
    #63 ASRDogman, Apr 26, 2025 at 7:09 AM
  4. MAX2

    MAX2 Senior Member

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    Coolant leakage can occur due to damaged hoses or too high engine temperature, when it will be released through the relief valve on the radiator. What was the engine temperature at the time?
    Do you use any diagnostic tools?
     
    #64 MAX2, Apr 28, 2025 at 2:16 AM
  5. Paladain55

    Paladain55 Active Member

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    bad headgasket cars knock super hard on start up until they clear out the fluid. Clogged egr passages cars knock ever so slightly at mid throttle which usually doesn't trigger a p0401. If the rough running is still there after the unplugging the electrical connector, its time to schedule a leak down test.

    Also, the intake manifold clogs first. Then the cooler clogs. Valve clogs last. p0401 usually doesn't throw for most people soon enough hence all of the cars with bad head gaskets from misfiring.
     
    #65 Paladain55, May 1, 2025 at 9:51 AM
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