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Misfiring

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by PriusNewbie32, Jul 27, 2019.

  1. PriusNewbie32

    PriusNewbie32 Junior Member

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    Prius has been misfiring. EGR pipe cleaned, spark plugs changed, ignition coil changed. My mechanic thinks it's contaminated gas. He suggests running it out. As it misfires once I hit 15, and not while idling, I thought about just turning on maintenance mode and idling the tank out. How long can I safely leave maintenance mode on? Any idea how long it'll take to idle out half a tank?

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    #1 PriusNewbie32, Jul 27, 2019
  2. bisco

    bisco cookie crumbler

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    did you do the whole egr circuit? throttle body? how many miles on her?

    i hope its not the headgasket
     
    #2 bisco, Jul 27, 2019
    Last edited: Jul 27, 2019
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  3. Groundpounder17

    Groundpounder17 Member

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    The all too common high mileage gen 3 misfire. I hope your mechanic is right but out of all the misfires I’ve read about I have yet to read about one due to contaminated gas. Did you clean the complete egr system and did this happen before or after the misfiring began?
     
    #3 Groundpounder17, Jul 27, 2019
  4. PriusNewbie32

    PriusNewbie32 Junior Member

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    I cleaned the pipe and only cleaned the EGR valve as far as I could get the cleaning straw in. I didn't take it off. It started after we cleaned it as soon as we put it back together.

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    #4 PriusNewbie32, Jul 27, 2019
  5. PriusNewbie32

    PriusNewbie32 Junior Member

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    #5 PriusNewbie32, Jul 27, 2019
  6. Groundpounder17

    Groundpounder17 Member

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    The egr cooler needs cleaning
     
    #6 Groundpounder17, Jul 27, 2019
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  7. bisco

    bisco cookie crumbler

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    #7 bisco, Jul 27, 2019
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  8. PriusNewbie32

    PriusNewbie32 Junior Member

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    Can I siphon gas out? I don't want to jump start the fuel pump.

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    #8 PriusNewbie32, Jul 27, 2019
  9. bisco

    bisco cookie crumbler

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    i don't see why not
     
    #9 bisco, Jul 27, 2019
  10. PriusNewbie32

    PriusNewbie32 Junior Member

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    #10 PriusNewbie32, Jul 27, 2019
  11. Mendel Leisk

    Mendel Leisk Senior Member

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    You need to clean EVERYTHING between the EGR connection to the exhaust, through to the intake ports, and install an oil catch can.

    It's a design fail.

    Per @bisco : how many miles?

    Watch all the relevant @NutzAboutBolts videos, pinned at top of 3rd gen maintenance forum.

    Do that first, leave the gas siphoning for later.
     
    #11 Mendel Leisk, Jul 27, 2019
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