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P0304 cyl#4 misfire

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by tomw, Dec 17, 2013.

  1. tomw

    tomw Junior Member

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    Milton, ON, Canada
    Vehicle:
    2007 Prius
    Model:
    II
    P0304 code occasionally kept coming up in the last few weeks. After ruling out coils (I swapped them around) and spark plugs I took the fuel injectors off and sure enough cyl#4 injector wasn't spraying nearly as good as the rest. Run some carb cleaner through it and it was as good as new.
    While putting everything back together I must have not lined them up perfectly because I had a leak when I started it back up. I took everything apart and tried it again. This time no visible leak but it the smell keeps coming through the vent while driving. I've ordered new o-rings for the injector since there's gotta be a leak which I can't see but I can smell.
    The way I reinstalled them was I pushed the injectors into the fuel rail and then pushed everything in together. Any other suggestions?
     
    #1 tomw, Dec 17, 2013
  2. Zedhomme

    Zedhomme Member

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    Three
    Here's a page from the repair manual. Just need to make sure the injector goes in straight and put some gasoline or spindle oil on the O-ring, so it doesn't distort going in. If they've been in and out a couple times, hope the new O-rings come soon.
     

    Attached Files:

    #2 Zedhomme, Dec 17, 2013
  3. tomw

    tomw Junior Member

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    2007 Prius
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    II
    Thanks. I'm picking them up tomorrow.
     
    #3 tomw, Dec 17, 2013
  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    I hope that you will be replacing the O-rings for all four injectors.
     
    #4 Patrick Wong, Dec 17, 2013
  5. tomw

    tomw Junior Member

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    2007 Prius
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    II
    Yes, all 4 are getting replaced
     
    #5 tomw, Dec 18, 2013
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