Cylinder 1 misfire spark plug black on one side

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by ozmatt, Feb 14, 2021.

  1. ozmatt

    ozmatt Active Member

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    This plug came out of a 2008 that I got last week with cylinder 1 misfire, 496,600km

    I swapped out the plug with a known good plug, no change

    Swapped coil #1 for #2 still no change

    Haven't done a compression test yet, looks like it might be blown head gasket (my first guess) control ring, or bad fuel injector!

    Dare to guess what it will be ?

    Image%20(2).jpeg Image%20(3).jpeg Image%20(4).jpeg

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  2. SFO

    SFO Senior Member

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    My WAG would be the injector. How many misses per 1k rpm?
     
  3. ozmatt

    ozmatt Active Member

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    Sfo I really hope you are right! The car is not worthy of an engine swap or head gasket and I do not need any more parts cars

    Can't remember which way around it was but for the two columns on the monitor tool for misfires, one count was like 75 the other a lot less like 5 or 10 and run time just a minute or so.

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  4. ozmatt

    ozmatt Active Member

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    Went back to the car today now the misfire has gone from only cyl1.. to 1,2 and even a couple on 3&4

    Has anyone seen misfire rate pattern like this before and if so, what was it?

    There is only water in the radiator, and has a new water pump, I guess most likely will be head gasket :/ Image%20(8).jpeg

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  5. SFO

    SFO Senior Member

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    How do the short/long fuel trims look in techstream?
     
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  6. ozmatt

    ozmatt Active Member

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    Thanks for reply SFO .. I will check and post result soon as i get a chance
     
  7. mr_guy_mann

    mr_guy_mann Senior Member

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    Test for compression, test for actual spark output from each coil (use a spark tester), test to see if the fuel injector can deliver fuel to the cylinder. If nothing shows up then scrap it and move on.

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  8. ozmatt

    ozmatt Active Member

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    Thanks Guy_Mann

    Its only a parts car with potential to be saved if the engines not ruined, one day soon i will check everything above and report back :) Cheers
     
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