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2010 toyota prius cylinder number 4 indentification

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by tjohnson329, Feb 17, 2023.

  1. tjohnson329

    tjohnson329 New Member

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    I have a 2010 toyota prius with a P0304 cylinder 4 missfire. I have read the thread and looking to troubleshoot but I dont know which one is cylinder 4. any help would be appreciated.
     
    #1 tjohnson329, Feb 17, 2023
  2. Tombukt2

    Tombukt2 Senior Member

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    Stand on the right side of the car with the hood up You're looking straight down at the front of your engine at this point The number one spark plug is the closest to your body number two three and four are right behind so the number for spark plug when you're sitting in the car would be the one closest to your probably right knee so if you're standing in the front of the car It would be the last spark plug on the left closest to the driver the one on the far right closest to the passenger is number one
     
    #2 Tombukt2, Feb 17, 2023
  3. mjoo

    mjoo Senior Member

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    Cylinder #1 is closest to the front of the engine. The front of the engine has the harmonic balancer and accessories (water pump, etc). The rear of the engine is connected to the transmission.

    Cylinders are numbered in ascending order starting from the front to the rear.
     
    #3 mjoo, Feb 17, 2023
  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Touring
    What's the miles on it? Has the EGR system ever been cleaned?

    Cylinder numbering:

    upload_2023-2-17_9-8-5.png
     
    #4 Mendel Leisk, Feb 17, 2023
  5. bisco

    bisco cookie crumbler

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    Same poster with the bad egr
     
    #5 bisco, Feb 17, 2023
    Mendel Leisk likes this.
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    Touring
    Ah, the ol' double thread trick.
     
    #6 Mendel Leisk, Feb 17, 2023
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