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Spark plug wires

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Stripedshrimp, Dec 19, 2022.

  1. Stripedshrimp

    Stripedshrimp New Member

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    I changed my spark plugs last summer but just realized that I didn't change my wires. Has anyone done this? It seems complicated. It looks like the wires are part of a wire harness. Any pointers would be appreciated. Thanks.
     
    #1 Stripedshrimp, Dec 19, 2022
  2. CR94

    CR94 Senior Member

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    What problem would that solve?
     
    #2 CR94, Dec 19, 2022
  3. Elektroingenieur

    Elektroingenieur Senior Member

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    All Prius cars have a direct ignition system (distributorless ignition), with a separate ignition coil for each cylinder. The spark plug caps are part of the ignition coil assemblies, so there aren’t high-voltage spark plug wires like those in conventional or transistorized ignition systems of older design.
    Indeed, the wires to the ignition coil assemblies are part of the engine wire harness. Unless there’s a problem that can’t be repaired using the methods described in the Electrical Wiring Diagram (more info), there should be no need for replacement.
     
    #3 Elektroingenieur, Dec 19, 2022
  4. Stripedshrimp

    Stripedshrimp New Member

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    No problem really, I am just focusing on preventative maintenance.
     
    #4 Stripedshrimp, Dec 21, 2022
  5. Stripedshrimp

    Stripedshrimp New Member

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    Wow ok thank you!

    This is the info I was looking for.
     
    #5 Stripedshrimp, Dec 21, 2022
    Elektroingenieur likes this.
  6. CR94

    CR94 Senior Member

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    Replacing that wiring harness would be very expensive, a lot of work. and unlikely to prevent any future problem. Best to leave it alone. The biggest threat some people face regarding the engine wiring is rodents chewing on it.
     
    #6 CR94, Dec 21, 2022
    Elektroingenieur likes this.
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