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Which engine would you pick JDM gen 3 or used or gen 4?

Discussion in 'Gen 3 Prius Technical Discussion' started by daley, Mar 24, 2024.

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  1. rjparker

    rjparker Tu Humilde Sirviente

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    It does actually run the engine longer than 10-15 seconds? Many think the engine is running but it’s just the electric motor spinning it at 1000 rpm.

    Measure the 12v with a meter while in Ready mode. Should be 13-15vdc. It does not need the engine for this, just needs Ready mode. If not there look for that issue.
     
    #21 rjparker, Apr 10, 2024
  2. rjparker

    rjparker Tu Humilde Sirviente

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    I would not use an aftermarket Amazon egr valve if that is what you have. Same goes for maf or map.

    Amazon egr known to stick open
    IMG_4720.jpeg

    Gen3 JDM engine won’t run
    Misfire codes
    @SaneAutoYoutube
    @Georgina Rudkus
    @Tombukt2
    @ChapmanF
    @Mendel Leisk
     
    #22 rjparker, Apr 10, 2024
    Last edited: Apr 10, 2024
  3. daley

    daley Junior Member

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    I am using the EGR that came off my previously working engine, it is an OEM original.

    I really think there is something preventing it sparking or injecting fuel, or somehow the timing is out.
    I will check all the fuses in the morning. I will also swap out the throttle body I have for a known working one.
     
    #23 daley, Apr 10, 2024
  4. ASRDogman

    ASRDogman Senior Member

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    You should spray some carb cleaner or starter fluid in the intake when it's
    trying to start, take the air filter out. If it starts, you know it's not getting fuel.

    If it was running with the other engine, then something is probably not connected.
    It's easy to miss something. Like a vacuum hose?
     
    #24 ASRDogman, Apr 11, 2024
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    Easy hose to miss is the PCV to intake manifold connection; it needs to be connected after the intake manifold is dropped in, and out of sight is out of mind.
     
    #25 Mendel Leisk, Apr 11, 2024
  6. Danno5060

    Danno5060 Member

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    A bad O2 sensor wire also caused my Gen 3 to run rough and have trouble starting.
     
    #26 Danno5060, Apr 11, 2024
  7. daley

    daley Junior Member

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    Ok so I played around with it today. Engine is running but severe shaking/knocking still happening.

    I put new plugs, swapped o2 sensor, checked all hoses/connections, charged battery, disconnected battery for an hour.

    It will start and run and heat up and shows no codes now, however there is a severe shaking/knocking coming from the transmission side of the engine.
    If I put it in drive and have my foot on the brake the knocking goes away and becomes more of a wobble feeling. Car will move forward and back and no check engine lights are on.

    The engine itself sounds good but the knocking/shaking, I need to fix.

    Could this be a problem with the transmission flex plate? I used the one that came on the JDM engine.

    Am I right in thinking if this was computer related I would see some codes?
    Thanks for all your advice and support everyone, It is very much appreciated
     
    #27 daley, Apr 11, 2024
  8. rjparker

    rjparker Tu Humilde Sirviente

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    #28 rjparker, Apr 11, 2024
  9. C-in-DC

    C-in-DC Member

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    if it’s a gen4 Jdm engine I thought the clutch plate needed to be replaced with the gen 3 plate? They’re different sizes.
     
    #29 C-in-DC, Apr 11, 2024
  10. daley

    daley Junior Member

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    I got it going!!!

    Two of the connectors to injectors had bad wires, they looked ok but following the repair manuals diagnostics led to testing the pins out and they failed so soldered new connectors on for now to test and it fired right up, will de pin and do properly now I know it runs!
     
    #30 daley, Apr 17, 2024
    C-in-DC, Danno5060 and ASRDogman like this.
  11. rjparker

    rjparker Tu Humilde Sirviente

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    Looks can be deceiving and it looks like you caught her in the act and straightened her out prior to divorce.

    Its always something simple in the end. Next time don’t pull so hard on the wires when disconnecting.
     
    #31 rjparker, Apr 17, 2024
    Danno5060 likes this.
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