Impulse absorption plate (between ICE and transaxle input) needs replacement

Discussion in 'Gen 3 Prius Technical Discussion' started by donzoh1, Sep 28, 2022.

  1. donzoh1

    donzoh1 Active Member

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    It's clanking quite a bit when HV battery is being charged. This Gen 3 has 180K so I'm guessing HV might be questionable anyway. I'm thinking of letting it idle for awhile just to charge it up though as it might be another month before I get it going again. Depending on the quality of the HV battery, how long can they safely go without being charged or used?
     
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    Is engine coolant level in reservoir stable? Ever cleaned the Exhaust Gas Recirculation system?
     
  3. donzoh1

    donzoh1 Active Member

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    Coolant I think is good. I'm betting there's an EGR issue and that caused a miss which caused the broken plate springs. I found pieces of the springs in the neighborhood of the starter access plate when they broke.
     
  4. ChapmanF

    ChapmanF Senior Member

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    Ok, you confirmed broken springs, so there has been a misfire going on for a while.

    You definitely want to correct the misfire, in addition to replacing the damper.

    Avoid the mistake of thinking EGR is the only cause of misfiring. Find the cause with a proper diagnosis. For it to be because of EGR, you'd want to see a pattern connecting it to when EGR is and isn't active.

    Sometimes (not nearly always), misfiring may be a result of a head gasket failure. In those cases, while some may speculate that the failure was caused by X, Y, or Z, the problem by that point is the gasket, and fixing X, Y, or Z will not fix it.
     
    #4 ChapmanF, Sep 28, 2022
    Last edited: Sep 28, 2022
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  5. Mendel Leisk

    Mendel Leisk Senior Member

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    Any lights, codes?
     
  6. Tombukt2

    Tombukt2 Senior Member

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    Engine time . Get ready .
     
  7. bisco

    bisco cookie crumbler

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    a good battery can sit for 6-12 months, but who knows how good it is?
     
  8. donzoh1

    donzoh1 Active Member

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    My idea at this point is that the ICE must be completely removed to replace the damper anyway. Since I can pick up a junkyard engine locally from a crashed Gen 3 for 200 or less and there could be multiple problems with this one, I'm considering that. Could a normal bi-directional scanner show me the EGR function relative to misfire or would TechStream be needed for that? I'd probably do a leakdown test to be sure the ICE doesn't a more serious problem relating to the misfire.
     
  9. Tombukt2

    Tombukt2 Senior Member

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    What's the mileage on the $200 engine if you can get any idea of that it's out of another Prius it's going to probably be close to 200k at this point but maybe not but that's a slight maybe generally speaking. You try finding a Corolla with mileage much less than that almost impossible you have to be extremely lucky.
     
  10. Mendel Leisk

    Mendel Leisk Senior Member

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    A long neglected EGR cleanout likely caused a head gasket failure, and the misfire is likely due to the failed head gasket, as is the broken damper.

    Fix the head gasket and damper, and immediately thereafter clean the EGR (including intake manifold).
     
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  11. Tombukt2

    Tombukt2 Senior Member

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    If you've been rocking that flex plate or torque plate back and forth and broke springs you need to be looking at your rods connecting rods big and little end connected to the crank in the Pistons That's highly likely you're going to find stuff out of spec the engine design allows for it.
     
  12. donzoh1

    donzoh1 Active Member

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    I think the later Gen 3 cars can frequently be found around 100K but of course, they also could be much higher. I've had some luck getting VIN reports that can get pretty close to the mileage or sometimes found the VIN on Copart where the listing showed the mileage. I've also called Toyota repair techs at dealerships and gotten some good info from them on particular VINs. Gotta schmooze a bit sometimes. Sometimes, I find maintenance info in the glove box. I pull dipsticks and look under Oil Filler Caps. But it's still kind of a Box of Chocolates in that you don't know for sure what you're going to get. Most yards will also take the motor back for future credit if the motor turns out bad, but of course that doesn't compensate me for the hassle factor. I still think the risk/reward equation favors the junkyard option when you consider the prices of Ebay engines or other options.
     
  13. donzoh1

    donzoh1 Active Member

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    Excellent suggestions here. I can do the head gasket for even less cost and hassle than the junkyard ICE. I will probably remove the cylinder head or check the bores with a scope to get an idea of how much wear there is. The motor also has an oil consumption problem that results in oil coating the rear bumper so I need to eliminate that if I keep it.
     
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  14. donzoh1

    donzoh1 Active Member

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    Keep in mind that this 200 dollar engine is one I pull myself from the junkyard. If I pay someone else to do it, there's another 100 buck at least. Plus, I'm transporting the engine, etc. But, I can also scope the cylinders if I want and get a good idea of head gasket, etc. by looking at oil cap and dipstick. It's not surefire but I also get a 30 day guarantee of engine condition (store credit).
     
  15. Tombukt2

    Tombukt2 Senior Member

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    Yep understood I can do the same at a lot of places here in the southeast but here again before I do all this manual labor that now is very taxing at my age I would like to kind of make sure I'm doing this for valid reasons just because I'm paying $200 doesn't mean I'm going to accept any old kind of nonsense I would rather pay close to a thousand and have a low mileage takeout from another country Japan where these cars are built that nobody here has had a chance to log a quarter million miles on and have it worked on by every service station on the corner or what have you to me that extra $800 is kind of well spent If you're really poor and have other issues of family and house payments and all this may not be the case. If you have the time and plenty of brawn and don't mind doing this a bit then by all means have had it sure.