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Overheating - Burning Oil - What to do?

Discussion in 'Gen 3 Prius Technical Discussion' started by aspiringnobody, Feb 27, 2023.

  1. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    When I was using a ScanGauge, day-to-day engine coolant temps would be around 165F. The only time I’d see 190~195F was going up a local ski mountain (Grouse).

    It seems a common propensity of these transplant jobs to run at the hot end. I think @ChapmanF mentioned this too.
     
  2. Ryan Will

    Ryan Will Member

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    165F? Wow, that's pretty good! I am at 194F-199F on my daily commutes. Usually between 195F-197F, 199F if I'm going uphill.
     
  3. ChapmanF

    ChapmanF Senior Member

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    Yes, from what I've read of them, I might go somewhat stronger than 'propensity', to somewhere in the neighborhood of 'nagging unsolved problem'.
     
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  4. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Hey, I got my dictionary out today, but yeah, I'll try to be more succinct...
     
  5. sam spade 2

    sam spade 2 Senior Member

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    Not if it was designed to run at 190 or more.
    LOW engine temperatures tends to promote the formation of crankcase SLUDGE.
     
  6. aspiringnobody

    aspiringnobody Junior Member

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    It's the autozone one. The dealership said it was a week to get one in stock. Not ideal but I didn't really have time to wait to either fix this car or buy another car so I got what was in stock. It was $390 but I used a discount code so it was me like $300.

    I would have ordered the one with the Toyota logo ground off probably if I had more time.

    Torque is on 24/7 now so at least I'll have warning next time. 200 miles in the fluid is still at the same level so that's good at least.

    Highest I've seen the temp is 199 but it's always gotten that high on extended load. I probably should have changed the thermostat while I had it out.
     
  7. Brian1954

    Brian1954 Senior Member

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    If you need to get your car fixed ASAP, you use the parts that you can find .

    I am sure that you will keep a close watch of the ECT and coolant level over the next couple of months.

    The only time that I see ECT as high as 197 to 201F is driving up a steep hill with almost full throttle. I think you will be fine with the original thermostat, with only 147k miles on your car. I am surprised that you have an oil consumption problem. I assume that you do alot of highway driving at high speed. That is when you will see the most oil usage.

    EDIT: I see in your post #18 that your highway speed was 79.8 mph. If you slow down, your oil consumption will also decrease.....HaHa...

    Posted via the PriusChat mobile app.
     
    #27 Brian1954, Mar 2, 2023
    Last edited: Mar 2, 2023
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  8. CR94

    CR94 Senior Member

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    Really? That's not what my ScanGauge says. More like 190°F to 195°F if the engine has been running continuously long enough to open the thermostat. Much lower during fuel-cut on downhills, of course.
     
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  9. aspiringnobody

    aspiringnobody Junior Member

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    I-94 in the Chicago suburbs -- any slower than 80 and you're roadkill. I'm 99% of the time the guy in the prius doing five under the limit but that highway scares the shit out of me so I at least try to do 80 ;)
     
  10. sam spade 2

    sam spade 2 Senior Member

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    If that involves having a dongle plugged into the OBD port, it will be hot all the time and can run your 12 V battery down if not driven enough.
     
  11. rjparker

    rjparker Tu Humilde Sirviente

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    Complete waste of money on this engine that is burning a quart every 500 miles.

    Mendel's engine is never warming up. Normal is around 195f. The car has thermal cycling issues where it will cool quickly on long idles or downhills.

    I also use the $30 P10 which includes a user set alarm. This is after full temp and five minutes of engine off on a downhill.

    4D6D2A76-43AB-4578-9FC2-8D656B8B1595.jpeg

    If you want to keep this car get a rebuilt engine with new rings. Too many spend several thousand on baby steps and still have a ruined engine.

    339257FF-0D7B-4035-95B4-FA78C14C9DC3.jpeg
    Hybrid Pit and others now have a lower cost version with new rings and the same pistons. I would get the pistons.

    Egr and pcv are side effects of the more fundamental design flaws in the cylinder oil management and cooling. Only a few at Priuschat suggest the egr as root cause. You won't hear it from Toyota Master mechanics.

    After you get a rebuilt engine change oil at 1000 miles and then every 5k. Obviously clean the egr and replace the intake.

    Finally Toyota Financial has much lower interest with good credit on select new cars. It is essentially a corporate discount.
     

    Attached Files:

    #31 rjparker, Mar 4, 2023
    Last edited: Mar 4, 2023
  12. HelloMcFly

    HelloMcFly Member

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    have a member from Chicago shipping me his car to have a swap done. You’re welcome to reach out to me. I have a Gen 4 swap in my garage ready to go
     
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  13. aspiringnobody

    aspiringnobody Junior Member

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    Engine seems to be running okay still with the replaced water pump. I really want to get rid of the car asap (it's really falling apart). Interest rates have totally priced me out of the market though. I'm gonna keep driving it until the engine goes I guess. I'll have to replace the motor when it comes to that.

    New problem is the brakes. Always something.
     
  14. tnt4him

    tnt4him Junior Member

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    You can look into buying a used Japanese engine for that car. In Japan they have a law that an engine cannot be over 50k without paying a high registration tax. People opt to buy a new car instead and thousands of engines are pulled and sent the states for about $500 each. I Craigslist Japanese engine and found many locations.
     
  15. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    #35 Mendel Leisk, Apr 13, 2023
    Last edited: Apr 13, 2023
  16. ColoradoCrow

    ColoradoCrow Active Member

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    Interested in the P10 Scanguage it just has a 6' cable that plugs into the ODB port full time? This will certainly help older cars from overheating