Coolant loss- any connection to a fuel injector

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by C Clay, Dec 2, 2025 at 6:06 AM.

  1. priumium

    priumium Member

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    Ah, but also a measurement of compressors capacity is pressure, so that’s air volume/time unit (normally one minute), that would end up at apx 4.5 bar/65 PSI (minute volume). Correct? That’s good enough.
     
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  2. indel

    indel Member

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    Most people who are cleaning the coolers are first using some kind of solvent, then blowing it out with a pressure washer before finally spraying air to make the passages completely dry. Merv and many others have used wires to disengage the carbonized dust from the passages. To date I have not found a wire that works for me.

    In the used JDM cooler I bought from ebay, every little passage has a slanted metal plate inside it dividing the the passage into two triangles. I do not know if that's the standard design but it makes it harder to insert wires in there. I will report back once I receive my brand new cooler today.
     
  3. priumium

    priumium Member

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    Yep, I am aware and also considered this. But as soon as you add liquid to this ash it’s much harder to blow out (with air).
     
  4. rjparker

    rjparker Tu Humilde Sirviente

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    The cooler can be clogged with a hard sticky material if the engine is burning oil. Otherwise it is fine. A good gen3 engine will show no observable oil loss in 5k miles. An oil burner can be fixed with pistons and rings demonstrated thousands of times under warranty.

    A wire chucked on a drill does work on the serious sticky oil residue.
     
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  5. indel

    indel Member

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    Can you provide the gauge or example of the type of wire you used for this purpose? A link would be very helpful.
     
  6. priumium

    priumium Member

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    A good G3 engine will therefore not have oily residue in the EGR cooler.
     
  7. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Guess I’m an outlier: dipstick never budges, and when I clean the EGR valve, cooler, pipe and the intake manifold (twice now), the “ash” is closer to anthracite coal, lol.
     
  8. indel

    indel Member

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    My 2012 Two has 142.5K miles. I bought it just a little over 1K miles ago. So far, my oil level has not dropped any at all and I am hoping the streak continues.
     
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  9. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Yeah, until partway through model year 2014, they’ve got low tension piston rings. Kinda like being born with a heart defect.
     
  10. rjparker

    rjparker Tu Humilde Sirviente

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    I did it many moons ago (maybe 120 moons kemosahbee) but it was something like a thin clothes hanger wire - stiff but still flexible enough to make a slight bend.

    Chucked in a drill, you literally bore through the gunk. Start with a short piece and progress to 2/3 length.

    This was after several days in a professional parts cleaner failed and we simply bought a new one.

    The clogged cooler was later cleaned by rotating wire followed by solvents over many more days as a passion project (it will not and did not defeat me!).

    It found a new home on the next gen3 needing one - recovering most of the new cooler's cost. The cleaning labor was a sunk cost, something most shops can't afford to charge for and keep customers when a new one is 1.5 hours labor and much more efficient. Plus no lye in the eye.
     
    #30 rjparker, Dec 5, 2025 at 3:10 PM
    Last edited: Dec 5, 2025 at 3:33 PM
  11. indel

    indel Member

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    Do you have to remove the head to
    I haven't used that type of clothes hanger in a long time, but if memory serves right, those wires were pretty thick. I did have some luck inserting a picture frame hanging wire (the thinnest I could find) in there, but it bends too easily and it might break if I try rotating it inside. That would be a terrible thing to happen.
     
  12. Mendel Leisk

    Mendel Leisk MMX GEN III

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    I found regular cable TV wire about the right gauge. There's a "heavier duty" version, and it was slightly too thick.
     
  13. priumium

    priumium Member

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    Hmm, what is that? Sounds dry to me.

    If the deposits are dry thru the entire passage into the intake, then the PCV system works as intended indeed.
     
    #33 priumium, Dec 6, 2025 at 8:20 AM
    Last edited: Dec 6, 2025 at 8:35 AM
  14. C Clay

    C Clay Member

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    thanks for the discussions- Here's where I am at today- many cold damp days here, and I work for a large company that starts with an A- I'm putting in about 70+ hours a week and 12-15 hours of traveling. Not much time for Prius working until I get more time and/or the sun shines.

    Fuel System Cleaner 500 miles/7 days ago and no death rattle .... until

    I go to add Antifreeze and after reading the manual- fill the reservoir up to the B mark and let it run in maintenance mode. It knocked on me this time. Isn't there a relationship to the pressure when you release the cap/leave it on/off and these hard knocks upon starting? I know some seem to think you can take the o ring off or something and it eliminates hard starts. I don't necessarily subscribe to this thought process, just asking the question. How much antifreeze was needed? Maybe 1 inch. I've never added any that I can think of this year.

    This car doesn't burn any oil by the way, nothing appreciable. I no longer have to add any between 5000 miles changes.

    I'm kind of in a holding pattern- but if it were August, I'd really like to look at cleaning the manifold and looking at the EGR cooler. As far as the EGR test mentioned above with the spatula - if this isn't knocking consistently, I don't think that would prove out any test would it?