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EGR cleaning increases MPG?

Discussion in 'Gen 3 Prius Fuel Economy' started by Jason Zarraga, Jan 30, 2018.

  1. Jason Zarraga

    Jason Zarraga Junior Member

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    Thanks to @NutzAboutBolts , I've successfully cleaned up my EGR module. Thank you man, you rock!

    I've noticed an improvement of mileage at moderate speeds. Is this common or is this just wishful thinking on my part? If so, why? I don't understand why recirculating burned gasses into the combustion chamber and reburning it improves MPG.
     
    #1 Jason Zarraga, Jan 30, 2018
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  2. MelonPrius

    MelonPrius Senior Member

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    Wait until you fill up your next tank(s) and see how that compares to your previous mpg.
     
    #2 MelonPrius, Jan 30, 2018
  3. Raytheeagle

    Raytheeagle Senior Member

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    How many miles on your Prius?

    How clogged was the cooler?

    I swapped out our EGR cooler about 50 k miles ago and the mpg increased slightly :).

    But I also slowed down a bit which helps mpg more;).

    Cleaning the cooler goes further with reducing other failures than the mog improvement. Hope that helps (y).
     
    #3 Raytheeagle, Jan 30, 2018
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  4. Jason Zarraga

    Jason Zarraga Junior Member

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    I just broke 150k miles and I've always driven like a grandma haha

    What's the collet you're referring to?
     
    #4 Jason Zarraga, Jan 30, 2018
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  5. Raytheeagle

    Raytheeagle Senior Member

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    The egr cooler is just upstream of the egr valve. If you haven’t cleaned that at 150 k miles, that will need to be addressed.
     
    #5 Raytheeagle, Jan 31, 2018
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  6. Jason Zarraga

    Jason Zarraga Junior Member

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    Is the cooler where the radiator lines go into? I cleaned that as well as the valve. Are we talking about the same thing, the block with fins inside?
     
    #6 Jason Zarraga, Jan 31, 2018
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  7. mjoo

    mjoo Senior Member

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    EGR does a few things for the engine. It lowers combustion temperatures thus improving the knock limit and allows advanced timing. Heating more air with the same amount of fuel improves the work done on the piston. Toyota says it allows for faster ignition (see "tumble ratio") which means more efficient combustion. And lastly, EGR lowers throttle losses at part throttle - this is what you're noticing.

    Toyota Global Site | Engine (Atkinson-cycle)[HV]

    Toyota's Next-Gen Prius to Possess Engine with 40% Thermal Efficiency - World Industrial Reporter


    Pixel XL ?
     
    #7 mjoo, Jan 31, 2018
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  8. mjoo

    mjoo Senior Member

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    #8 mjoo, Jan 31, 2018
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  9. padroo

    padroo Senior Member

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    EGR systems cause a lot of driveability issues with all cars.
     
    #9 padroo, Jan 31, 2018
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