Accidentally submerged MAP sensor on intake manifold in hot water and Purple Power

Discussion in 'Gen 3 Prius Main Forum' started by GustoGuy, May 20, 2026 at 10:19 PM.

  1. GustoGuy

    GustoGuy Member

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    I am cleaning my intake manifold and I accidentally forgot to remove the MAP sensor which is down by the throttle body on the intake manifold and I was blasting it out with Brake cleaner first and small pipe cleaner nylon brushes and I finally soaked it in purple power and hot water. I heard you can clean them with mass air flow sensor spray cleaner. Did I ruin the sensor by submerging it? If so what is a decent non Denso brand MAP sensor brand (Delphi?) I can buy to replace the sensor. I seen that the brand name sensors are really expensive. I guess I could also clean it gently with Mass Air flow sensor cleaner and put it together and see if it throws a code too.
     
    #1 GustoGuy, May 20, 2026 at 10:19 PM
    Last edited: May 20, 2026 at 10:58 PM
  2. CR94

    CR94 Senior Member

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    Let us know how that turns out.
    My guess is that it will be ok.
     
    #2 CR94, May 20, 2026 at 11:16 PM
    Mendel Leisk likes this.
  3. ChapmanF

    ChapmanF Senior Member

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    All it has to do is say what the air pressure is. You could plug it in and watch the reading on a scan tool.

    If it's close to what your local weather station says when the engine is off, there you go.
     
    #3 ChapmanF, May 20, 2026 at 11:57 PM
  4. GustoGuy

    GustoGuy Member

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    My car has been acting up were it will sporadicly and randomly start to idle roughly. I decided to clean my EGR cooler and EGR valve and now I am cleaning the intake manifold. I read that the egr valve and cooler and intake manifold can cause the car to run roughly especially if they are full of packed in exhaust carbon deposits
     
    #4 GustoGuy, May 21, 2026 at 1:32 AM
    Last edited: May 21, 2026 at 1:43 AM
  5. GustoGuy

    GustoGuy Member

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    I have a Creeder Launch scan tool. I don't have Techstream. I doubt if my reader can give anything but normal or abnormal function codes. Hopefully it works after being washed and I get no codes
     
    #5 GustoGuy, May 21, 2026 at 1:32 AM
  6. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Purple Power is caustic i believe? MAP sensor may be ok, probably will be, but the metal embeds in the intake manifold will react with caustic residue, and the intake manifold hold-down nuts and bolts. In your shoes I would very thoroughly rinse the intake manifold, blow everything bone-dry, and spritz all the embeds with WD40 or similar.

    The EGR cooler, being stainless, and very difficult to clean, is the only component I would clean with caustic solution. Everything else I’d stick to conservative amounts of brake cleaner, rags, brushes and elbow grease.

    I know this, from personal experience using similar oxi-clean solution on the intake manifold. Once.
     
    #6 Mendel Leisk, May 21, 2026 at 8:12 AM
    Last edited: May 21, 2026 at 12:18 PM
  7. ASRDogman

    ASRDogman Senior Member

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    You may get lucky and it's okay. The only way to know is drive the car and see if you
    get any error codes for it. You should clean it with MAP/MAF cleaner and hope for the best.

    If you need to replace it, replace it with only one from Toyota. Seems no one has had
    success with aftermarket ones, no matter what brand.

     
    #7 ASRDogman, May 21, 2026 at 11:58 AM
  8. ChapmanF

    ChapmanF Senior Member

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    Or look at the reading on a scan tool and compare it to the known pressure.

    Some sensors are tricky to test. For this one you don't need much more than a barometer, or a local weather page and the internet.
     
    #8 ChapmanF, May 21, 2026 at 4:43 PM
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