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Knock sensors, UGH!

Discussion in 'Gearheads' started by dlbleak, Jan 16, 2021.

  1. dlbleak

    dlbleak Super Moderator Staff Member

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    Check out the second pic in my original post. The sensors are under those two circular caps. They don’t fit tightly, in fact they just sit in/on the holes. The moisture and dust just build up in the back one. I silicone them in when I do the sensors.
     
  2. Snattlerake

    Snattlerake Sharpshooter

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    upload_2021-1-16_21-4-1.png
    You mean these?
     
  3. dlbleak

    dlbleak Super Moderator Staff Member

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  4. OkdRooster

    OkdRooster Marksman

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    The knock sensors are a piezo electric device that as detonation occurs in the engine produce an ac signal that rides on the 5volt reference signal. The pcm uses this signal along with other sensor data to control engine timing.

    Moving or reengineering the location is not a good idea.
     
  5. mouthpiece

    mouthpiece Sharpshooter

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    I also Suggest NOT BUYING from amazon unless your mechanic has experience with the sellers product.
    One of my boys and I tore the top end off his car to replace the 2 knock sensors since the diagnosis was knock sensors and O2. Replaced everything and got it back together and still no good

    After racking our brains and gutting the catalytic converter because of being plugged we still couldn't get it to run. Took it to my mechanic buddy who said "O2 sensors" AGAIN.
    He pops the top of the engine off again and checks them and they are not communicating with the computer of the car. **** knock sensors from amazon.
    2 more O2 sensors from a know good supplier or OEM. AND A FEW HUNDRED DOLLARS MORE.
    At this point the car already had new spark plugs, coil packs, and several other things
     
    sedona likes this.
  6. dennishoddy

    dennishoddy Sharpshooter

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    @SPDgins, I’m the proud owner of a new 2020 F-250 with the 7.3 liter Godzilla engine.
    Gobs of HP at 430 but I keep reading that with a simple tune that HP and Torque rating can be significantly improved.
    Your buddy tune Ford products?
     
  7. SPDguns

    SPDguns Sharpshooter

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    That is correct, a tune can make those engines SCREAM. I'm pretty sure he doesn't do Fords, I'l PM you his name and phone number. If he doesn't do them, maybe he can recommend someone for you. Let us know how it turns out!
     
    dennishoddy likes this.
  8. zipty6

    zipty6 Sharpshooter

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    I can see the oil pressure sending unit that I replaced on my 03 a few weekends ago. It looks a lot easier to reach in your first picture than is was on mine.
     
  9. dlbleak

    dlbleak Super Moderator Staff Member

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    Yes indeed, I did the switch too. Should have mentioned it earlier. If you go in there for either job, just do both. It could save a headache later.
     
    zipty6 likes this.

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