Knock Sensor cutaway

[Chevy366]

Well finally got the dreaded P0332 code due to water infiltrating the knock sensor recess cavity (filled with water after washing the engine) ruining the sensor and harness wire.
So asked the wife to order me a KS off Ebay, she did, actually 2, so you know where this is going, got them by UPS.
Long story short I removed the intake pulled out the old KS and put in the new KSers with old harness, first mistake, still got a code, so ordered a new harness, A M Automotive off Ebay -- Dorman, took the intake back off installed new harness, this time got two codes P0327 and P0332, original code was P0332 rear KS, crap, so finally ordered one new sensor from A M Automotive (great Ebay seller, highly recommend), Wells brand 'cause the front old one was good, put the new sensor in along with new harness and no codes.

So the knock sensors that were first ordered got me curious -- 'What made them not work?'

Well here we go, the answer -- If you guessed a resistor to fool an ohm test and a chunk of metal to add weight you would be right -- here are some pictures of the old KS (left) and Ebay KS (right) from Global Automotive (stay away from this seller on Ebay) rip-off.

In the cut away you can just see the blue resistor in the top left area of the judas part, trickery to fool.

I am posting this where ever I can in hopes to save someone else the misery and time, I have a video on YouTube of it as well.

Oh tip, black silicone sealant does not adhere to the aluminium valley cover used to seal the KS bonnet, so I used axle grease, works perfectly (old trick grease will dry and seal rubber part and will stick to the aluminium, grease use to be used as a head gasket sealer), do not put grease on KS just the outer part of the bonnet that seals KS recess.

[GMPX]

Oh dear, bad luck. But it was really interesting to see what was inside the original one, I had no idea.

[Move'n Up]

Wow, appreciate the insight (Pun Intended)

Thanks for sharing the details!

[Chevy366]

Oh dear, bad luck. But it was really interesting to see what was inside the original one, I had no idea.

Me either why I was curious as to what made them tick or click, or what ever they do. Learning curve!

Wow, appreciate the insight (Pun Intended)

Thanks for sharing the details!

Good one!
I searched and saw no one else that had cut one open and decided to do it and share with the community.

[joecar]

Post a link to your youtube video.

[joecar]

Good job thanks for cutting open and posting.

[Chevy366]

Link to video, video was impromptu so did not get everything I wanted to in it but it will suffice. https://youtu.be/Xavg9IqvBvA