livingfossil5000

Confirmed my Amazon AC Delco was dead on arrival
Lesson: Test KS voltage and resistance with multimeter during installation before putting manifold back on

More here:
https://www.corvetteforum.com/forums...reappears.html

Shadyraymond

I basically am the OP in here. I've bought and installed two OEM sets of sensors and harnesses and still getting the code. Will buy the NAPA sensor and report back

epimetheus-lee

Had your problem and using your post as good advice, I bought the Echlin brand of Knock Sensors ($$) and new wire harness from NAPA. Now I have no DTC knock codes after I got everything back together. BTW--- Re-attaching that vacuum hose fitting on the back of the intake manifold was a real PIA. Ended up adding extra vacuum hose and a nipple fitting to get it connected. Priced at about double the Doorman and No-name brands, but worth my time in not taking the intake and fuel rails off again.


Jan 2024 Edit: Status update - NAPA Echlin knock sensors are still going strong even on our latest -3 degree start up morning. No error codes and still running strong for bone stock.

Shadyraymond

Drove about 30 miles with the new napa knock sensors and no codes. Weird how 4 gm oem knock sensors failed me

James Dean

Sadly I encountered the same issue when doing my oil pressure sensor relocation.

My original harness fell apart so I got a new Dorman harness and Dorman sensors, Dorman sensors again, AC Delco Advanced Sensors, and Summit Racing AC Delco Sensors

GM seems to have them backordered for haven't tried theirs. The best of the sensors could get 0.07 volts of AC current and all tested fine for resistance.

Guess I'm going to try the NAPA harness and sensors and see if that handles it.
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​​​​edit:
The Delphi DSK sensors are made in Mexico and on a bench test they wouldn't read over .24V of AC voltage and I was worried about my Vice.

I grabbed the NAPA ECH branded ones and tested as well. .39V has been the highest of the batches I have gotten. Sensors looked EXACTLY the same, but the bench test doesn't lie.

I just installed them and I'll also report back

Edit 2: Installed the NAPA sensors and NAPA harness that is exactly the same as Dorman's... 50 miles down today and no codes! Lots of high and low rpm. Bits of stop and go, and all checks have been passed on the scan tool. Seems it's fixed!

BACNBLK

Great thread, getting ready to change out my KS & Harness

Curious if the above Napa Parts # DKS238SB & Harness # 730-6778 are the same for both the Z06 and my standard 2001 LS ( EDIT: The answer is YES, THEY ARE THE SAME)

Thanks in advance!

FOGeologist

This thread is a good one to stick into the ol' memory banks, not that they're all that great anymore themselves.

Good work, people! If I ever spot a crumbly harness, I'll know what to do.

jim993

New knock sensors can easily be damaged by torqueing them too much during installation. Make sure you torque to FSM spec.

MetalMan2

This is true, but they have to work in the first place!

BACNBLK

Followed the advice from all the great folks above

New Napa DKS238 Sensors and a brand New Harness, super easy to remove and replace, No issues and No codes!

Also replaced the Oil Sensor, Installed a OS Relocation Kit, replaced Manifold Gaskets, everything received a good cleaning, everything runs great, no leaks and after putting this off for way to long finally got my Oil Pressure back!

I wont lie it took me the better part of a full day, but I went real slow and cleaned every bolt/clip/hose that came off, she looks better than new!

cdee63

Found this thread doing a search. I have also been having issues with my replacement Delco sensors/Dorman harness, the usual low circuit voltage code. I have an LS6 intake and valley cover upgrade planned, I will also replace the K/S and harness with NAPA parts. Thanks for all the info fellas!