S2000 Under The Hood S2000 Technical and Mechanical discussions.

knock sensor broke off in block...no bueno

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Old 03-30-2024, 09:11 AM
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It takes a 24mm socket. I don't know the thread diameter, but guessing based on torque spec ~24lb/ft, I'd say it's 8mm threads at most. I can't believe the service manual tells you to remove the intake manifold as step one of removing the knock sensor. Ain't nobody got time for that.
Old 03-30-2024, 09:28 AM
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Originally Posted by Slowcrash_101
It takes a 24mm socket. I don't know the thread diameter, but guessing based on torque spec ~24lb/ft, I'd say it's 8mm threads at most. I can't believe the service manual tells you to remove the intake manifold as step one of removing the knock sensor. Ain't nobody got time for that.

I am going to have to take the intake manifold off because mine sheared off in the block like OP. He said he had to retap the threads was trying to figure out what thread depth and pitch was so I ensured I had the right tap on hand lol. Could not believe my eyes when the hex segment disassociated itself with the threaded end lol. Nonsense.
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Old 03-30-2024, 11:32 AM
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Possibly aftermarket sensor that came apart like that?
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Old 03-30-2024, 11:39 AM
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My condolences, the IM is harder to remove than the cylinder head is on this car.
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Old 03-30-2024, 03:13 PM
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i did this once on someone else's car doing a phenolic gasket. ended up having to remove mine to give them so i had to do this three times in a week. its poopy and a good reason to leave that damn bracket out.
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Old 03-31-2024, 09:27 AM
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Originally Posted by Slowcrash_101
My condolences, the IM is harder to remove than the cylinder head is on this car.
UGH!

All for a broken knock sensor. What a drag...
Old 04-01-2024, 06:48 AM
  #17  
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Old thread, revived from the dead

Originally Posted by Plant_s2k
This is old but did you manage to remove this?I’m in the same situation thanks
Yeah, i got it out with an extractor. Not a fun job

Don't use an aftermarket sensor, that should be the takeaway here.
Never again, i learned my lesson 1- they don't work, 2-you'll end up with this mess when you go to remove the non working sensor

Last edited by jsenclosure; 04-01-2024 at 07:17 AM.
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Old 04-01-2024, 10:18 AM
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out of curiousity, which aftermarket sensor did you go for? i went for an NTK and it seems to have died already
Old 04-01-2024, 10:36 AM
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Originally Posted by jsenclosure
Old thread, revived from the dead


Yeah, i got it out with an extractor. Not a fun job

Don't use an aftermarket sensor, that should be the takeaway here.
Never again, i learned my lesson 1- they don't work, 2-you'll end up with this mess when you go to remove the non working sensor
Sorry, to hear that.

But, thanks for posting this as a warning to all others. The genuine one may be expensive, but it probably is worth it --- considering the hassles of replacing a bad one.

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Old 04-01-2024, 10:49 AM
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Originally Posted by bad_driver
out of curiousity, which aftermarket sensor did you go for? i went for an NTK and it seems to have died already
someone revived this thread from 2013, my memory isn't that good lol
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