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Old 08-11-2008, 02:39 AM   #1
subaruNV
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Default knock sensor tq Specs

After my motor was built the guy that put it back into my car over tightend it and i was showing random knock but he went back and fixed the tq spec but it stilll showing a little random knock.. could he have damaged the sensor by over tq ing it and should i get i new one to stop all the knock
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Old 08-11-2008, 10:43 AM   #2
mick_the_ginge
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Yes it can be damaged by over tightening it. It should be no more than 15 ftlbs as I remember it. It also had to be in the correct orientation as well.

Are you sure it's not real knock?
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Old 08-11-2008, 03:24 PM   #3
subaruNV
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well its very random and u cant hear anything really. some times it knock during shifts sometimes it doesnt
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Old 08-11-2008, 06:35 PM   #4
charliew
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I read on I think Autospeed that a good listening device is better for tuners than relying on the stock knock sensor if you want to be real sure of knock threshold.
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Old 08-11-2008, 07:40 PM   #5
subaruNV
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well i found the random knock when i got tuned by my tuner. it was from his data log.
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Old 08-11-2008, 09:46 PM   #6
Rene2.5RS
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I have not checked to reference other models but the 06 wrx is 17.4 ft/lbs to be exact. Here is the page from the service manual, make note of the orientation of the sensor as well.

-Rene

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Old 08-11-2008, 11:03 PM   #7
GentlemenStylez
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Hehe. Installing the knock sensor in the wrong direction--I found to be a bit difficult due to the confined space and relatively short wire connections.
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Old 08-12-2008, 01:47 AM   #8
subaruNV
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could replacing this possibly help with my problem....the very and i mean very rendom knock after over tq ing the last one
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Old 08-12-2008, 07:28 AM   #9
GentlemenStylez
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Since the last one was overtorqued, I would replace it regardless of any other factor. It's sensitive equipment that needs to be installed properly to function properly. Who knows what could be wrong inside????

As far as knock is concerned, run higher octane fuel, that should help greatly with your knock problems. Just don't put any lead additives.
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