# SR20 PFC high knock.

**URL:** <https://forums.speedlife.net/t/sr20-pfc-high-knock/127145>\
**Category:** SON240sx Automotive\
**Created:** [August 12, 2009, 5:22pm UTC](https://forums.speedlife.net/t/sr20-pfc-high-knock/127145 "2009-08-12T17:22:43Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Souljourner](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@Souljourner](https://forums.speedlife.net/u/Souljourner)\
**Post date:** [August 13, 2009, 2:30pm UTC](https://forums.speedlife.net/t/sr20-pfc-high-knock/127145/9 "2009-08-13T14:30:23Z")

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> [@FS: Window Media Center Software](https://forums.speedlife.net/t/fs-window-media-center-software/23491/8):
>
> You need to determine if it is actually knocking or if it is just making noise. The knock value on the PFC is just a graphical representation of knock sensor voltage. Just because the number is 100 does not mean it is knocking.
> 
> Is this a stock block?

Stock block. How would you determine if it is really knocking vs. noise?

John

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