Knock sensor modification?
Thread Starter
Instructor
Joined: Mar 2016
Posts: 184
Likes: 57
From: Bowling Green Ohio
2021 C5 of the Year Finalist - Unmodified
2020 C5 of the Year Finalist - Unmodified
Knock sensor modification?
A GM tech told me about using brass hardware to move out the knock sensor from the block to correct problems with false knock. I know I've seen this discussed but I was curious if anyone has seen this first hand and if it actually worked?? It sounded a little "bubba" but once I heard it was a fix used by dealers back then it made me curious.
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Scroll to post 11. The author is a reputable Corvette authority.
https://www.corvetteforum.com/forums...deadening.html
https://www.corvetteforum.com/forums...deadening.html
Instructor
Joined: Feb 2015
Posts: 234
Likes: 20
From: Stuart Florida
A GM tech told me about using brass hardware to move out the knock sensor from the block to correct problems with false knock. I know I've seen this discussed but I was curious if anyone has seen this first hand and if it actually worked?? It sounded a little "bubba" but once I heard it was a fix used by dealers back then it made me curious.
Advanced
Joined: Apr 2012
Posts: 95
Likes: 6
Scroll to post 11. The author is a reputable Corvette authority.
https://www.corvetteforum.com/forums...deadening.html
https://www.corvetteforum.com/forums...deadening.html
Originally Posted by Hib Halverson
There is *no* safe solution to the problem of false knock stemming from an increase in valve train noise broght on by a camshaft that is more aggressive than production cams *other than* using gasoline of higher octane than can be typically found from most sources.
Last edited by dorri732; May 2, 2017 at 02:18 PM. Reason: spelling
Safety Car
Joined: Dec 2012
Posts: 3,789
Likes: 1,694
From: Summerville SC
Not sure about moving the ks away from the block, but I believe that the knock sensors are specific to each engine, so if you might have just picked up one off the shelf, or from a parts guy who didn't need to look it up, you might have the wrong one, and that might be an issue. Just cause it fits doesn't mean it's right. My $.02.
Burning Brakes
Joined: Jun 2016
Posts: 761
Likes: 66
From: Fitzwilliam New Hampshire
I was told by a corvette tech, when I did a coolant flush and got LT4 knock sensors, that I should use the LT1 sensors sense that is what belongs in the car,(94 LT1) he said LT4 are less tolerant to knock, so I sent the LT4 sensors back and got the right LT1s. So I would say that LT4s are less sesitive to knock than LT1s.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Instructor
Joined: Mar 2016
Posts: 184
Likes: 57
From: Bowling Green Ohio
2021 C5 of the Year Finalist - Unmodified
2020 C5 of the Year Finalist - Unmodified
My reason for the post was mostly to flush out whether it was a myth or not. Apparently it does reduce the sensitivity of the sensor. I was wondering if someone tried it with no or little affect or, as posted above, someone who did it and it worked for them. I'm not trying to confirm it for my use or debate the right or wrong. Obviously if you're engine is knocking then bypassing the sensor is not correct. Do guys extend the sensor straight out with a coupling or 90 degree fitting? Or whatever works?
Thanks for the replies by the way. I find things like this interesting when guys have first hand experience.
Thanks for the replies by the way. I find things like this interesting when guys have first hand experience.
Advanced
Joined: Apr 2012
Posts: 95
Likes: 6
I was told by a corvette tech, when I did a coolant flush and got LT4 knock sensors, that I should use the LT1 sensors sense (sic) that is what belongs in the car,(94 LT1) he said LT4 are less tolerant to knock, so I sent the LT4 sensors back and got the right LT1s. So I would say that LT4s are less sesitive (sic) to knock than LT1s.
Advanced
Joined: Apr 2012
Posts: 95
Likes: 6
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Tech Contributor
Joined: Jun 2004
Posts: 20,847
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
A GM tech told me about using brass hardware to move out the knock sensor from the block to correct problems with false knock. I know I've seen this discussed but I was curious if anyone has seen this first hand and if it actually worked?? It sounded a little "bubba" but once I heard it was a fix used by dealers back then it made me curious.