Knock Counts
Melting Slicks
Joined: Jul 2005
Posts: 2,152
Likes: 300
Is your car stock? What year?
Sometimes with aftermarket modifications like roller rockers, headers, more aggressive cams, etc... things can get a little noisier and the knock sensor will pick that up and start recording knock counts (even if it doesn't get to the point of retarding timing)
Also an incorrect sensor can cause it. Knock sensors are tuned for particular engines (i.e.. 305 vs 350 for example).
Sometimes with aftermarket modifications like roller rockers, headers, more aggressive cams, etc... things can get a little noisier and the knock sensor will pick that up and start recording knock counts (even if it doesn't get to the point of retarding timing)
Also an incorrect sensor can cause it. Knock sensors are tuned for particular engines (i.e.. 305 vs 350 for example).
Tech Contributor
Joined: Jun 2004
Posts: 20,779
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Thread Starter
Instructor
Joined: Apr 2022
Posts: 187
Likes: 31
From: South Texas
It's a '96 LT1. Roller rockers and 52mmTB, are the only major mods done by the PO. During idle, I get 2.4K knocks, 0 knock retard. Should I only be concerned if I get knock retard?
Is your car stock? What year?
Sometimes with aftermarket modifications like roller rockers, headers, more aggressive cams, etc... things can get a little noisier and the knock sensor will pick that up and start recording knock counts (even if it doesn't get to the point of retarding timing)
Also an incorrect sensor can cause it. Knock sensors are tuned for particular engines (i.e.. 305 vs 350 for example).
Sometimes with aftermarket modifications like roller rockers, headers, more aggressive cams, etc... things can get a little noisier and the knock sensor will pick that up and start recording knock counts (even if it doesn't get to the point of retarding timing)
Also an incorrect sensor can cause it. Knock sensors are tuned for particular engines (i.e.. 305 vs 350 for example).
Melting Slicks
Joined: Jul 2005
Posts: 2,152
Likes: 300
Questions about real/false knock are common on thirdgen.org. Couple of sample threads below... the first one is mine, where I was troubleshooting what I determined to be mostly false knock. But if you search you'll find tons of threads. Granted they're all about Gen1 small blocks, but the logic and diagnostics are largely going to be the same.
https://www.thirdgen.org/forums/diy-...tard-real.html
https://www.thirdgen.org/forums/tpi/...retarding.html
Advanced
Joined: Mar 2024
Posts: 76
Likes: 20
From: Dayton
I ran across this awhile back. I read don't worry about the counts only the knock retard. The counts start at 0 and go up to 60k or so on a loop. Looking at a few of my logs I noticed my counts went from 79 to 12k before I turned the key to start the engine. It stays at the 12k through the log unless you get spark retard at which it may go up 50 points. It also depends on where the log starts in the loop. Another started at 700 counts and remained there until I shut the car off and it climbed to 60k. I did notice couple times the count increased 40 or so and there was no knock retard. Must be the norm, 1993 lt1.
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Advanced
Joined: Mar 2024
Posts: 76
Likes: 20
From: Dayton
Safety Car
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From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
use this as a search term
how to tune a 1996 lt1 knock module to be less sensitive
https://www.garretttuning.com/produc...DbEV_RgBNDIw3w
Last edited by drcook; Sep 24, 2024 at 10:34 PM. Reason: corrected terminology
Thread Starter
Instructor
Joined: Apr 2022
Posts: 187
Likes: 31
From: South Texas
In a nutshell, it could be a false reading is what I gathered. My MAP readings look good, plus I have no knock retard, but my egr has been deleted. Shouldn't the LT4 module help "quite" things down? (I got confused between the module vs knock senor). As far a stock knock sensors, I'm more than 100% sure they're the originals, but I'll check anyways. The car was badly neglected, when I got it.
Last edited by TheKodiak; Sep 25, 2024 at 07:41 AM.