How to fool the knock sensor
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,019
Likes: 2
From: Na
How to fool the knock sensor
I remember hearing about this a awhile back but looked through the archives and could not find it. It had something to do with replacing the knock sensor with a resistor to fool the computer in thinking that there is no knock coming from the sensor incase of false knock. Anyone have info on this? Thanks.
Melting Slicks
Joined: Oct 2000
Posts: 2,630
Likes: 10
From: Drag racing junkie Va.
Re: How to fool the knock sensor (NUckINg FuTS)
Modify your search to look back to last summer using KS desensitize , thats where I found out about it. Didn't save the thread it but its pretty easy to do and you can very the amount of sensitivity.
If you don't find it, drop me an email.
Good luck, Dave :thumbs:
If you don't find it, drop me an email.
Good luck, Dave :thumbs:
Racer
Joined: May 2001
Posts: 252
Likes: 0
From: VillaPark,IL U.S.A. IL
Re: How to fool the knock sensor (NUckINg FuTS)
The knock sensor on the 86 is 100k ohms, so if you put a 100k ohm resistor in line to ground the ecm will think that it will never see a knock.
On the 90 and up the knock sensor is 4.3 k ohms.
Chuck MacTrinder :flag
On the 90 and up the knock sensor is 4.3 k ohms.
Chuck MacTrinder :flag
Burning Brakes
Joined: Aug 2000
Posts: 984
Likes: 1
From: Cincinnati OH
Re: How to fool the knock sensor (NUckINg FuTS)
If you want to desensitize the knock sensor (as opposed to completely bypassing it), there's some good info here:
http://www.charm.net/~mchaney/f-tech.htm
http://www.charm.net/~mchaney/f-tech.htm
Racer
Joined: Dec 2002
Posts: 285
Likes: 5
From: Grass Valley, Ca.
Re: How to fool the knock sensor (NUckINg FuTS)
There are two ways to go about this. There was a techtip by 65Z01, James Kovitch on false knock with the 85-89 cars. Accordingly he was told by Gordon Killebrew to replace his stock ECS module with the upgraded GM P/N 16038331. Or you can desensitize the knock sensor by one of two ways. One, wrap teflon tape around the threads of the sensor and screw into the block lightly. Two, the guys running marine applications use a 45 degree or 90 degree elbow to desensitize the sound board the sensor uses to detect knock. Hope this helps
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,019
Likes: 2
From: Na
Re: How to fool the knock sensor (88TripleBlackConvertible)
Hey guys,
I'm not to desensitize it, I want to bypass it completely :yesnod:
Wouldn't this set a code. What I understand is the computer needs a signal at all times. I'm probabley wrong.
I'm not to desensitize it, I want to bypass it completely :yesnod:
Very simple, unplug the sensor completely, disconnect the neagative battery to reset the ecm. Done! No more retarding timing. Dangerous but it works.
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: How to fool the knock sensor (NUckINg FuTS)
I was getting false knock counts on my '84. With 93 octane and initial timing set at 0*, it "knocked" revving it in neutral. I unplugged the sensor wire at the ESC. No more counts, and no light. When I over advance the timing, I can HEAR when it knocks, just like the "good old days", and react, accordingly. Good luck, and...
RACE ON!!!
RACE ON!!!
Melting Slicks
Joined: Mar 2001
Posts: 2,150
Likes: 304
From: Timra, Sweden
Re: How to fool the knock sensor (CFI-EFI)
It will knock before you can hear it. If you disconnect it you might consider building a knock indicator light. It is real simple.
http://forums.corvetteforum.com/zerothread?id=528523
http://forums.corvetteforum.com/zerothread?id=528523
