knock sensor question.

skife · 12-29-2007, 02:19 AM

i don't have a knock sensor, i was wondering if there was anyway to trick the computer into thinking i did.

This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!

Novec64 · 12-29-2007, 04:08 AM

They're cheap and there for a reason. What benefit is there ditching it?

Targetnut · 12-29-2007, 04:29 AM

If your vehicle is supposed to have a knock sensor then it would be more difficult to trick it than to just put one on.

The knock sensor has a piezo electric element that gives off an A/C voltage signal proportional to the vibration it recieves. it is tuned harmonically to the frequency of detonation ( about 7.1Khz) and at that frequency the amplitude of the signal increases tremendously. so if you where to build a A/C frequency transmitter and dial it in to the proper amplitude and frequency that would probably do the trick.

But like I said before, it would be a lot easier to just replace it.

shaeff · 12-29-2007, 10:05 AM

aside from the fact that it could save your motor in the event of a bad batch of gasoline, sticking injector, or dying fuel pump. (especially in turbocharged applications)

skife · 12-29-2007, 10:14 AM

Quote:

Originally Posted by Novec64

They're cheap and there for a reason. What benefit is there ditching it?

block is from 1984, there is no spot for a knock sensor.

Thank you guys for the answer i needed. i'll have to figure out a way to mount the thing now.

SEAIRESCUE · 12-29-2007, 10:16 AM

I purchased a used one off Ebay. Worked like a champ. I drove my truck for awhile without one and it ran fine but turned on the CEL ever time I would drive off.

Now go get one and protect your motor. Ever seen a piston with a hole through it caused by detonation? I have. Failed right in the center where the little dimple is located. Detonation can also beat the he!! out of your top rings.

yota4runna · 12-29-2007, 10:38 AM

I'd think you could braze a nut with the proper thread onto the engine.

dcg9381 · 12-29-2007, 11:00 AM

You can locate it here as indicated:
http://www.lcengineering.com/TechNotes/TechNote21.htm

Note, There at least 2 different KS designs - make sure you match thread and KS design to your ECU.

skife · 12-29-2007, 12:07 PM

Quote:

Originally Posted by dcg9381

You can locate it here as indicated:
http://www.lcengineering.com/TechNotes/TechNote21.htm

Note, There at least 2 different KS designs - make sure you match thread and KS design to your ECU.

alright, thanks, i've got the tap for it already too, i'll be doing this tomorrow.

12-29-2007, 04:29 AM	#3 (permalink)
Targetnut Registered User Join Date: Jul 2005 Location: Manassas, VA Posts: 554	If your vehicle is supposed to have a knock sensor then it would be more difficult to trick it than to just put one on. The knock sensor has a piezo electric element that gives off an A/C voltage signal proportional to the vibration it recieves. it is tuned harmonically to the frequency of detonation ( about 7.1Khz) and at that frequency the amplitude of the signal increases tremendously. so if you where to build a A/C frequency transmitter and dial it in to the proper amplitude and frequency that would probably do the trick. But like I said before, it would be a lot easier to just replace it. __________________ Targetnut don't talk about it, just do it! Precision Import Service '93 2WD 22RE, Ported w/os valves, custom intake manifold, crane cam,Megasquirt, 295cc injctrs, Supra fuel pump, adj fuel pres reg, 70mm throttle, LCE header, V6 Taco cat, 14lb flywheel, Kevlar clutch, W58 and short shifter, 4.10 gears w/Truetrac, drop spindles and blocks, 245/50-16 Yokos on 16x8 wheels, 4WD fenders, bumper, and valence, skinned tailgate

12-29-2007, 10:05 AM	#4 (permalink)
shaeff Registered User Join Date: Dec 2006 Location: near Kingston, NY Posts: 301	aside from the fact that it could save your motor in the event of a bad batch of gasoline, sticking injector, or dying fuel pump. (especially in turbocharged applications) __________________ My heatercore replacement writeup with pics. -'94 Toyota 4X4, 22re, 31X10.5 BFG M/T's, 5 speed, MC rear bumper. (Winter DD/ off road fun) -'95 BMW M3, modded/suspension, sticky rubber, back road monster (Summer DD) -86.5 Toyota Supra, too much to list. (Never-ending project)

12-29-2007, 11:00 AM	#8 (permalink)
dcg9381 Registered User Join Date: Jun 2006 Location: austin, tx Posts: 1,825	You can locate it here as indicated: http://www.lcengineering.com/TechNotes/TechNote21.htm Note, There at least 2 different KS designs - make sure you match thread and KS design to your ECU. __________________ http://www.22REturbo.net

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
22re Knock sensor vs 3.0 knock sensor	tlake	86-95 Trucks & 4Runners	4	01-30-2008 09:53 AM
Knock sensor?	cmckeon	86-95 Trucks & 4Runners	1	01-21-2007 09:20 PM
knock sensor question	xentrino	86-95 Trucks & 4Runners	3	09-23-2006 01:38 PM
need a knock sensor	ohioyotaguy	95.5-2004 Tacomas & 96-2002 4Runners	22	01-31-2005 01:04 PM
Knock sensor again	Bassinfool	95.5-2004 Tacomas & 96-2002 4Runners	3	01-15-2005 11:28 AM

12-29-2007, 04:08 AM	#2 (permalink)
Novec64 Registered User Join Date: Nov 2007 Location: Central PA Posts: 9	They're cheap and there for a reason. What benefit is there ditching it?

12-29-2007, 10:16 AM	#6 (permalink)
SEAIRESCUE Registered User Join Date: Apr 2007 Posts: 491	I purchased a used one off Ebay. Worked like a champ. I drove my truck for awhile without one and it ran fine but turned on the CEL ever time I would drive off. Now go get one and protect your motor. Ever seen a piston with a hole through it caused by detonation? I have. Failed right in the center where the little dimple is located. Detonation can also beat the he!! out of your top rings.

12-29-2007, 10:38 AM	#7 (permalink)
yota4runna Registered User Join Date: Oct 2007 Location: Southern Ore. Posts: 327	I'd think you could braze a nut with the proper thread onto the engine.