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Old 01-24-2007, 02:14 PM   #1 (permalink)
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How to tell if knock sensor is bad?

Anyone know how to tell the knock sensor is bad? I drove around for a couple weeks w/o it while the wire was broken, so I doubt the ECU even noticed it wasn't there. now that I fixed the wire and put a new end on it, i'm leary that its not working, the previous person tightend it on there so tight that it cracked the plastic housing. Anyone have any insightful insight?
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Old 01-24-2007, 03:59 PM   #2 (permalink)
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i really don't think that if the person tightened it on there that tight that that could of done any good...
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Old 01-24-2007, 09:36 PM   #3 (permalink)
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Hi dude,
Havent talk to you in a long while Ryan.. Whats up??

I have been told by several people that whenever the knock sensor goes out, it will throw a code. I dont beleive that though..

I think you can get all of the symtoms a bad sensor if its just starting to go bad (green stuff fouling on the back of the donut). But, if it is cracked, screwed tight and the metal on the block side is intact, it could still be good..

But, check this thread: http://www.sr20forum.com/sr20de-technical-corner/183887-knock-sensor%3Dno-codes.html
and this one: http://www.sr20forum.com/general-sr20/152493-dogging-full-throttle-new-jdm-swap-pro-advice-5.html
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Last edited by DC Scotty; 01-24-2007 at 10:10 PM.
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Old 01-25-2007, 01:29 AM   #4 (permalink)
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Quote:
Originally Posted by DC Scotty View Post
Hi dude,
Havent talk to you in a long while Ryan.. Whats up??

I have been told by several people that whenever the knock sensor goes out, it will throw a code. I dont beleive that though..

I think you can get all of the symtoms a bad sensor if its just starting to go bad (green stuff fouling on the back of the donut). But, if it is cracked, screwed tight and the metal on the block side is intact, it could still be good..

But, check this thread: http://www.sr20forum.com/sr20de-technical-corner/183887-knock-sensor%3Dno-codes.html
and this one: http://www.sr20forum.com/general-sr20/152493-dogging-full-throttle-new-jdm-swap-pro-advice-5.html
Not much goin on, my NX is slowly coming along. I got the new tranny, new motor mounts, tune up, got rid of a bunch of crap in my engine bay, and am in the process of much more. I haven't gotten the HVAC controls installed yet though!! I need to, it should be done here soon. The car was such a pile when I got it, theres LOTS of stuff to do to it. Hows your ride doing?
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Old 01-25-2007, 03:17 AM   #5 (permalink)
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never looked at one on a b13 but if its a 2 wire sensor just take it out and hook up an volt meter to it and tap. if it sends voltage then whamo your good.
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Old 01-26-2007, 11:07 AM   #6 (permalink)
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My egg is just doing so-so. You get everything installed and then something else happens. I thought I would be done by xmas with the SSAC header as the last bolton for the car. It has required me to change the O2, by a narrower rad fan, and fool around with the emission stuff. And now I have a tick..tick...tick...

But its all good. Im getting through it just fine. Just being patient.

Test the Knock sensor using the volt meter. If its not up to par, get another one. I have found them at the local junk yards and most were measuring peak. Will save you about $150 if you find one there...
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Old 01-28-2007, 02:25 AM   #7 (permalink)
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voltmeter...nothing new by now.

just for a little insigt...it wont throw a code if the knock sensor goes out, cause the ecu isnt sending voltage to the sensor, the sensor is sending voltage to the ecu (a pizeo electric crystal inside the knock sensor produces a voltage when its squeezed or tapped). the olny way to get a knock code is an actual knock of the engine, or a wiring problem.

good luck!
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