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Anyone ever replace knock sensor?

1937 Views 10 Replies 5 Participants Last post by  Ma v e n
I've replaced it twice and neither sensor brand new is ohm'ing out. Both bought from different places. Is there a good place to get these sensors?
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What does your manual say the resistance spec is supposed to be? Anyway you could post a pic or a screen shot? I don't use ohms to diagnose the sensors, and can't find in the service manual any reference to do so. they generate AC frequency. You should be checking them using a meter deter to AC Volts/Frequency. The Hertz output should fluctuate when you lightly tap on them
 

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2014 LT program car, Pull Me Over Red, 1.4T Auto
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What does your manual say the resistance spec is supposed to be? Anyway you could post a pic or a screen shot? I don't use ohms to diagnose the sensors, and can't find in the service manual any reference to do so. they generate AC frequency. You should be checking them using a meter deter to AC Volts/Frequency. The Hertz output should fluctuate when you lightly tap on them

I gotta ask. What's a meter deter? :respect:
 

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2014 LT program car, Pull Me Over Red, 1.4T Auto
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I've replaced it twice and neither sensor brand new is ohm'ing out. Both bought from different places. Is there a good place to get these sensors?
I know they are about $10 more, but I bought mine from a GM Dealer.
 

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Well, I just replaced mine and I got no reading on a megaohm scale. The knock sensors I’m used to getting between 500 kiloohms to 1 megaohm, but get no reading from these sensors. Haven’t figured out why yet. It’s not my equipment, I have a top of the line ideal and fluke meter (am electrician), so dont know.


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Well, I just replaced mine and I got no reading on a megaohm scale. The knock sensors I’m used to getting between 500 kiloohms to 1 megaohm, but get no reading from these sensors. Haven’t figured out why yet. It’s not my equipment, I have a top of the line ideal and fluke meter (am electrician), so dont know.


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They won't display a resistance, even on a 50M ohm meter(I use a Fluke 28ii) I've never tried testing them with my 1587 because I've got no interest in frying a known good sensor, and the info would be of no additional useful significance.

Put the meter on AC voltage and tap on the sensor. You should see over 100millivolts AC.
 
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