Knock Sensor Quick-Fix

SOFTWARE CATALOG:

Knock Sensor Quick-Fix

The knock sensor is used by the ECM to fine tune ignition timing. A faulty knock sensor will cause a faulty code to set, and may also cause ignition timing to be skewed. Lack of power may also be another symptom. These are the knock sensor facts.

1) The knock sensor is a type of microphone, screwed to the engine block or manifold.
2) It is a piezo electric or crystal component.
3) Knock sensors produce their own electricity.
4) A knock sensor produces alternating or AC current.
5) The sensor is tuned to between 6 to 9 thousand Hertz, which is the pinging frequency, so as not to confuse the ECM.
6) There are two types of knock sensors, the older wide band, and the newer resonant or tuned knock sensor.
7) You test these two types of sensors differently.
8) To test the wide band knock sensor, with engine and key off, probe with a volt meter set to AC, between battery ground and the knock sensor signal wire. Then, light tap near the knock sensor using an extension or back of the ratchet wrench.
9) The resonant newer style knock sensor will not react to engine tap. These sensors are tuned only to an engine ping.
10) To test these sensors, connect the volt meter as before, start the engine, then remove the fuel pump relay or fuse. As the vehicle is starved for fuel, pre-load the engine a bit by putting the car in gear, foot on brake, and accelerate a bit. The fuel starved engine will ping.

On both tests you should see an AC voltage outputted. That concludes the knock sensor Quick-Fix.

[briansmobile]

Mandy- you are so smart and do such a great service/job with these videos.  I just want to say how much I appreciate the work that you do.  And thank you for the efforts you make to bridge the "mystical" automotive technology gap for technicians and DIY'ers the world over.  You are a powerhouse of wisdom and innovation!

[spelunkerd]

I like how you listed the facts about this little device. These videos are very helpful.

[sivucit]

very good, I cant believe this quick fix are so simple and very handy. your ideas are always worth and good thing is you teach both conventional method with and without scanner. keep it up

[azimmey]

How is this a quick fix? It fixes nothing. It just tells you how to diagnose.

[MegaCakebake]

These videos are great learning tools. Thanks for taking the time to make and post them.

[MrJcardimen]

Great explanation. Very concise and easy to grasp.

[nikolozkvrivishvili]

Very comprehensive directives on how to test KS! Thank you.

[skrimshaw]

Glad this video is still here, very helpful. Thanks

[paulwright]

Excellent presentation! Very clear and concise. Just the facts.

[BlueRidgeMarine]

Hi ADP. Coming over from Brians mobile show. Going to sub you and look forward to visiting your past and future videos. Thanks for taking the time and all the work it requires to make a video. Thumbing-up!

[t]

Clear and easy to understand, very good information. Please keep making videos!

[corystansbury]

Another new sub from Brian. Great videos. Keep up the good work.

[JOEHILLS]

This video does not say how to fix a knock sensor, but how to test one. Unless I missed something while watching. I guess I'm just going to replace my knock sensors with new ones.

[magnit]

You've got your types of sensors mixed up. The older ones are the resonant ones that output a high voltage at a single frequency when hit. They're usually 8 to 12 KHz. depending on the engine. The newer ones are the wideband ones which are just like a normal microphone.

[christopherdeleon]

awesome video short simple and full of info! I'm a subscriber now

[forgotmylogininfo]

Thanks for the explanation. Great video

[AussBosss]

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The ingredients are:
- Pineapple
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This was how to make a pineapple upside down cake. Thanks for watching. Please like and subscribe. That’s how useful this video is. Unreal.

[drwombat]

How am I supposed to test a resonant knock sensor in an 04 silverado truck when the intake has to be removed to get to the knock sensors? I understand many vehicles such as toyotas also have their sensors in the intake valley. My truck will not start without connection to the air filter box, much less while removing intake/throttlebody/etc.

[MrStickyIggy]

are you spanish? your english is excellent!!

[Malomex]

If I had a bad knock sensor would it give me a fault code of P0022? I recently took my truck (06 F250 5.4) to the shop and they changed my VCT solenoids on bank 1 & 2. I'm still getting the code P0022. Any help would greatly be appreciated...