How to Replace Knock Sensors On Chevrolet Silverado?

Knock sensors play a vital role in a vehicle’s engine functionality. It detects any kind of engine noises that are being caused by premature detonation and alters the combustion timing correspondingly.

When a knock breaks down, the ignition is not properly synchronized and severe engine damage might take place there. And this will lead to some expensive repairments. And this sort of problem happens with Chevy Silverado very often.  Although you can get discounted or even free service from the Chevrolet Service Camp.

But the event only takes place once a year for mostly a week. So, if you want to save money, you need to learn how to replace knock sensors in Chevy Silverado.

And if you don’t know how to replace the knock sensor Chevy Silverado, just follow us.

How the Knock Sensors operate

A knock sensor is a sensor device that can identify the high-frequency engine quivering of knocking and emits a wireless signal to the Engine Control Unit, also known as the ECU for short.

The target of a knock sensor is to gain the maximum limit of energy capitulation by starting the detonation as soon as possible. If your vehicle’s engine has a knock sensor, then you can reduce the consumption rate of fuel and increase the torque.

Symptoms that say you have  a Bad Knock Sensor

As you’ve known that a faulty knock sensor can cause an engine to fail and damage the engine severely. A good driver should know how to identify a bad knock sensor.

Checking ETC light

There should be an Electronic Throttle Control light installed in your Chevy Silverado’s dashboard where you can check the light to see if something is wrong with your engine or not.

Loud Thumping Noises

If you hear some thoroughly loud noises from the engine without any reason, then you might consider that you have a faulty knock sensor. It’s easy to identify because if the ignition has occurred early on the engine, your knock sensors will fail and it will make those loud thumping noises.

Engine Misfiring

An engine misfire can occur for various reasons. But the most usual reason out of every one of them is interruption of the airflow in the combustion chamber. And the interruption can occur when you have a faulty knock sensor.

And there’s also engine shaking, vibration, and other symptoms which will help you to recognize whether you have a bad knock sensor or not.

Ways to replace 2006 Chevy Silverado Knock Sensor

You might be wondering why we’ve chosen the 2006 Chevy Silverado here. Well, it’s because the Chevy Silverado 2006 was the most controversial Chevy Silverado model ever. There were problems with the emergency brake, bad paint, a faulty engine, and many other problems. 

So, it’s common to have a faulty knock sensor in your 2006 Chevy Silverado and we know that you need to replace knock sensor 2006 Silverado. Let’s see how you can do that.

Accessing the Intake Manifold

For starters, you have to disconnect the negative battery console when you are working under the car’s hood. The next thing you’ll be doing is removing the intake channel. After that, start removing the throttle plug and cruise control plug from the body. 

Now, remove the throttle channel bracket from the manifold and push that throttle channel bracket along with the plugs. Then, you have to remove the bolts that are holding the main engine on the vehicle’s driver’s side. You have to unplug a total of three parts now, the MAP sensor, the EVAP solenoid, and the knock sensor’s sub harness.

Then, remove the throttle body as you’ve unplugged and unbolted all the necessary parts. Start removing the vent channels from the valve cover. Following all these steps will lead you to an exposed intake manifold.

Removing the fuel lines

You can use a fuel line remover to easily remove fuel lines that would interrupt the lines connecting with the rails. Now, use a rag to catch any leaking gas. Use the same fuel line remover to remove the EVAP line that connects the engine and the firewall.

Removing the injectors and the engine wire harness

First, you need to unplug all of the eight fuel injectors and the fuel connectors. Once you’ve done that, disengage the vacuum line from the brake’s booster. Now, pull off the engine gear to the side and disconnect the alternator adapter. Then, disconnect the IACV (Idle Air Control Valve).

Now that you’ve successfully removed all of the injectors and connectors, you can finally replace the knock sensor.

Replacing the Knock Sensors

You need to loosen up all of the intake manifold bolts in the obverse order to their actual sequence of bolting down which is 10 to 1. Then, pull off the intake manifold. 

The knock sensors are situated under the black channels affixed with a wire gear. Pull out the plugs and loosen up the bolts of both of the knock sensors while using a 22mm cavernous socket.

Lodge the new knock sensors and torque the sensors to 15 ft-lbs. Then, apply RTV to the rubber channels to prevent water from plunging in.

Mount all of the removed parts

Now is the time to re-install all of the components you’ve taken out. Let’s start with clipping the new intake manifold coverings to the intake manifold. Remember to clean all of them.

Try to set the removed manifold back to the engine and torque the unbolted bolts in the correct order which was 1 to 10.

Now, place the throttle body back to its original place and torque it.

Engage the knock sensor channels from the wire gear and plug all of the remaining sensors in.

Re-engage the fuel lines and the EVAP line which you removed earlier with a fuel line remover. Finally, connect the negative battery console back to its place and you’re good to go.


Look, we know that we’ve bored you until now, but bear with us a little more. Normally replacing a knock sensor from your Chevy Silverado would cost you around 250 US dollars to 300 US dollars if you go to a repair shop.

Whereas if you fix the knock sensors of your Chevy Silverado on your own, you can save that money, right? So, all the best to replace the knocks sensors if you are doing it for the first time.

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