Question about 2005 Chevrolet TrailBlazer LT

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4.2 liter knock sensor

Need to location of knock sensor for removal and replacement

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: Where is the location of the knock sensor for a 2005 HD 2500 6.0

HAS TWO KNOCK SENSORS they are both under intake in valley of engine. remove intake and will see two black grommets they are under those best to replace both at same time

Posted on Jan 26, 2009

  • 1 Answer

SOURCE: knock sensor location on 2001 chev 1500 4x4 5.3 eng

they are located under the intake manifold, it takes two. they sit in a pint size cup hole. they tend to rust from engine WASH.

Posted on Jul 27, 2009

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SOURCE: I have a 1989 Chevy Van, G20 with a 5.7 liter


Posted on Nov 08, 2009

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SOURCE: knock sensor location

The knock Sensors are located under the Intake Manifold at the top of your engine. The top will have to be taken off along with the intake manifold. Knock Sensors in past silverados used to have a problem with leaking water that corroded the sensors from washing the engine. Most times when you go to replace the knock sensor you will have to replace both along with the wiring harness that includes the the gaskets the knock sensors are surrounded by. After that you have to check the resistance to make sure you dont have any problems and then reinstall all parts along with a new intake manifold gasket. A good mechanic can do this for you in a day and charge you around $400. If you try to go to some place like a chevy dealer you will pay over $800. This is from experience of just replacing mine 2 weeks ago.

Posted on Mar 10, 2010

  • 270 Answers

SOURCE: how to replace the knock sensor on a 2004

Hello Friend:

Your Anti-Knock Sensor is Located With Hood Raised Facing the Engine Compartment,Its on the LEFT SIDE Right Under your Exhaust Manifold Towards the Back.

On the Engine Block ,You'll see Your Anti-Knock Sensor Wires running to it.

Its a Little hard to Get to but Not so hard that you can't do it Yourself.

Disconnect the Wire Connector, And Take a Good Look at the Wires,Since it Runs so Close to your Exhaust you could have Also some Faulty Wiring going to the Sensor.

Just Un Screw the Anti-Knock Senser and Replace New.

This will get your Anti-Knock Sensor Replaced With A New One Like i Said Look very Good at the Wiring Going to the Sensor.

Thanks for using FIXYA Please let me know how i've helped you by Voting and If you Would write a Small Testamony.

Thank You: From d_hubbs

Posted on Jul 30, 2010

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I recommend that you let the vehicle cool down before beginning this process. To remove this you will need a drip pan, as coolant will leak from the engine when the sensor is removed. You will need a deep well 22mm socket and torque wrench.

1. Jack up and support the vehicle on jack stands so that you can work from underneath the vehicle. Be sure to apply your emergency brake.
2. Identify the knock sensor location and remove the electrical connector on the bottom.
3. Using the deep well socket, remove the sensor from the block. Do not position yourself direcly underneath this, as coolant will begin to flow immediately from the sensor's location.
4. Your new knock sensor should come pre-coated with sealant/threadlock, just install it and tighten by hand until snug.
5. Torque the sensor to 14 ft lbs.
6. Replace the electrical connector.
7. You should flush the entire coolant system to be sure to remove any air pockets, and then refill.

Hope this helps and thanks for using FixYa!

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Where is the location of the knock sensor for a 2005 HD 2500 6.0

HAS TWO KNOCK SENSORS they are both under intake in valley of engine. remove intake and will see two black grommets they are under those best to replace both at same time

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Knock sensor location

Knock Sensor Description addthis_pub = 'car-suff'; button1-bm.gif parts-box-top-lft.gif parts-box-top-rt.gif knock-sensor.jpg parts-box-rt.gif parts-box-btm-lft.gif parts-box-btm-rt.gif A quality Knock Sensor is more important than ever thanks to today’s increasing gas prices. Your Engine Knock Sensor enables your vehicle to obtain the optimum combination of timing and fuel/air mixture to generate power and efficiency and that means less wasted gas. Our guaranteed low prices make us your one-stop Knock Sensor Location. Regardless of the brand, make or model car, truck, van or SUV you drive, we make it easy to locate the application specific Knock Sensor that’s perfect for your vehicle. Our state of the art parts locating system puts you just a few mouse clicks away from the Knock Sensor you need and at a price you cannot beat anywhere. Click. Click. Click. And you are there. In addition to robbing you of fuel economy and performance a faulty Knock Sensor can cause expensive damage to your engine. Remember, the Knock Sensor keeps fuel from detonating in the cylinder … exploding rather than quickly burning as it should. If not replaced a faulty Knock Sensor can quite literally cause hundreds if not thousands of dollars in damage. There is really no need to look any further to find the Knock Sensor that’s application specific for your car, truck, van or SUV – high performance or family vehicle. We’ve got guaranteed low prices and shipping that other suppliers envy. Give us a try, we think you’ll be happy … in fact we guarantee it.

Jun 20, 2008 | 2003 Hyundai Santa Fe

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