Question about 2005 Chevrolet TrailBlazer LT
Need to location of knock sensor for removal and replacement
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Posted on Jan 02, 2017
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
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
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
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.
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Posted on Jul 30, 2010
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