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Replace knock sensor and what gaskets are needed

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Is it supercharged or not.Either way you will have to remove the intake manifold as it is in the "valley" between the two cylinder heads.

Posted on Aug 01, 2009

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1 Answer

2005 suburban 5.3 engine where are knock sensors located and how do you replace them


two knock sensors.under phlemm assy. replace cover gasket, two sensors and wire harness.

Jan 27, 2013 | 2005 Chevrolet Suburban

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Where is the knock sensor located?


the knock sensors (there are 2) are located under the intake manifold, u must remove the intake maniofold to replace them, also u will need the new stub wiring harness most likely to each sensor and a set of intake gaskets

Feb 04, 2010 | 2002 Nissan Quest

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Steps to replace a knock Sensors?


I had to do this last summer. First I went to Advanced Auto. They
read the code for me. One of them was bad, but I went ahead and
replaced both. I purchased a manual for the steps, two knock sensors
and a gasket set. About 170 dollars total. You will also need a torq
wrench in inch pounds. Take your time, keep it clean. Make sure
you clean the manifold and engine head surfaces where the gasket
seats. Use a non metallic scraper, and if need be solvent to loosen
any old gasket material. I found that laying saturated rags on the
head surface and leaving them set a few hours helped the most.
You can also get the steps and torque specs from either Advance
auto or Auto Zone(then you don't need the manual).
Use patience when tightening the manifold bolts, you should
torque them in the sequence given(in the manual or online) and
you have to do it twice, first time at half torque, then the second at
full torque. If you over tighten you can crack the manifold.
Good luck
Art LeDoux, Stillman Valley Illinois

Dec 24, 2009 | 2001 Chevrolet Suburban

1 Answer

In changing the knock sensors on 2000 suburban ,


If you have a 5.3 or a 6.0L engine the knock sensors ( 2 ) are under the intake manifold. You will need a set of intake manifold gaskets.

Jul 27, 2009 | 2000 Chevrolet 2500

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Head gasket


sometimes when you reassemble heads the knock sensors will set a code. it best to replace both sensors and short harness while your there. they set in the valley of engine block.

Feb 15, 2009 | 1994 Lexus Es 300

4 Answers

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.

Dec 23, 2008 | 2004 Chevrolet Silverado

1 Answer

XJ8 Knock Sensor


Pretty Difficult you have to remove the complete intake and injector rail. You will need both side intake gaskets and the plenum gasket.

Dec 12, 2008 | 2001 Jaguar XJ8

1 Answer

Have a 1999 lexus es300. Getting indications that knock sensors need to be replaced. Car has 144k miles. What do the knock sensors do and how easy / tough to replace?


If you have some common tools the knock sensors are no big deal.  If you take a lexus they will make is sound like you need to completely disassemble the engine and scare you off.
First, do you really have a problem with preignition causing real knocking due to carbon buildup, or diluted gasoline or do you have failed knock sensor(s).  Try to decarbon the engine first.
There is a technique used with water being sprayed into a warm engine intake.  This will clean up the valves and carbon buildup which can result in engine knocking.  

The job will be a couple hundred for the parts and a couple hours of your time.  After you are done, you have entitled yourself to approximately $500 in new tools for your tool chest since this is what Toyota and Lexus will charge to fix (about $1k+).

You will need to buy the following to address the knock sensors and a couple other items while you're in the neighborhood.
- 1x upper intake plenum gaskets - 2x lower intake plenum gasket - coolant bypass hose found in the same area as knock sensors - 2x knock sensors (bank1 and bank2) - short pig tail cable which connects both knock sensors to common wire harness. - toyota antifreeze  (2 gallons, if i remember correctly... when mixed to 50/50 (antifreeze/ water) you will have 4 gallons.
drain the radiator drain the front of the engine using the engine drain plug - this plug is on the front right side facing the engine, behind the right hand exhaust manifold. (this will lower antifreeze enough to avoid dumping antifreeze all over the engine later) remove the air filter box remove the connections into the throttle body remove the cable from the throttle control remove the upper air intake plenum remove the two lower air intake plenums remove the antifreeze fill port
Knock sensors will be in the valley between the lower intake plenums.  You will need to remove the rubber antifreeze bypass hose (little short hose blocking access to the knock sensors).
By the way, the reason you bought a replacement, is that if this short hose splits from normal wear, you need to spend this money and effort to reach it, so just do it now.
The little pig tail cable which connects both knock sensors to the wire harness is said to cause a big majority of the problem due to the plastic getting hot and brittle, falling off and shorting to the engine.  While in this mode the engine thinks knock is occuring and starts to retune the air fuel mixture to get rid of the knock until it goes into minimal operations mode.
After replacing the knock sensors (and tighten to torque specs), replacing pig tail cable, and reinstalling your new short by pass hose.  Replace the lower gaskets, antifreeze fill port, lower intakes, upper gasket, upper intake, air intake, air filter, reattach everything, reconnect all the rubber lines you pulled off, make sure there are no splits in the air intake passage anywhere, retighten the engine antifreeze drain plug, and the drain on the bottom of your radiator, and your done!
Don't forget the easy stuff.  Dilute the antifreeze with water and fill the radiator and overflow tub.  Run the engine for several minutes until its hot and opens the thermistat to allow antifreeze into the empty engine cavities.  Turn the engine off and get a cold one as the engine cools.  Once absolutely sure engine is cold, refill the radiator with antifreeze and refill the reserve tub.  Do this at until all the beer is gone and you are both full of antifreeze (in one form or another)..... obviously red stuff in the car, amber down the gut.

Jul 27, 2008 | 1998 Lexus ES 300

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