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Knock Sensor replacement

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Knock Sensor replacement

Postby Nickfish22 [OP] » May 30 2012, 5:02am

So I've had my 2004 silverado for about a year now. The check engine light came on and went away for the past few months for a knock sensor, I've been ignoring it but now it's pretty constant so I'm assuming it finally went bad. (Check engine light would come on after I went through a large puddle or something )

Anyways, I was hoping to change it myself, and have been looking around on the internet for a "How-to" with pictures or something but could not find anything. Orileys has an aftermarket knock sensor for half the price of the dealership and I was going to go with those ones but some people say the trucks computer will not recognize the after market sensor.

Long story short I was hoping to get some help on how to change this sensor or if I should just bring it to a real mechanic. I have two roommates and a neighbor that are fairly good with vehicle maintenance and they will be helping me, but I like to get opinions before I start tearing into my truck.
Thanks!
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Knock Sensor replacement

Postby Machster69 » May 30 2012, 2:29pm

I cant attest to which sensors to buy, its a kinda involved job so i wouldnt buy the cheap ones. Wouldnt wanna do it again...

That said... Its a piece of cake bud, but theres some things u might change along the way. The sensors sit under the intake, so that'll have to come off, so i recommend changing that gasket(not with the cheap one lol). You'll need a fuel disconnect tool while your at the parts store. And youll need an inch pounds torque wrench....

Intake removal
http://www.youtube.com/watch?v=HAqkVW0T ... ata_player

Sensor how to
http://www.youtube.com/watch?v=IX1xDA3p ... re=related

You could always buy a shop manual (Haynes etc..) for the truck that will help you too... its about time you invest in one bc that 04 is gonna start needing lil fixes here and there
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Re: Knock Sensor replacement

Postby Nickfish22 [OP] » May 31 2012, 3:53am

Thank you very much this will help tremendously.
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Re: Knock Sensor replacement

Postby SilverSurfer » May 31 2012, 4:00am

This is a known issue, the rear knock sensor will take on water usually from hosing down the engine. Make sure you rtv the new sensor when you put it in. I haven't checked video, that may all be in there.

Good luck.
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Re: Knock Sensor replacement

Postby Nickfish22 [OP] » May 31 2012, 4:03am

What do you mean by "RTV" the new sensor?
Also I'm still kind of stuck on OEM versus aftermarket. the OEM are almost 100 dollars each where Orileys has it for 49$. The person said with the truck being almost 10 years old it should be fine to do an aftermarket sensor but I really don't wanna tear it apart again. Just curious if anyone's worked with this at all.
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Re: Knock Sensor replacement

Postby SilverSurfer » May 31 2012, 4:26am

RTV is a silicone sealant, keeps out water. You'll want high temp rtv.

I can't answer to oem vs a/m, sorry.
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Re: Knock Sensor replacement

Postby Rebel842001 » May 31 2012, 6:46am

The aftermarkets should be fine. I got mine from a napa store. When you silicone them up all you do is put the silicone on the black.rubber plug that goes in the hole the sensors are mounted in. just saying to make sure you dont think that you have to fill in the entire hole. I always stuffed shop rags into the intake ports on the heads soon as you get the manifold off, being carefull that you dont get any debris in the ports. Then clean up the gasket surfaces on both the heads and the intake. Then put it all back together making sure you have removed all rags just before you set the intake back on. As far as torquing the intake down its not required, the way the bolts are designed they are only going to put so much pressure on the intake. Just use a 3/8 ratchet with a long.extention and socket and dont kill them, just good and tight. Or if you have access to air and air tools, a 1/4 drive air ratchet works great it wont over tighten them any. Ive done quite a few if these working at the dealer, i was doing them in under an hour after the first set or two.
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Re: Knock Sensor replacement

Postby Rebel842001 » May 31 2012, 6:58am

Also be sure to relieve the fuel pressure off the rail before disconnecting the fuel line or you will end up with gas in your face. Just pull the relay for the fuel pump out of the fuse.panel on the drivers side fender and try to start the engine a few times. It might actually start the first time but it shoud die within a sec or two. When you are ready to start the engine after your done reinstall said relay and only cycle the key to the on position and not all the way to start. Doing this 3 or 4 times will repressurize the fuel rail and then you can start the engine
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Knock Sensor replacement

Postby Machster69 » May 31 2012, 11:31am

And stop spraying water under there!
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Re: Knock Sensor replacement

Postby riot983 » Jun 09 2012, 3:24am

Great Video Links!!!! Thank you very much!
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