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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > General H2 Discussion

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  #1  
Old 05-01-2012, 10:21 PM
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Default Knock sensor replacement

Anybody done this?
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  #2  
Old 05-02-2012, 12:12 AM
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Default Re: Knock sensor replacement

Yup, here is a post on it, hope it helps.

http://www.elcovaforums.com/forums/s...ad.php?t=37498
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  #3  
Old 05-02-2012, 02:36 AM
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Default Re: Knock sensor replacement

I have replaced mine twice because i like playing in the local ponds. Its not a tuff job but can seem like alot of work when you think about their location. If you want I can give you some directions and pics let me know good luck.
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  #4  
Old 05-02-2012, 09:12 PM
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Default Re: Knock sensor replacement

Quote:
Originally Posted by HMH2SUT
I have replaced mine twice because i like playing in the local ponds. Its not a tuff job but can seem like alot of work when you think about their location. If you want I can give you some directions and pics let me know good luck.

Quite a bit to take off huh?
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Old 05-02-2012, 11:28 PM
HMH2SUT HMH2SUT is offline
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Default Re: Knock sensor replacement

yeah there's a bit to take off but nothing to hard. They are located under the intake so it has to come off. If you are going to tackle this job make sure you buy a new wiring harness from the dealer and replace this at the same time. And just my advice don't buy the new knock sensors from a local chain parts store get the dealer replacements. I believe my harness was $40ish and the sensors $80-$90ish a piece. Also pick up a new intake manifold gasket. you maybe able to reuse yours without issue but trust me you wont wanna take it back apart to fix a leaky intake.

this is where the 2 sensors are located.


mine where filled with water both time i replaced them





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  #6  
Old 05-02-2012, 11:48 PM
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Default Re: Knock sensor replacement

well ive managed to get it apart. pretty sure i know where everything else goes to put it back except one wire. in the middle of the intake. looks like a spark plug wire kind of.

Last edited by ryaleon : 05-03-2012 at 12:07 AM.
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Old 05-02-2012, 11:48 PM
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Default Re: Knock sensor replacement

you got the part numbers for the harness and gasket? how do you release the harness on the senors?

Last edited by ryaleon : 05-03-2012 at 12:09 AM.
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Old 05-03-2012, 01:06 AM
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Default Re: Knock sensor replacement

Also remove the foam from the back of the intake this will allow water to exit out the back side and build a half moon dam with silicone on the front side of the knock sensor seals so water entering the intake valley from the front side will go around the dam and exit the back. This will keep water from pooling in the sensor holes
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Old 05-03-2012, 01:10 AM
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Default Re: Knock sensor replacement

to release the connector squeeze together on the wide side of the connector, i usually use needle nose pliers cause they can be tough.
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Old 05-03-2012, 01:12 AM
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Default Re: Knock sensor replacement

anybody know where that center connector goes?
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  #11  
Old 05-03-2012, 01:13 AM
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Default Re: Knock sensor replacement

Can you take a picture
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Old 05-03-2012, 01:15 AM
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Default Re: Knock sensor replacement

on its way
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  #13  
Old 05-03-2012, 01:19 AM
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Default Re: Knock sensor replacement

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  #14  
Old 05-03-2012, 01:20 AM
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Default Re: Knock sensor replacement

PCV pipe, goes to left rear valve cover
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Old 05-03-2012, 01:28 AM
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Default Re: Knock sensor replacement

Anymore questions before i log off?
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Old 05-03-2012, 01:32 AM
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Default Re: Knock sensor replacement

Intake bolt torque is important so you dont end up with vacuum leaks, first tighten in sequence from the middle working out to 44 inch lbs. Then a second pass to 89 inch lbs. Then double check at 89 inch lbs
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Old 05-03-2012, 01:33 AM
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Default Re: Knock sensor replacement

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  #18  
Old 05-03-2012, 10:43 PM
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Default Re: Knock sensor replacement

Thank you all for the help. I believer Ive done it all correctly. so far so good.
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