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05-01-2012, 10:21 PM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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Knock sensor replacement
Anybody done this?
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05-02-2012, 12:12 AM
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Hummer Authority
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Join Date: Oct 2003
Posts: 1,118
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Re: Knock sensor replacement
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05-02-2012, 02:36 AM
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Hummer Veteran
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Join Date: Aug 2009
Posts: 68
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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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2005 SUT Used and Abused, you name Ive broke it!
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05-02-2012, 09:12 PM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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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.
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Quite a bit to take off huh?
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05-02-2012, 11:28 PM
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Hummer Veteran
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Join Date: Aug 2009
Posts: 68
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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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2005 SUT Used and Abused, you name Ive broke it!
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05-02-2012, 11:48 PM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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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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05-02-2012, 11:48 PM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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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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05-03-2012, 01:06 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
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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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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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05-03-2012, 01:10 AM
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Hummer Authority
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Join Date: Sep 2003
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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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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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05-03-2012, 01:12 AM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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Re: Knock sensor replacement
anybody know where that center connector goes?
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05-03-2012, 01:13 AM
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Hummer Authority
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Join Date: Sep 2003
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Re: Knock sensor replacement
Can you take a picture
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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05-03-2012, 01:15 AM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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Re: Knock sensor replacement
on its way
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05-03-2012, 01:19 AM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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Re: Knock sensor replacement
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05-03-2012, 01:20 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Knock sensor replacement
PCV pipe, goes to left rear valve cover
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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05-03-2012, 01:28 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
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Re: Knock sensor replacement
Anymore questions before i log off?
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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05-03-2012, 01:32 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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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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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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05-03-2012, 01:33 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Knock sensor replacement
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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05-03-2012, 10:43 PM
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Hummer Veteran
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Join Date: Mar 2012
Location: West Texas
Posts: 205
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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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