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HOW TO: Replace knock sensors on a GMT800/GEN III V8

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Old 12-07-2010, 09:35 PM
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Originally Posted by budhayes3
Nice, sounds like you sent Santa your list already My truck's a tidbit too filthy for pics at the moment, but I haven't put the winter wheels on it yet...so it's not out of the question...maybe some snow shots!
That's what I was thinking, with the truck being black and all.
Old 12-08-2010, 07:57 AM
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you might want to add . . .

To bleed off the fuel pressure, start the truck, remove the fuel pump relay, let the truck idle and die.
Old 12-09-2010, 08:26 PM
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For the knock sensor sub-harness. Its listed as the knock sensor wire. The part number is 15320925

Last edited by AndysC3; 01-14-2011 at 09:47 AM.
Old 12-14-2010, 09:56 PM
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some of the techs where i work put a bead of rtv in front of the rear knock sensor hole and remove the foam from the rear of the intake to let the water run off the back of the engine better.

here a pic of where they put the bead of rtv
HOW TO: Replace knock sensors on a GMT800/GEN III V8-img_0443.jpg
Old 12-15-2010, 02:46 AM
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I couldn't figure how to get the connection off the knock sensor, so you might want to add that you have to squeeze the connection with a pair of needle nose pliers in a certain place to remove the plugs without breaking them.
Old 11-30-2011, 12:15 AM
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DV2000NJ,
Thanks for the post and all the pictures man just did mine today so the play by play worked. "No engine code", replaced both sensors, harness, gaskets and built my silicone dam.
Old 11-30-2011, 09:17 AM
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I'll be doing this soon...the code just popped up for me
Old 01-11-2012, 09:51 PM
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i was sweating this code until now. great write up!
Old 10-23-2013, 02:57 PM
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Thanks to DV2000NJ for this write up! I know it's more than 2 years old but this is the 1st time I've had to dig into a motor by myself. I know I know most of you guys dig in way deeper than this but for a daily driver for me this is as far as I have gone into a motor.

I've done transmissions, front and rear axles brakes stem to stern on may cars/trucks but when it came to motors I farmed it out.

Thank you again, your pics and step by step helped out tremendously.
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