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Knock Sensors

Chris

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Chris Senior Enthusiast

Chris

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i have been throwing a code for about 6 months deployed for 4 of them. i need to change the right side. if both are close ill do both. are they a b*tch to do? i want to know what im getting in to.

redvett Senior Enthusiast

redvett

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Posted

The "LS" engines have two under the plentum, follow the TSB for proper fix. Replace both along with the harness and do the silicone around the sensors.

Chris Senior Enthusiast

Chris

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i have to do the harness too? and TSB?

redvett Senior Enthusiast

redvett

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The harness and the silicone along with the KS replacement is recommended in the TSB and if you want to fix the problem and get your fuel economy back do it.

Chris Senior Enthusiast

Chris

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i noticed fuel econ a lil. 2 or so mpg's what i notice is it stumbles a lil between 3-4000 and its slow to take off. its dead til about 1000-1500, but after i start rooling its fine til i run it hard

Chris Senior Enthusiast

Chris

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would this apply to an 06 with the 4.8? just want to look forward to it on my friends truck if it does and give him the info

Chris Senior Enthusiast

Chris

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no i mean, can he expect the same problem soon. ive heard of this happeneing from 01-04

dennismc Enthusiast

dennismc

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This is only an issue on LS engines up to 04. 05 on up are gen 4 engines and the knock sensors were

 

moved from the valley cover to the side of the block.

Chris Senior Enthusiast

Chris

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so what was the issue with the knock sensors thats common. what made a lot of them go bad

dennismc Enthusiast

dennismc

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It wasn't really the knock sensors themselves, it was their location on the valley cover under

 

the intake manifold. Water would collect around the sensors and corrosion would occur wich

 

is why on the TSB they recomend a bead of silicone around them after replacement.

Chris Senior Enthusiast

Chris

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thats an issue gm should fix and not leave me to pay out the ass for

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