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Old 07-17-2017, 07:40 AM   #3
homemade87
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Join Date: Apr 2010
Location: Guntersville Alabama
Posts: 1,073
Re: Changing Knock sensors in an LQ4

I never put the foam back in . It is a dust and water shield . Does more for dust . One of the common problems for the knock sensors in the valley is water gets in and they rust . Like ls1nova said , silicone the plugs in and seal them and your good . Also in my mind the foam helps hold heat under the intake . Of coarse I am more performance oriented .
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