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homemade87 · 07-17-2017, 07:40 AM

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 .

07-17-2017, 07:40 AM	#3
homemade87 Registered User 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 .