YOUR RESEARCHWhat is the foam inside the air box for?
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
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1 matching discussions · 5 captured posts examined · 0 partial discussions
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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Makes no difference what so ever.
No unique explicit quoted action; no causal link assigned
Generation: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So my foam inside the air box was deteriorating, so I removed it. What is it for? I am not sure if this is a symptom of the removal but I washed the car and it had the underspray, my car started making a humming/howl that cleared after the car wash. I was thinking a belt slipping or possibly the water collecting in the bottom of the airbox without that foam piece causing the drain holes to plug temporarily causing the horn like sound.
My guess would be resonance absorption. Does the foam, once removed, expose any holes or cracks where water would enter?
Any pics?
None, I threw it out. It was deteriorated. I will look on the internet.
Found this response to the same question on Renntech, what I am suspecting hence the noise I heard. Also considering I have gone to this car wash before and never heard it. Contributing Members 305 posts From:Richmond, VA Reputation: 3 Neutral Posted May 29, 2013 - 11:43 AM Renntech: Tossed away the one in my 2002 C2 5 years ago. Makes no difference what so ever. I personally think it was to absorb a slug of water, or provide a toturous path for water that might enter through.
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