Inside the throttle body

GTamas

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I had a look inside the TB tonight and I was surprised to see this behind the flaps:
20240625_223934.jpg20240625_223946.jpg

First I was shocked to think it is metal dust, but it is soft greasy thing. I know you should not clean the TB bore because of some special coating.

Have you seen such stuff? What is that and what should I do with it? Leave alone, or clean it somehow?
 

ttocs

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is the entire intake from the butterfly valve back black? I have not looked at a stock intake for some time but I don't remember them being like that.
 
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GTamas

GTamas

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is the entire intake from the butterfly valve back black? I have not looked at a stock intake for some time but I don't remember them being like that.
as far as I see it is black
 

ttocs

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I was waiting for one of the pro's to comment as the last time I looked inside of stock intake was about 10 years ago when I ported the front from 70-75mm, and can't remember what I had for lunch yesterday. I can understand a rough texture from how it was cast but I do not remember the black layer.
 
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GTamas

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It is soft, greasy to the touch. Reading your comments I think it might be mostly caked oil-mist from the PCV, accumulated over the past 30 years. Intake was never opened or cleaned before.
Even those silvery bits are soft and greasy. I just wonder why they have different colour and structure.
 
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GTamas

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I think I will leave it like that for now. Over the winter I plan to replace the intake to a cobra one.
 

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