dirty intake plenum

94-5speed16

Registered User
hello,
I was working on my SC tonight taking off the air silencer, when i took the intake hose off and opened the throttle body and it was all dark inside the plenum. So i'm thinking that it's carbon from the egr building up, but i also noticed that whoever took off the intake hose last didn't put it on right so that it may have been sucking in som unfiltered air but i'm really not sure. It was looking pretty dirty, everying thing including the backside of the butterfly valve was dirty. Any help?

thanks
dan
 
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