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Discussion Starter · #1 ·
Replaced my PCV valve and hose today in my Duratec 2000. Typical hole in the PCV hose. Codes P0171 and P0174.

I noticed that when I had the air intake apart the air throttle/butterfly valve (... help me here ... what IS IT called?) just before the air manifold was quite oily/gummed up/ black stuff. See picture.

Is that normal after 76,000 miles ?

Should I clean it ? How ?

Will it affect millage/performace ?
 

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