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If your fitting was plugged, your sensor was most likely plugged as well. Were you able to clean that out too? Mine was so packed, after trying to dig it all out, I just bought a new one.
This winter I been notice alot issues of those in Michigan. People tell me how horrible mileage they get now.
I notice tons carbon in line. But is there way to melt out carbon like chemical that soak though it ? And I can't risk loose that line they will snap due rust on fitting to exhaust manifold.
I had to use Berryman's on a friend's tube the other day.With that and some weedeater cord it finally freed up.Wear rubber gloves with that Berryman's,it is pretty aggressive on the skin.
We had the tube disconected from the truck.I would not spray the Berryman's into the manifold.