Im trying to clean out the exhaust backpressure tube? How far should i be able to shove say a piece of plastic weed eater line in there, and is there a sensitive way to clean the inside of the sensor, its CAKED.

 

anybody???

 

The best way i found to clean the tubing is to remove it.. Unless it is rusted to the manifold, it should come off pretty. My sensor was also pretty dirty so i just bought a new one on ebay for $25. P/N 4c3z-9j460-a is a newer revised sensor..The following link will take you to ebay and the guy i got mine from. He has another one available...
http://cgi.ebay.com/ebaymotors/Ford-...QQcmdZViewItem