sensor removal,i've soaked it with liquid wrench,numerous times,tried with engine warm,engine very warm,engine cold,I'm pretty sure it's the original and seems to have become 1 with the exhaust manifold,even got the deep socket tool,since the crowsfoot wasn't working,is it time to really put some torque to it?getting my propane torch up to heat the bung is difficult to get in there???after my trip I got @16mpg on highway,it shoots a 13 and 44 code,have @.5dcv from ecm and less than .250 from sensor warm,pretty sure the O2 is lazy or dead,the exhaust is very rich,is this the ecm widening injector pulse to compensate for to much air(lean low voltage from sensor)??really want to get this changed,and hope I've not ruined my cats

 

3' cheater bar on the end of a breaker bar. I have an iron pipe of that length for such purposes. Did my Caprice in a jiffy.

 

will really put some torque to it then,just was worried after reading searches that talk of bung striping out etc......

 

Do whatever it takes to get the sucker out!

Remember everything can be fixed, if you bust the bung weld a new one in

 

Case of pop and a mechanic on a slow day.

You need oxy/ace and get it red hot, but you probably started to strip out the nut, sooo maybe just order a bung and remove the exhaust. Drill the hole and clean it up, a normal person with welder setup would take 1 minute to weld it on.


BTW, 84z nice REV, i just bought an 05' 500ss myself.