31 Mar 12 10:20, Mark Hofmann wrote to Roy Witt:   
      
    RW>> An O2 sensor won't give you much of a warning. It just loses its   
    RW>> ability to perform as intended, messing up the MAF/O2 loop reading.   
    RW>> i.e. my Z28 used to give me fits with O2 sensor codes (check engine   
    RW>> soon), but that stopped after changing the 'brand' of fuel used.   
      
    MH> As part of the 75% rebuild of my Monte Carlo, I did replace the O2   
    MH> sensor - about 2 years ago.  One day, I just received the "Check   
    MH> Engine" light.  I took the code scanner out of my trunk and checked   
    MH> the code.  It had to do with the O2 sensor (front bank) not getting   
    MH> to the proper temperature.   
      
   If this was after the intake manifold leak, it could be that the engine   
   sealer used to fix it wasn't 'O2 sensor safe', meaning that the silicon in   
   the non-safe sealer has ruined the O2 sensor...   
      
    MH> Apparently, my first bank O2 sensor is heated to make the system go   
    MH> to closed loop faster.  The heater element on the O2 sensor stopped   
    MH> working. Replaced it and all was well.   
      
   Does it have more than one wire? If not, it's not heated, other than by   
   engine exhaust.   
      
    RW>> Insulation? No. Sealed connectors, no. Cars with non-sealed   
    RW>> distributors, yes. Cars with old frayed wiring (no insulation left   
    RW>> on them) no. At least not as long as they weren't hot wires touching   
    RW>> ground.   
      
    MH> I'm going to give that a try on the Durango - since there is still   
    MH> areas of "crud" in there from the antifreeze/transmission fluid   
    MH> explosion.   
      
   That shouldn't give you any problems. If it does, just open the wire   
   connectors and use a little bit of compressd air to remove any moisture.   
      
    RW>> I put a high performance Granateli MAF in my Z28 back in   
    RW>> 2001/02...it's still going and I also kept the original, stored in   
    RW>> the Granateli box...   
      
    MH> I do the same thing.  When I replace a working part, I save it in   
    MH> case I need to switch it back out.  I'm amassing a nice collection of   
    MH> stuff.. :)   
      
   Sometimes I wish I didn't have that habit. Moving from CA to TX and   
   packing all of those 'spare' parts took up a lot of time and moving van   
   room. Then I made the mistake of 'unpacking' them and now I have a bunch   
   of it to move out to the storage shed to make room for my verticle mill...   
      
                   R\%/itt   
      
      
     ... Only those who will risk going too far can possibly   
     ... find out how far one can go ~ TS Eliot   
      
      
   --- Twit(t) Filter v2.1 (C) 2000-10   
    * Origin: Roiz Flying \A/ Service * South Texas * USA * (1:387/22)