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


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