FC 45

[EFISYSTEMS at aol.com]

HI Matt,
    I'll make a judgemental call with little data,,,,,,,either your fuel 
pressure is too high or you have a restriction in the exhaust(such as a 
plugged cat).........but if you have changed nothing and this proves to be 
true....you still have to find what happened.
-Carl Summers

In a message dated 99-05-20 08:28:48 EDT, you write:

<< Subj:	 FC 45
 Date:	99-05-20 08:28:48 EDT
 From:	m.s.bower at cummins.com (Matt S Bower)
 Sender:	owner-gmecm at esl.eng.ohio-state.edu
 Reply-to:	gmecm at efi332.eng.ohio-state.edu
 To:	gmecm at efi332.eng.ohio-state.edu (gmecm)
 
 Hey guys,  I could use some advice on this.  I have a 93 s10 blazer with
 cpi.  It's setting a fualt 45.  Using the scan tool I am seeing that
 when I cruize at highway speeds the O2 sensor voltage will hold at .85
 volts and after a couple of minutes it will set the code and kick it out
 of closed loop.  It then holds O2 volts at .92 and will stay usually
 until I go back to start stop driving at which point the ecm goes back
 to closed loop and the O2 sensor starts swinging from .1 to .8 volts. 
 Any ideas as to what I am not seeing here?
 
 Thanks Matt.
  >>