'87 MC 2111 fault

["Matt Martinsen" <mattmartinsen@hotmail.com>]

When I first aquired the car in June, I pulled the codes and everything 
was fine.  A few months later (after I pulled the head) I pulled the 
codes again and got 2111 (RPM sensor).  I have not been anywhere near 
the flywheel or disconneted or otherwise molested anything associated 
with this sensor.  I figured it was a fluke as the car ran the same as 
when I got it, there was and is no change that I can tell but I still 
get the code.  My understanding was that the car won't start if the RPM 
sensor is really defective (I know the 3B won't), if not then what are 
the symptoms?  BTW there are no other codes, yes I am following proper 
procedure for pulling the codes (i.e. car left running, been run at 
boost, been >3000 rpm, etc.)  I recall something on the 20v list a while 
back discussing the same situation but don't recall what the group 
consensus was.  Curious, does the output from this sensor go the the 
tach too? (works fine)
-Matt Martinsen

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