Posted for "Matt Hapgood" <matt.hapgood@alumni.duke.edu>:

 In 6 years of flying my EFI system on my Lancair 360 the ONLY failure I had
 was the crank position sensor.  Fortunately I had redundant systems, but it
 did get quiet for a second!  Those GM sensors were crap.  After several
 failures I finally found a company in CA that made a high-quality sensor, of
 which none failed in about 400 hours of use.  My automotive type system
 worked from -20 to +100 degrees F, and from sea level to 18,000 feet.  I
 operated it without an O2 sensor 99.9% of the type - I just developed tables
 that the system used in "open loop" (or was that "closed loop").
 
 Matt


"""
 The down side is if anything goes wrong, it can easily just stop.  My new
 Chevy Suburban was dead on the side of the road, when a $5 crank position
 sensor went south.  Luckily, it's way too heavy to get off the ground in the
 first place {grin}.
"""