Quote:
Originally Posted by benhogan
iirc, the knock sensor is the device that advances or retards the spark timing due to altitude or fuel octane.
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It doesn't measure either, of course, but rather--as noted--"listens" for knocking and changes ignition advance until it goes away.
Lots of mythology out there that equates presence of these to being able to successfully use low-test gasoloine where premium is specified. This is not the reason for these things being installed and not in the design parameters.