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In older fuel injected vehicles the knock sensor was used as a kind of a fail safe to keep them running smooth, only triggered by abnormal operations causing knock.
In newer engines it seems that the knock sensor is used as a real time instrument to provide vital computer input. It allows engines to get the best fuel economy running near stochometric air fuel mix buy running up to 50 and even 60 degrees of advance.
Modern engine control systems will keep adding timing advance while cruising down the road until a little knock is detected then the computer pulls timing back.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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