Quote:
Originally Posted by oil pan 4
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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Great information, thank you! What would the knock sensor be used for on an 05 Civic? Would that be considered "modern"? Is it just a failsafe in case for some reason it knocks, or would it actually be used for realtime data so the ECU can optimize the timing?
To ask this another way, could simply using a higher octane fuel than what is recommended result in more ignition timing advance, or would nothing really change since there wouldn't be knock under normal conditions anyways? Thanks in advance