BlackMax62

Hey all...just wondering what a knock sensor does...ive heard that it affects the performance and my car has been feeling a bit sluggish...any help would be appreciated...

sabe

dlee275

Knock Regulation - Economical fuel consumption and high torque can be achieved by higher compression ratios in the engine. Increased compression ratios, especially as a result of turbocharging, can lead to pre-ignition of the air-fuel mixture. A knock sensor can be used to control ignition timing to prevent knock from damaging the engine. If the knock sensor detect pre-ignition the ignition timing can be retarded to prevent pre-ignition and then slowly advanced back to the original value. In turbocharged vehicles, the knock sensor can also be combined with boost control to cut back boost pressure if the knocking persists and then slowly restore boost. Knock control allows more turbo boost and higher compression ratios for more power while still protecting the engine from knock damage. The octane rating of gasoline at the pump is a measure of the fuel's ability to resist pre-ignition. When high octane fuel is used in a vehicle with knock control the engine can adapt to the improved fuel quality and deliver more power.

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https://maxima.org/maxfaqs/sub_gener...html#General_5

Daryl