Home » Crank, Oil and Piston » How Much Does A Knock Sensor Effect Fuel Economy How Much Does A Knock Sensor Effect Fuel Economy 301 Moved 301 Moved The document has moved here. Tags:Economy, Effect, Fuel, Knock, much, Sensor Related Questions How Do I Replace An Oil Pressure Switch On A ’99 Chrysler Seebring And Where Is It Convertible, 2.5l engine My Car Has Plenty Of Oil In It So Why Has My Oil Light Come On I have a 1999 Holden Commodore VT. I checked the dipstick first thing this morning and the engine has plenty of oil in it. After driving it for 15 Answers for The Question bobweb It controls the ignition spark advance, so if the sensor says that the engine is knocking (whether it truly is or isn’t knocking), then the spark advance will be retarded and your gas mileage will be reduced. You will also lose power on acceleration. Country Boy Occasionally knock sensors whack-out other systems in the car. The transmission won’t shift correctly, low octane fuel will make the fuel mixture pre-ignite which causes excess heat in the combustion chambers. Valves, seats, pistons and top rings catch merry hell. Nobody knows how your spark advance works without a properly working knock sensor. It would be fun to stick on a properly sized MSD degree tape on your dampener pulley and check it with an inductive timing light throughout the normal RPM range. It’s the knock sensors job to regulate spark advance according to the grade of fuel you’re using. Low octane gas causes reduced spark advance when the sensor is working properly. When this happens fuel economy and power suffers at all engine speeds. Incoming search terms: Bad Knock Sensor Mpg,What Effect Does A Nox Sensor Have On Gas Mileage,Rsx Losing Mpg With Bad Knock Sensor,Knock Sensors Cause Bad Gas Milage,Knock Sensor Causes High Fuel Consumption,Is Gas Mileage Affected By Bad Transmission Sensor,Hazards Of Bad Knock Sensors,Does Spark Knock Effect Gas Milage,Does A Crankshaft Positioning Sensor Affect Gas Mileage,Does A Bad Knock Sensor Cause Poor Fuel Mileage?