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 Can A Bad Knock Sensor Effect The Transmission And Cause Transmission Codes Its a 01 Cadilliac Deviile Where Is The Knock Sensor Located On A 2002 Pontiac Bonneville The temp guage on my car keep going into the red as if my car was running hot then My car started making a knockin noise before it just 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: Can Bad Fuel Petrol Affect Sensor,Bad Knock Sensor Mpg,What Effect Does A Nox Sensor Have On Gas Mileage,Knock Sensor Mileage Vibe,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?