Quote:
Originally Posted by 40 Deluxe
Just a side note on the "crankshaft torsional deflections" that Terry mentions here: These deflections are large enough to be easily measured. In fact, every modern vehicle has such a device. It's called a "crankshaft position sensor", and one of its functions is to detect any misfire. It measures this crankshaft deflection every power stroke. If the cylinder doesn't fire, there is no deflection and the ECM records this. After a certain number of misfires in a given time frame, the ECM sets a code and begins flashing the "check Engine" light. The code will indicate which cylinder is misfiring (P0301, P0305), etc.) unless it's a random, multiple cylinder misfire (P0300). Interestingly, in the early days of electronic engine control, driving on a washboard road would rattle the crankshaft enough to upset the ECM and it would set a misfire code!
|
No it doesnt,the crankshaft position sensor works on hall effect,the passing of a steel reluctor wheel or tone ring (it has teeth,not unlike a gear) above a magnetic pickup.As the crankshaft spins the teeth/space coupled with the magnet makes an impulse,the impulse is read by the ECM.
https://www.samarins.com/glossary/crank_sensor.html