I tested a suspected bad mag sensor (crank position sensor) with an oscilloscope. I tested it while cranking with the sparkplugs out - first at the sensor plug, and then at the Motec ECU plug to hopefully account for possible bad wiring.
Do these waveforms look OK? Two observations:
- The center line looks a little fatter than I expected.
- One of the waveforms in the first screen shot looks mis-shaped. Could this represent some interference that could cause issues in the signaling to the ECU? I'm not sure if this is within the realm of normal to see in the output of an oscilloscope.
Thanks.
Scott