Just finished watching this video . Car was running bad . Eric pulled the codes , one of which was cam / crank correlation error . Put the scope and compared the wave pattern to a known good he found on the internet . Discovered one was advanced something like 30 degrees from the other .
Evidently the cam phaser is operated by engine oil being used as a hydraulic fluid . He tested the servo / solinoid that applied oil pressure to the cam phaser . It clicked . Texted the other . It did not click , even though the coil was drawing current .
This is exactly why I change the oil / filter ( full synthetic DEXOS ) twice as often as the guess-o-meter indicates . Do not want things like this stopping up / sludging up / freezing up .
https://www.youtube.com/watch?v=aWJLUzqK0r0&t=3s
Evidently the cam phaser is operated by engine oil being used as a hydraulic fluid . He tested the servo / solinoid that applied oil pressure to the cam phaser . It clicked . Texted the other . It did not click , even though the coil was drawing current .
This is exactly why I change the oil / filter ( full synthetic DEXOS ) twice as often as the guess-o-meter indicates . Do not want things like this stopping up / sludging up / freezing up .
https://www.youtube.com/watch?v=aWJLUzqK0r0&t=3s