School boy error! Must have changed it accidently.

Lesson learned, always check your scope settings.

Thank you

Hello Here I have a Chevrolet Spark 2010 1.0l 16v. Starts and runs but lacks power with a slight misfire (incomplete combustion) at idle. Suspected valve timing. Timing marks are coloured chain links and only one mark on the crank gear. Old chain had stretched by one link. New chain fitted. Waveform...