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I have a 2017 Equinox 2.4l Ecotec , started running rough the driveway did a compression test cylinder 4 was low , after tearing down discovered a piece was missing off of a valve
17631
 

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OK here are a bunch of questions for ya.... Did you find the piece? Or did it go out into the converter ? How is the piston and cylinder wall ? Is that oil covering the valves ? How many miles on it ?
 

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Is the 2.4 an interference engine?! I’m asking because I don’t know...but that pic ain’t good!
 

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Also check for vacuum leaks near that cylinder as a lean condition can burn a exhaust valve causing a slow failure.
 

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Kind of odd to see all the oil on that chamber while the one beside it is normal. As asked above, how's the piston and bore look.
 

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Kind of odd to see all the oil on that chamber while the one beside it is normal. As asked above, how's the piston and bore look.
Without compression and not firing that cylinder will be wet and will not look like one next to it that is firing.
 
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