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'Marble sound' on cold startup on a 2019

398 views 5 replies 3 participants last post by  Brewster100  
#1 ·
My neighbor noticed the other day- a 'marblely sound' that just lasted less than a minute. I checked today - and yes it sounds like marbles rolling around for about 30 seconds and then 'silence' (normal running). Worst case - could it be timing chain tensioner? Water pump?
 
#6 ·
Update
They found that the tensioner was 'bleeding down' as the car sits. $1700 repair picked up by Endurance. $100 deductible and cost of timing chain and misc. parts out of my pocket (~$300). They consider those parts as 'wear items'. I'll be sending GM bill for that- which of course they will 'file 13'!