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IF the chain timing wa at fault that implies the chain has jumped teeth,
that would knock the valve timing to hell,
meaning valves were open when thet should be closed,
that does happen.
BUT I've never heard of the chains jumping back into alignment just so you can go for a spin then jumping back.
Now it is concievable that a fault with the chain tensioners "could" create valve timing varience,
but that brings us back to oil,
as far as I can recall all 3 tensioners are ol pressured,
So I would want every drop of oil out the engine,
thats why I suggested squeezing the followers in a vice,
Which grantedis over 20 hours labour to remove and refit!
Though it is just possible to lever the followers closed while still in the head,
all oil must come out!!
Chain timing check is around 4 hours labour.
At that point if your garage has a cylinder leak down tester the exact cause of the compression loss can be pinpointed.
But even without all this if you were to come into me with the stated facts my prime suspect is still going to be oil problem resultng in jacked up followers.
It really doesn't take much for the follower to open the valve enough for enough compression loss to make a no start,
Ignore the CAS for now,
It's irrelevant until there's compression.
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