One of the cylinders has no compression.
Loss of compression in a cylinder is a sign of physical/mechanical damage such as; a bent intake or exhaust valve, a leaking head gasket. Or possibly a hole in the piston, block, or cylinder head. The combustion chamber could also leak from the spark plug hole if the spark plug wasn’t installed properly. You can get a proper cylinder inspection by a technician in order to find the source of this issue.
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