We now know what the popping was. It was compression existing through the intake valve.
Should not be too much of a chore. You British have a long history of putting heads on the block.
We now know what the popping was. It was compression existing through the intake valve.
Get the battery charged back up. When you reconnect the battery. Positive first, turn key to POS II ( Run ), connect Negative. That will force the control modules to reinitialize.