Have a comppression test performed as suggested and if the compression is low, it could be someting else.
The cylinder compresion could have failed due to weak rings, and that is not because of water getting into the cylinders. It could be that the cylinder was misfiring due to water contamination to the spark plug wires etc and the continued misfiring had caused the loss of compression due to excessive fuel getting to the cylinders and cleaning off the oil.
Check for vacuum leaks at the intake manifold for the particular cylinder.
Monday, October 10th, 2011 AT 12:42 PM