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The following actions were taken in order of time needed to perform them…
Verified that the plug wire was transferring energy to the #1 plug by removing (from the spark plug, not the distributor) it and holding it close to the engine block. The presence of a spark at regular intervals demonstrated that the wire was acceptable. Also the ignitor and distributor were OK because the other 5 cylinders were firing normally. After changing the #1 spark plug, the symptom remained. This verifies the presence of a spark in the cylinder.

The timing was checked using a timing light pointed at the flywheel inspection port on the passenger side of the vehicle. More details of this procedure later.

The valve cover was taken off to view the valve stems. The valves for cylinder #1 were seen moving up and down with the rest of the valves. This verified that the valves were not open due to the rocker arm. A feeler gage verified that there was some clearance between the rocker arm and valve stem when the valve was supposed to be closed. The actual measurement was not important at this time because the inspection was to only verify that the valve was closed.

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