car: 90 Accord LX auto

background: owner went on vacation for a week, ran til they left. car wouldn't start 3 days after they left on the first try. I thought it was the main relay since it started after a couple of tries. I moved the car forward. Four days pass and they tried to start it today. No luck at all.

It is not the main relay.

Has spark, Has fuel. I took out the spark plugs to check what was going on. And cylinder 1 the spark plug was loose to begin with. This was odd because I just did a tune-up to the car about 3 months ago and the same thing happend before. Also the spark plug looked like this.



The two plugs closet to the distributor still looked newish and the threads were still shiney. I did a compression test on the two outter cylinders and they were both the same compression. So i put in a new set of plugs and same thing? Maybe i did the compression test wrong?

anyone have any clues or suggestions?