my4runner

Hello all, hope you can help me on this, my 4runner, 22re motor, well, its has been running really good, but when I went to start it on Friday, I herd this noise from the motor, but it started normally, but when I went to drive it, it was out of timing, the motor was pinging bad......so on Saturday, I reset the timing, now it runs great again.....would this have anything to do with the timing chain? Any suggestions would be appreciated...