06' just hit 33,000. Sat all winter, oil changed a few weeks ago. Noticed a ping, chirp, sound, etc? from engine while on recent trip. All gauges were good and ran strong. Put some 93 octane in. Will ...
Was the sound while accelerating only? If so adding 93 should solve the problem as the gas today has a bunch of stuff that degrades after sitting that long. If all the time then the above by MichF and using a hose to your ear may help find the location.