My '93 has 55,000 on the clock. I decided to drive it to work today as the weather was beautiful. I noticed while sitting at a stop light that I could hear a "ticking" or slight "knocking" sound. When I accelerated, the sound went away. My oil pressure was fine and didn't see anything noticible. When I got to the office, I raised the hood and really couldn't hear it but as I walked back toward the driver's door I began to hear it again. It appears to be coming from underneath the car on the driver's side right around the floor pan area. One other note, when you rev the engine, the sound does increase in speed but not relative to the engine RPM's. its slower.