One problem related to engine grinding noise has been reported for the 1999 Honda Accord. The most recently reported issues are listed below.
When traveling at any speed, but primarily above 50mph the car stalls. I will pull the car off the roadway, wait 30 seconds and attempt to restart. At times it will take up to a couple of minutes for the car to eventually start. Around the same time as the onset of this problem the car makes a grinding sound when you turn the key to start it. The same sound you would her if you were to try and turn the key to the start position after it is already started. The amount of pressure you put on turning the key does not seem to make a difference. The stalling problem has me the most concerned for myself and others.