1998 Chevrolet Cavalier, 5 speed mileage: 63,000. I have had a problem that can't seem to be repaired. The EGR valve does not operate properly - this car has had 4 replaced and cleaned at least twice. The car acts like it is stalling - the rpm gauge will rev up and down as you're are idling. It will work fine for a week and then start acting up again but not all the time. The next to last diagnosis was that there was dirt getting into the valve. The line was scoped. The latest, different dealer and different mechanic, said that moisture is getting into the valve. A new thermostat was put into it and the pipe leading to it was wrapped. Very little difference was noticed. The mechanic who last tested it said that the valve was only opening 30% when it was acting up and thus if you were going uphill your power would even seem less..
Nov 10, 2010 at 4:48 AM