I have a 1997 olds achieva 4 cylinder with 85K miles, My mech runs the OBD and says the 02 sensors are bad. It is now on it's third set of sensors in less than a year. Currently the car is blowing heavy black smioke, fuel mileage is terrible and it misfires under load. I pulled the 4 wire 02 sensor out of the catalytic convertor and the heavy black smoke went away. It still misfires under load but not as bad. I was thinking about also pulling the 02 sensor before the cat converter to see what happens. I have done a complete tuneup on the vehicle to no avail. Any ideas? Will it harm the engine to leave the 02 sensors outside the system but still hooked up?
Friday, December 29th, 2006 AT 11:58 AM