Let's start from the root(s).
Black smoke is an indication of excessive fuel consumption. A leaking fuel injector, dirty air cleaner element, like jack have said earlier, a defective fuel pressure regulator, or defective fuel control sensor could cause this. You car is equipped with a catalytic converter; the rich mixture may cause a strong rotten egg smell
Your first question was to remove the O2 sensor to solve the problem.
The PCM monitors the activity of the converter by comparing the signals of HO2s located at the front of the converter with the signals from HO2s located at the rear. If the sensor outputs are the same, the converter is not working properly and the malfunction indicator lamp (MIL) on the dash will light.
Some mechanics can just replace the second HO2s because the computer pointed finger at it.
For me, the second oxygen sensor is telling your computer the truth about what is going on in your combustion chamber that may have cause the converter not to work as it should. Check your converter.
Converter is normally trouble free emission control device, but two thing things can damage it:
One is leaded gasoline, I'm sure you do not use that so I do not need to go in details.
The second is overheating. If raw fuel enters the exhaust because of a fouled spark plug or other problem, the temperature of the converter quickly increases. The heat can melt the ceramic honeycomb or pellets inside, causing damage to the to the exhaust valves due to the excess heat.
Let's come back to fuel regulator.
A fuel pressure regulator controls the amount of pressure in the system. Mechanical fuel pumps often contain built-in pressure regulators. However in vehicles with electrical fuel pumps, the fuel regulator is installed in the fuel system between the fuel pump and the fuel distributor.
If you do not find it, let an ASE technician take care of this problem.
Friday, December 29th, 2006 AT 6:36 PM