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Clouds of black smoke gone 700

posted by  someone claiming to be riverol on  Sat Mar 2 09:49 CST 2002 [RELATED]

All I can think is that it was (mild) silicone poisoning of the O2 sensor, now more or less cleared by hot exhaust gas. I checked voltage on the O2 sensor a the time of the black smoke, and read a constant .87 volts. Now, O2 sensor voltage fluctuates again like it should. Still, it is the original O2 sensor on an '86 car with over 150,000 miles! So, it is probably time to put in a new sensor to be safe rather than sorry. Anyhow, can you think of any way that the G-valve set at around 10 psi could have caused the black smoke from running too rich? Turbo hoses are new and without holes. I checked for holes to be sure. Vacuum is tight with vacuum/boost gauge reading eight O'clock at idle in neutral, nine O'clock at idle in drive holding the car with the brake pedal. Vacuum also drops like a rock down to seven O'clock upon lifting off the gas pedal. Thank you for your reply and best regards.






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