The few I have pulled out have all been tan in color on the tip - like a spark plug.

This one was black - like it was carbon coated.

I assume this indicates a rich running condition - caused by misfires , perhaps ?

Also, can these things be cleaned, or are they a "one shot wonder" ??


Thanks !!

Britt

------------------
'99 T/A
Best 13.071 @ 104.92
Now own '99 SS # 2073 !
12.969 @ 105.44

 

I am curious to this too.....mine were tan when I had a stock exhaust but after the heads and cam with longtubes the sensors have become black....is this related to the fact that I do not run cats? I know I am running rich so I am sure thats part of the problem.
Rick

 

if they are tan that is a normal o2 sensor.like you said just like a spark plug.if it is black then yes it is running rich but its probably because the sensor was already bad.you should go ahead and just buy all new sensors.