i rebuilt my heads in the fall, , installed edelbrock headers, 3" custom exhaust, and did a little ignition work, i noticed in shop class on the scanner that my O2 sensor wasnt giving much output, no crosscounts, wouldnt go into closed loop for the 5 min it was running on the scanner( plus it was already relativly warm), and now i found a black watery residue in my tailpipes, it smells like fuel, but looks somewhat like oil, is this just excess fuel and carbon from a bad 02 sensor? or am i overlooking something???????

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91 Z28, White on Red
TPI 350, Rebuilt heads,K&N's, MSD Wires, Accel Supercoil, Accel Ign. Module, MSD Cap and Rotor, Edelborck T.E.S headers, cat!,custom 3" with 80 Series Flowmaster, 3" stainless tips, Jaz seats, B&M Megashifter, Alpine stereo system,17" Eagle 203's

 

sounds like its time to replace your o2 sensor......

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Scott Downs
85 Trans Am
305 tpi/700r4
3.73 w/255/60R15
plain firebird nose(for better engine cooling)
T-Tops, pwr everything
been to about 140mph