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I am having some difficulty with my O2 readings now...

At highway cruise, 100kph (60mph) around 3000rpm, I am getting closed loop cycles between .30-.45V, sometimes lower. When I drop the hammer, it only goes as high as .80 too...whereas the former readings were between .40-.60 at closed loop and nearer to .90 at WOT. The fact that the O2 readings are still cycling must mean that the sensor is still working, and that both fuel pumps (don't ask, its an interesting setup ) are running properly (because if they weren't, it would still be cycling at the proper levels...the ECU wants to see stoich, not lean, at cruise). So what I am wondering is it normal for the sensor to age so dramatically? I mean dropping .10V in a short period of time is kinda harsh.

I intend to check my pumps again tomorrow, and double check the connection at the O2 port off the ECU to make sure it is all good, but outside of that I guess I am looking for a new O2...anyone got one?

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Early 2000's: 1992 Summit sedan - 14.1 @ 100.9mph w/ 155/80 13s
2012: 1989 Dodge Colt GT Turbo - 14.9 @ 100mph, 10psi/s16G

Don't have an O2 for ya but they should be fluctuating between .10 and .90 once you are in closed loop. Sometimes an exhaust leak in the manifold before the O2 sensor can cause some funky readings or the head of the sensor just gets gunked up.

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Is it bad if I'm driving in closed loop at part throttle and keeping a constant speed and I get a O2 voltage of 0.00 but if I do a WOT run it runs about .92 is that normal or should the O2 be replaced?

does everyone have their downpipe ground strap attatched?

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