TealZR1

After evaluating the TechOne readings, it appears one or both of my 02 sensors are malfunctioning due to a consistent "open loop" and wide variations of readings low to high and back and forth when the temperature is fully warm in normal state when both fans are functioning ok.
This is a fairly new 91 ZR1 to me. Headers and true straight pipes w/o catalytic converter are in place now. Someone ran about a 3 foot line on each of the front 02 sensors from the headers to the exhaust pipes. Appeared spliced in to make the adjustment for the headers.
My replacement Denso O2 sensors only run about 12 inches in length and far to short. I've seen extensions out there for sale but any input for replacing the current setup is appreciated! Is this typical for aftermarket headers and straight pipes? Thanks in advance

Z51JEFF

TERMINAL SUPPLY has all of the OEM connectors and plugs you can use to build an extension harness,all plug in and no splices. I’ve done this for the sole purpose not to have to cut any wires. I can build what you need with factory crimps if you send me everything.

Dominic Sorresso

O2 voltage swings are the norm. The O2 goes from Rich/Lean constantly for O2 Cross counts. Its what keeps the Cats happy.
You want the O2 sensors as close to the motor as possible.

Paul Workman

To better facilitate O2 access, I installed bungs on the side of the collectors so the sensors point toward the outside about 85 degrees from vertical. Now they can be swapped w/o even jacking up the car.

As for the crossing between high and low, a "lazy" O2 will not vary much which is acrually indicative of a bad sensor.

TealZR1

Thanks for responding. Here is a short vid I took at full operating temperature showing on a tech one the 02 sensors reading:

Look normal?

https://photos.google.com/share/AF1Q...NpTGpob1JXbnJ3

Thanks for copying and pasting if needed in your browser and appreciate the help

FASTAZU

If thus was at operating temp you should be in closed loop,

Dominic Sorresso

If this was at > 80C Coolant temps, it should have been in C/L unless the calibration had been modified. Otherwise, the odd output coming from the Left O2 would keep the ECM operating in O/L.