Miss after 5 min, runs great over 3000 RPM

[Funracer]

Originally Posted by rollinsperf

I drove the ZR1 with a scanner on it yesterday and found that the RH O2 sensor went to .724 and stayed there. Shut the car off, drove it a little later, same thing. New RH O2 and the car runs great, so good that after an 8 mile thrashing I could finally verify the starter hot soak problem. 3 hours later, the starter would work again.
Thanks for all the great suggestions

Which scanner did you use?

[rollinsperf]

Snap-on MODIS, I watched the O2 sensors and after it warmed up on 1 the crosscounts went up and the other it went down eventually to 0. The scanner is not as fast as a lab scope, but it got the job done.

[Hib Halverson]

Replace the other O2S, too.