Hello,
I have a 2004 C5 Z06 Corvette catalyst monitor is not wanting to complete. Tune is perfect, front and rear 02 sensors are new, both cats have been replaced with CA legal replacement cats. The only 2 monitors that are remaining not complete is catalyst and evap. Any suggestions or driving process to get the cat monitor to clear. The engine is modified, LS6 with a 4.0 stroke, mild camshaft upgrade, LS2 intake with evap, LS7 throttle body, LS2 stage 2 CNC ported heads, 11.5 to compression. The map and maf tables are all tuned and the long term fuel trim is +or - 5 max everywhere. I've heard the Corvette can be a pain and I've done the 55mph drive cycles several times plus a long road trip with an overnight cool down and repeat.
Thanks,
Steve