HC - 1.57 g/mile...Limit = 1.20
NOX - 4.42 g/mile...Limit = 3.00
CO - 10.3 g/mile...Limit = 30.0
Failing both the Hc & Nox tests may indicate converter problems. It has a chip. We're going to put a stock one in and retest. The test is done on a dyno. The driver gets into 4th at 30mph. Wish me luck.
It has a chip ? well thats ok I understood what you ment...
Reprogram the computer back to stock and if you changed to a 160 degree t/stat change that back also. You'll be doing your car a huge favor if your use the stock 180 degree t/stat. I can elaborate on that subject if you need me too.
There is no way a 96 needs a new cat.
Sounds like a good idea to put the Stock Chip back in. Could be the cause.
Perhaps your having a problem with the fact that the early ZR1's didn't have valve seals installed like the later MY's, and your burning a little oil!
GS796 is correct about making sure your ZR1 is up to it's stock operating temperature. I always take mine out for a good Three Digit Blast on the expressway before going for the state inspection! Cleans it Out!! :L