I just had the opportunity to experience the dreaded e/check that is required before I can renew the registration on my 87 240. This is required in several counties in Southwestern Ohio (Cincinnati area). The car has 180,000 miles is well maintained and runs like a champ. The O2 sensor has 20,000 miles on it. Within the last 8000 miles it has had new plugs, air filter, valve lash checked and within specs, and compression test (145-150 all cylinders). The throttle body was cleaned and all electrical connections in the FI system cleaned and dielectric greased. The timing was adjusted and and I ran a can of BG44K through the system .
I had to sit outside and wait 50 minutes while they tested two cars ahead of me in line. I don't know how the first car did but the IROC Z in front of me failed. They called two different supervisors to the console for the Z test which took 30 minutes. The stage was set- nobody seems to understand what is supposed to happen.
My car passed the HC and NOX portion of the test but showed 59 grams/mile CO and the limit is 30. Anybody have any ideas on possible solutions to improving the CO level?? I honestly don't think there is anything wrong with the car but until I can convince the computer of that I won't be able to renew my registration. Any suggestions (legal and nonviolent preferred) appreciated.