Oy.
280z still didn’t pass. But got some useful data.
From the previous post, I installed a new catalytic converter, popped in new spark plugs, and re-filled an empty tank with 87 octane. Here are the old / new numbers:
| CO% Levels | 1st Try | 2nd Try | ||||
| Speed | MAX | AVE | MEAS | MEAS | ||
| 15 MPH | 1.36 | 0.17 | 2.03 | 1.73 | ||
| 25 MPH | 1.16 | 0.15 | 2.66 | n/a |
1st Try: Catalytic converter was supposedly original, but no numbers when inspected. Bosch Platinum Plus spark plugs had heavy carbon buildup. Ran 91 octane gas.
2nd Try: New Magnaflow catalytic converter, NGK spark plugs and 87 octane gas.
Thankfully Nguyen from Smog Tech did a quick CO% test just to see where we’re at. It ran steadily at 1.73% CO, just 0.37% more than MAX. Okay, time to adjust the 280z’s AFM (Air Flow Meter) to run a bit more lean air/fuel mixture.
3rd times a charm, right?… right?
the DAILY DATSUN 