Carb is a 32 adfa which has a new needle valve and a gasket replaced, float was adjusted to 6.5mm, air corrector jets are both 1.75, car came with those. New cat, all smog equipment is present and functioning, points have been replaced with an marelli electronic ignition set-up from a 79 CA car, new marelli plugs, idles smooth around 1500-2000 rpm depending on the choke. Also worth mentioning the timing was set to 10° instead of 0° ±3°.
I need to figure out ways to lower the CO%, after reading every post concerning fiats and carbon monoxide, I found a similar sitution a guy had in 2006,
Not really looking to add denatured alcohol to fuel, but something has to be done to bring CO number down, all feedback is welcomed.I had the same problem a year ago at the same inspection station that Bobs been going to- I failed the loaded CO by a lot. 6.45 (1.65 max to pass). Also failed the HC at 291 (250 max allowed). Before the retest I tried the typical tricks, retard the timing and add 1 part denatured alcohol the four parts gasoline in the tank. Even still, I think the biggest problem was that the inspector performed the load test in second gear. I'm not sure what speed the test 'rolls' at but the RPM's were screaming. On the retest, I sat in the passenger seat (again) and requested the inspector put it in third gear. Initally he resisted but when I pushed him on this point, he complied and ran the load test in third gear. RPM's were a lot lower and the results were significant. CO went from 6.45 to .25 and HC went from 291 to 62. Idle results were essentially unchanged. I'm keeping my fingers cross that the other Bob has the same results!
