My '78 SC has been showing perfect numbers for years....until just last week. I have some ideas on why but would like input. Both numbers were high in the 3+ range and need to be below 2. Tech said it was running rich but can easily adjust that if need be.
1. Car had not been driven in two weeks and I did not take it out and run it hard for half and hour like I suspect I should have before going in for smog.
2. Tech had trouble getting computer to boot up so he let the car just idle for about 15 min which I HATE to do.
3. Computer had difficulty recognizing RPM's and never really agreed with the tach on the dash.
4. Been using Premium gas for years but some say that Regular will help with smog results. ??
5. Friend rec a gas additive
called 'Blue Sky' to help with emissions. I never heard of it ....anyone ?
This was a pre-test only and am due to try again in a week.
Advice Please...