emac

As they say, if it ain't broke don't fix it! Well I have a 81 SC 3.0 and for the heck of it I decided to adjust the CIS mixture. (Fine tune) Anyway I forgot where I started and know its not right. After a while I was able to get her to start and run. Actually it seems to be running very good. My problem is I don't have a O2 sensor and wonder if there is a way to get it close as we did with carbs.
I know I did a dumb thing so have mercy on me.
Thanks to all in advance.

Bill Gregory

Ernie,

Too bad you don't have an O2 sensor installed. On the 80 and later SC's there's a port you can plug a duty or dwell meter into to see how the FI is pulsing lean or rich. Very useful when tuning the CIS mixture.

If you have a CO% meter, with the O2 sensor disconnected and engine warmed up, you'd look for .4% to .8% CO at idle.