[carbking]

Originally Posted by Hurst65

I finished installing the wideband gauge this morning and started to do a little tuning.

The idle was pig rich! Jon, you were right! The gauge was reading between 12.12 & 12.5:1 at idle. So, I turned the mixture screws in all the way and then back out 1 turn. That proved way too lean-- the car wouldn't idle well and the gauge was pegged out. I then went another turn out, for a total of two turns. That was a close but, a little too rich. Right now, I'm at 1.75 turns on the mixture screws and the gauge is reading about 14.5:1.
I never knew that the mixture screws were that sensitive. The slightest little turn makes a big difference!

I think I'm okay with the idle. It idles real nice at a steady 900 RPM, w/15 degrees of timing, pulling 11" of vacuum, and the wideband gauge reading 14.5:1. The idle is really smooth-- almost stockish.

Ok.... so, then I went for a short drive. The mains are pig rich too! The gauge was reading about 11:1 to 11.5:1, in any gear, at 2500 RPM. How much of a jet change do you guys think I need to make?

Thanks!

Have you changed the spark plugs yet?

Running as rich as the engine has been will foul the plugs to the point the wide-band will not be as accurate as possible; as the fuel-fouled plugs will not produce the same spark as they would when new, thereby sending a false reading to the wide-band.

Once you get close on both idle and main...............CHANGE THE PLUGS! You will probably find you need to adjust a wee bit more (leaner) on fresh plugs.

And yes, if you need the spring kit, we still have them.

Jon.