Today we got the TBI;s main fuell map alot closer to being dialed in.
We did alot of poking around before actually changing anything...starting with timing diagnostics. The base was quite a bit off, @17, and with the vaccume plugged in we were maxing out the timing light with it running 50@2200 RPM... Ideally it should be running no more than 36 no matter what.
SO, first off we pulled off the dizzy cap, and removed the vac advance diaphram, then we welded a few beads into the hole where the vacume actually advances, greatly reducing how far it can advance. After taking it off and on a few times and hitting it with the timing light and shaving accordingly we made it so that the most it can advance is 36.
That helped alot, and the difference is HUGE.
Then we played with the air fuell mixture using a special snap on voltmeter deal that is some sort of crazy auto computer and can calculate all sorts of crazy stuff. From there we developed our basic main fuel map setting.
We also replaced the plugs and determined from their condition that it was running just about where we wanted it...not too rich like it had smelled.
More to come.