Page 1 of 1
vacuum advance question
Posted: Fri Jun 15, 2012 12:27 pm
by CopenhagenCowboy
On my 258 with a Rochester 2g carb should the va be ported or constant vacuum?
Posted: Fri Jun 15, 2012 12:45 pm
by Grumpy
Ported...
Posted: Fri Jun 15, 2012 1:25 pm
by CopenhagenCowboy
There is NO ported vacuum on my carb, unless its malfunctioning. It's been set up this way for a long time and haven't had an issue, but after I drive for a bit it starts to idle really low and die eventually. Messed with my timing and idle speeds but nothing seems to make a difference. Didn't find any vacuum leaks, messed with fuel pressure, can't seem to figure it out.
Posted: Fri Jun 15, 2012 1:40 pm
by Grumpy
Posted: Fri Jun 15, 2012 1:54 pm
by OldGreen
Nice work Grumpy!!
Posted: Fri Jun 15, 2012 2:02 pm
by Grumpy
Needed it for Steve way back when we started...
Posted: Sat Jun 16, 2012 5:06 am
by Wrench
Sounds like the idle circuit is running too rich (too much fuel). A rich condition helps on warmup, but hurts at operating temp.
Make sure your choke is operating properly (fully open when hot) before you start changing fuel adjustments elsewhere.