I may be way off base on this but the exhaust gasses are under some pressure
and are leaking out of the pipe which shouldn't cause any change in the
composition of the gas, just a reduction in volume going past the O2 sensor.
Since you're not introducing anything into the exhaust stream, the leak
shouldn't have any effect on the oxygen concentration.
Have you looked at what jets and blocks you're running. With the 37mm
venturies and a B cam, the stock jetting was somewhere around a 165-170 main
fuel with a 250 main air on an OA jet block. The Bob Sharp manual notes
jetting of around 180 fuel and 240 air but that is going along with the
other racing mods they talk about in the manual. I think that would be rich
for the street. I've heard that the 8 jet block doesn't run right in the
2000's but haven't tried it myself yet. Anyone know? Also, the idle jets
are supposed to be 55's or 57.5's and the idle mixture screw should be at
about the halfway point in it's range. They say that if that screw ever
gets tightened down that it can be damaged and will not meter correctly
afterward.
Just some thoughts.
Brian
-----Original Message-----
So I can't decide how a leak in the exhaust will effect the reading
on the oxygen sensor.
Right now at idle the meter reads really lean then when driving it
reads really rich-almost as rich as the meter can register.
Daniel 69 2000
SF CA
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