[DMCForum] glowing cat

["Walter Coe" <Whalt@xxxxxxx>]

I'm still several days behind catching up on this forum.  But today I
chatted with Mike C & Rich on the phone and had Samuel over all day
helping
me work on my car.

Anyway, about my cat:  It started glowing a lovely orange-red which is
particularly spectacular to see at night.  It was really just the output
side that was glowing.  I thought that the whole thing was "supposed" to
glow.

The situation is that I just replaced most of my fuel system: fuel
distributor, warm-up regulator and injectors all from DMC/Texas.  I tried
adjusting the air/fuel mixture using a dwell meter, but the duty cycle
pretty much stuck to 50% no matter how I adjusted the screw.  And what is
this crap I hear about these adjustments being sensitive?  I could give it
several turns before it would start to make a difference.  I'm thinking
that
maybe the O2 sensor is way out of range and the ECU is running on its
internal settings.  Whadda ya think?

I started off with Martin G's method of adjusting the mixture: depress the
plate 1mm and adjust the screw to where the injectors start to come on.
Right?  No problem.  The car started right away and ran fine.  I didn't
bother increasing voltage to the coil.

Waiting for the car to warm up, I wanted to be sure it was running too
lean
rather than too rich.  Otherwise I could damage my cat.  (Oh yeah, right.)
So I turned the adjustment screw CCW (roughly translates to
anti-clockwise)
as far as possible to where it was about to stall.  I ran the car like
this
for several minutes until it warmed up.  By this time the cat was glowing
red.  Is it that a too lean mixture will make the exhaust (not necessarily
the cat) run too hot?  Is this why it was the end of the cat that was
glowing and not the center?  Or have I been smoking some really good pot?

Walt



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