Walt, It's my understanding that no part of the exhaust system is "supposed" to glow. I made mine glow twice by accident. It was explained to me as raw, unburned fuel dumping into the cat and burning there. So....I think you're still too rich. I believe if you keep that up, it will fuse the cat guts and you may incurr a clogged exhaust. I agree that if nothing you do affects the freq valve duty cycle then your O2 sensor or lambda box may be dead. (although I've been told that the lambda computer never fails) Hm, also now that I think about it, a stuck WOT microswitch will also override the lambda computer and freeze the duty cycle. I think mine may do this. I need to put my multi meter on it. Rich #5335 --- In DMCForum@xxxxxxxxxxxxxxx, "Walter Coe" <Whalt@xxxx> wrote: > 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 Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=245454.3656312.4921743.1261774/D=egroupweb/S=170512 6215:HM/A=1457554/R=0/SIG=11c6fnta2/*http://ipunda.com/clk/beibunmaisuiyui wabei> <http://us.adserver.yahoo.com/l?M=245454.3656312.4921743.1261774/D=egroupm ail/S=:HM/A=1457554/rand=604788620> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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