Thanks everyone, I recieved responses from lean mixture (computer
controlled), to timing (most likely culprit), to clogged cat (not the
problem), It would appear the problem is a mixture of three things. First
the #1 plug wire shorted out and melted up against the manifold. So it was
feeding unburnt fuel into the manifold. Two, (not sure about this one, but
its easy) The bolts holding the exhaust to the manifold need tightened -
might be letting some air in. and three (the big reason) the timing is too
far advanced. It is set according to the book 8 deg BTDC, however, it was
set something like 35 deg BTDC when I started on it. I figured it was a DPM
thing (everything else is on this car). I will fix these tonight and let
you know.
Again, Thank you EVERYONE!!
Patrick Bowen
-----Original Message-----
From: FODFARTS@cs.com [mailto:FODFARTS@cs.com]
Sent: Monday, January 01, 2001 7:26 PM
To: pbowen@intellinetics.com
Subject: Re: Non-LBC: Sunbird with glowing exhaust manifold - need help
in a h urry
It could be timing or possibly mixture. If the timing is off a fair amount
the exhaust could still be burning as it exits the head causing the glow. If
it is mixture a lean mix will cause the combustion temps to run quite high
causing the exhaust temps to be high as well. One other thing I thought
about
is the air pump if it has one. Was it connected and working before the head
work? If not then it might be now and leaning the exhaust gasses as they
exit
the head, raising the temp. Other than that I can't guess as to what might
be
causing it. Hope this helps a bit.
Brad
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