Air/Fuel Question

[corylang@dccnet.com (Cory Langford)]

Thanks to all those replies.  It looks like the list is in agreement that
there is no real problem with lean with no load.  Lean with a load is what
you should watch out for.

I did richen it slightly at idle, and it made no difference under load so I
will leave it as is.  (the little richening seemed to give me a little more
oomph off the line)

Thanks again

Cory

At 09:32 AM 10/17/2002 -0400, Dan Bubb wrote:
>As long as your engine runs fine without missing while cruising I
>wouldn't bother trying to richen it up.
>With CIS (i.e. NOT lambda or E) there really isn't any way to change the
>mixture aside from messing with the control pressure and from my
>experience that is a real hairball.
>Changing the idle mixture will have a minor effect on the mixture once
>the throttle is opened even a small amount. eg. if you change the
>mixture 10% at idle then doubling the airflow (say doubling the idle
>speed) reduces the % change to 5%, with 5 times the airflow the % change
>is only 2%. So, the effect of adjusting idle mixture dies out quickly as
>the throttle is opened.
>Personally, I think your a/f readings are interesting but not indicative
>of a problem.
>Dan
>
>Cory Langford wrote:
>> 
>> Okay, I have small conundrum I am working on and maybe someone here can
>> throw some info at me to help out :)
>> 
>> I installed a cheap autometer air/fuel meter into the '79 with a 1 wire o2
>> sensor.  At start up everything seems normal. I get a rich reading, as I
>> expected due to the cold start injector kicking in.
>> 
>> When it is warm and under load it runs just shy or rich.
>> 
>> What I have noticed is that when I am simply cruising along a 2,0000-2,500
>> rpm and the engine has no real load, it leans out right to the end of the
>> scale.
>> 
>> Step on the gas, back up to stoic just before rich.
>> 
>> I can see it getting lean when you take your foot off the gas as engine
>> winds down, but once at a steady rpm I thought it should go back to stoic
>> again.
>> 
>> I am going to try and richen the mixture a bit, but I can't seem to think
>> how to get it richer just at the lower rpms (unless I am thinking wrong
>> here) with out richening out the upper rpm range.
>> 
>> Any ideas?
>> 
>> Thanks
>> 
>> Cory Langford
>> '86 turbo project - running, just needs tuning :)
>> '79 daily driver - Restore in progress...
>> '65 Ghia - The next project in the garage
>> 
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