[DML] Re: Volvo F Series CO Values

["content22207" <brobertson@xxxxxxxxxxxx>]

I'm looking right at a Volvo factory manual (CI Fuel System, B27 B28 E/F):

Page 102:

"Check CO content

B27F   1976               1.4-2.0%
       1977 USA Calif     .04-1.0%
       1977 USA Fed       .07-1.3%
       1977 Canada        1.4-2.0%
       1978-1979          .07-1.3%
B28F   1980-1982          .07-1.3%"

I'll try to get it scanned tomorrow.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "endotex23" <endotex23@xxxx> wrote:
> 
> 
> 
> 
> > - Lambda was left unchanged (.7 to 1.3% CO is Volvo F spec)<
> 
> While I normally ignore much of the huge amounts of wrong information 
> on the list I couldn't let this one pass. Any properly functioning 
> Lambda system will not allow this high a CO content. The value 
> mentioned is for set up of primary mixture in open loop. Any CO of 1% 
> or higher will leave a cat converter O2 starved and unable to 
> function. Put any decent gas analyzer on a Delorean and if you see CO 
> anywhere near that level you have problems. Put a 4 or 5 gas NDIR 
> optical bench on it and you can see where the problem lies. The 
> Delorean doesn't need EGR because it's NOx values fall within limits 
> for that year as long as the engine operates at the correct 
> combustion temperatures.
> 
> As an emissions tech I'm continually surprised at how poorly people 
> understand emission controls on any car, even a car whose controls 
> are as simple as this one. Pre-OBD I cars like the Delorean are easy 
> to tune and should always maintain a Lambda of 1 during operation 
> other than transient conditions, cold enrichment or WOT if everything 
> is working correctly. It's mathematically impossible to have a Lambda 
> of 1 with a CO content of .7% and if you see that during closed loop 
> something is wrong. You should never adjust the mixture screw during 
> closed loop because you're wasting your time. All you'll do is push 
> the mixture outside the operating window of the emission control 
> system with resulting damage to the converter and increased 
> emissions. As an aside if you decide to defeat the system and set 
> mixture for best power you need to remove the converter.








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