Re: [DML] Re: Volvo F Series CO Values

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

With advance apologies for replying to a fairly old message, I have been 
prompted to look back at "endotex23"'s posts and so far have been 
imressed. I just wanted to drop a little info based on your last comment 
in this post

endotex23 wrote:

> I'm guessing 
>if you look more closely at that procedure you'll find it requires 
>the Lambda system to be disabled. This is usually done by 
>disconnecting the oxygen sensor on an OBD 1 or earlier vehicle so 
>equipped.
>  
>
FYI under warm-up conditions, lambda sensor disconnected, and, 
crucially, *when the full throttle microswitch is pressed* all have 
exactly the same effect, electrically speaking. This assumes your full 
throttle switch is working...

However, I have to stick up for Bill here - all the B28F's I've ever put 
on an analyser with lambda system working work at around 1% CO. And I 
have the luxury of servicing a large number of D's without catalytic 
convertors. I too have access to a different set of manuals - 
specifically the Renault K-Jet manual which also tells the same story 
for the Swiss Emissions controlled version of the Renault 30. The 
mixture screw does nothing more than adjust the offset of the fuelling 
graph - ie the "C" in the Y=Mx+C and has little or no effect, 
proportinally speaking, higher in the rev range where the cat is working 
hardest. I'd also invite you to see what the CO does at idle when the 
full throttle switch is pressed. I think you'll be surprised to see the 
CO skyrocket to a level that would fail an emissions test in the UK, let 
alone California!

Martin
DMUK





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