Frustrations set in.. prematurely? (SAME 84 start issue)

[rob]

 I bought a cheap-ish CO meter. I used to trust it implicitly, but over time 
I realised it's a bit inconsistent and that I need to back it up a little 
with actual miles of usage.

 My cars are both plain CIS and being pre '93 emissions targets are set high 
here in the uk, (up to 3.5% CO allowed) so I know this is a different 
scenario to the OP, however it is interesting that three flats CCW from my 
optimum position the car still starts and runs ok(ish), what I notice is 
that there is slightly less urge per comparable throttle opening at lower 
speeds and if I snap the throttle open before the car warms up I can 
sometimes prompt a backfire.

 So three flats (or half a turn) CCW on a plain CIS  seems to be the 
difference between running great and running OK but right on the edge of 
lean.

 Going the other way a similar amount the car continues to run great (as in 
just as good as optimum), but warm starts become hard (need to floor the 
throttle) and fuel consumption plummets.

 So just a few reference points if they are any good to any one.

 Cheers Rob.

----- Original Message ----- 
From: "Huw Powell" <audi at humanspeakers.com>
To: "rob" <rob3 at hod3.fsnet.co.uk>
Cc: "Ed Kellock" <ekellock at gmail.com>; <quattro at audifans.com>
Sent: Tuesday, August 17, 2010 12:24 AM
Subject: Re: Frustrations set in.. prematurely? (SAME 84 start issue)


>
> Also also, between adjustments, remove the tool and blip the throttle 
> before observing measurements.
>
> On 8/16/2010 7:12 PM, rob wrote:
>> That's my recollection too, Huw.
>>
>> Hey that rhymes..
>> ----- Original Message ----- From: "Huw Powell" <audi at humanspeakers.com>
>> To: "Ed Kellock" <ekellock at gmail.com>
>> Cc: "'rob'" <rob3 at hod3.fsnet.co.uk>; <quattro at audifans.com>
>> Sent: Monday, August 16, 2010 11:54 PM
>> Subject: Re: Frustrations set in.. prematurely? (SAME 84 start issue)
>>
>>
>>>
>>> As I recall, it's the opposite of carburetor jet adjustment, ie,
>>> clockwise is richer and CCW is leaner.
>>>
>>> On 8/16/2010 3:40 PM, Ed Kellock wrote:
>>>> In addition, as I recall, or at least maybe just for me, the
>>>> direction of
>>>> adjustment was opposite of what seemed intuitive to me. I think I
>>>> went in
>>>> thinking clockwise was richer and vice versa, but learned that it is 
>>>> the
>>>> other way around due to the mechanical relationship inside.
>>>>
>>>> Ed
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: quattro-bounces at audifans.com
>>>> [mailto:quattro-bounces at audifans.com] On
>>>> Behalf Of rob
>>>> Sent: Monday, August 16, 2010 1:34 PM
>>>> To: quattro at audifans.com
>>>> Subject: Re: Frustrations set in.. prematurely? (SAME 84 start issue)
>>>>
>>>>
>>>>
>>>> In various past situations I've taken the liberty of playing with the
>>>> basic fuelling adjustment (the one that you set with the 3mm allen 
>>>> key),
>>>> just to get a feel for whether I make the problem better or worse by
>>>> leaning
>>>>
>>>> or richening the mix.
>>>>
>>>> Obviously in a lambda situation the system will make adjustments but
>>>> thats
>>>> only in closed loop mode.
>>>>
>>>> You do need to keep track of your adjustments of course otherwise you
>>>> may
>>>> well screw up. I tend to keep a notepad and use a tommy bar allen key
>>>> so as
>>>> I can record e.g. 2nd Jan 3 flats clockwise.. 10 Jan 1 flat
>>>> anticlockwise..
>>>>
>>>> This may work for you or may not, good luck, Rob.
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>
>>> --
>>> Huw Powell
>>>
>>> http://www.humanspeakers.com/audi
>>>
>>> http://www.humanthoughts.org/
>>>
>>
>>
>>
>>
>
> -- 
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
>