4k 5+5-fuel mixture adjustment then no cold start

[Ti Kan]

Archibald, Jon writes:
> This car was running so rich, it had completely fouled the spark plugs.
> After cleaning the plugs and turning the mixture screw until the black smoke
> subsided, the car ran great, idled at the right speed, etc, and started 4
> times with no problem. I let the car sit for about an hour and a half, then
> tried to re-start. Nothing. Could leaning out the mixture control at the
> sensor plate really render the car un-startable? I tried turning it back to
> the rich-side, but still no go. I'm stumped.

Is your oxygen sensor working?  A warm engine may run with a marginal
O2 sensor and the basic mixture set way-lean, but it will probably not
start cold when the system is running open-loop.

Try richening the basic mixture and get the car started, then run it
until full operating temps is reached.  Then, disconnect your O2 sensor
and measure its output voltage.  Vary the basic mixture to see if
the voltage responds accordingly.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
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