'90 200tqs (MC) Cold start idle stability problem

[Ti Kan]

G. O'Malley writes:
> When I start my car after a long sit (say overnight,
> all day) it won't idle for the first 30 seconds or so.
> 
> The car starts fine, cranks for only 2 seconds and
> catches.  If I don't work the throttle, it will not
> maintain RPM and stall......  I don't notice a miss,
> it just won't maintain RPM.  If I work the gas, it
> runs smooth.  
> 
> After 30 seconds or so (enough time for O2 sensor to
> go closed loop; other?) the idle settles down and the
> car runs great.
> Runs great on warm start

Sounds like you have a cold running enrichment problem.  Maybe the
control pressure regulator (warm up regulator) is at fault, or
the idle stabilizer valve.  Check all intake hoses for leaks etc.

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