[DML] Emissions

["vin4258" <vin4258@xxxxxxxxxxxx>]

Wonderful news in that vin 4258 failed its emissions idle test.  
Readings at 686 RPM were 289 for HC and 4.25 for CO% when 220 and 1.2 
are legal limits respectively.  I have read through my tech service 
manual and it says that I don't want to adjust the idle mixture screws 
since they are factory set and don't need subsequent adjustment.  So, 
where should I start- is this easy as an air filter change (it 
probably needs one) or is it the cold start valve or thermotime 
switch, or a new direction completely.  BTW the same readings were 72 
HC and .8 CO% at the high speed test (2378 RPM) which passed.

Any thoughts?







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