[DML] Re: Missing idle mixture screw?
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[DML] Re: Missing idle mixture screw?



That hole is supposed to be kept closed except when actually adjusting
the mixture screw after which you MUST reclose the hole and measure
emmisions again. It is not exactly an IDLE mixture screw, it affects
the mixture across the entire RPM range. It is only adjusted at idle.
Your problem *could* be a dirty/bad injector. Or a vacuum leak
possibly  including the seals on the fuel injectors. The mixture screw
is a metric allen screw (I think 3mm) and it is probably in there.
Make sure the frequency valve buzzes, even at idle before you try
adjusting the mixture. The mixture screw is VERY sensitive. It takes
only a little bit of a turn to mess up your emmisions. Generaly it is
best to leave it alone and fix the problem that causes you to fail,
not try to adjust it to fix it.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "vin4258" <vin4258@xxxx> wrote:
>
> Vin 4258 failed emissions a few weeks ago and after doing a tune up 
> (plugs, wires, cap, rotor, air filter, oil) it failed again today with 
> only minimil improvement.  Emissions tester says he thinks the O2 
> sensor is ok because emission levels pass at high RPM (the 
> sensor 'kicks in' at a higher RPM but does not affect idle mixture?)  
> Next option is to adust the idle mixture screw, but when I go looking 
> for it, it seems to be missing.  All I see is a hole with no apparent 
> end but I do see threads.  What is this and can I simply put in a 
> 







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