[DML] Re: 3 Brass Screws Infront Of Engine

["stainlessilusion" <5n-@xxxxxxx>]

I stand corrected; I added this information going by the volvo CIS
manual that I read long ago. It's in the volvo system that the idle
speed motor increases the idle speed during A/Cload for increased
power as well as increase cooling (Radiator/condensor located in front
of engine).  At the time for some reason I was thinking it was the
same on the DeLorean. Thank you for the correction...My apologies!
-----dani b. #5003

>
>
> Errrm.... almost entirely inaccurate I'm afraid...
> 
> The idlespeed system is a closed-loop system and is designed to keep
the 
> idle constant regardless of temperature or load, so when the fans kick 
> on, you may well see a sudden drop in RPM followed by it picking
back up 
> again to 850 plus-or-minus 25 (ignore the rev counter, it's not that 
> accurate). Adjusting the brass screws may allow too much air in if you 
> keep going to beyond the point where the idlespeed motor can
compensate, 
> although taking it up to this threshold can be beneficial. You won't 
> create mixture problems because the air passing through the "screws" is 
> metered, unless you back them off so far that you create a vacuum leak.
> 
> A quirk of the system is that a rich running engine sends the idlespeed 
> into oscillation - a condition experienced on a cold engine with lambda 
> (original, in other words)
> 
> Martin
> 
> stainlessilusion wrote:
> 
> >As a side note:
> >The idle speed motor regulates the amount of air going into the
> >engine, thats why when your cooling fans kick on- your engine revs
> >higher to compensate for the increased power draw (Increasing
> >air=Increased RPMS=More power from alternator)-the idle motor adjusts
> >allowing additional air to increase the RPMS. Adjusting the screws
> >with the idle motor will possibly allow too much air, which will
> >eventually lead to mixture problems depending on how much extra air it
> >is getting.
> >  
> >
>








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