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On 8 Sep 2004 at 10:07, wodkowski@mac.com wrote: > Last night I started my car up, and when I turned on the lights noticed > a significant drop in its idle. I'd bet it was as much as 50 rpm > although I didn't have the energy to measure it right then. Turned them > off again and the idle went up. I guess the fuel pump power is being > drained by the lights? > But wouldn't the brain tell it to compensate? Or is the idle a > brain-free operation. These FI systems do not have the sophisticated idle compensation that later systems have. What you're noticing is that the extra load on the generator pulls the idle speed down a bit. This is perfectly normal, and any carbed car would act the same. > Now I do good deal of night driving, more than day driving in fact, so > I'm wondering whether it wouldn't make sense for me to set my idle at > night with the lights on whenever I do a tune-up, and adjust it if I > ever need to make a long daytime road trip. In general, the idle adjustment is there to keep the engine from dying when you take your foot off the pedal. As long as this is the case there's nothing to worry about. Once you are actually driving (ie, no longer at idle) the idle adjustment point is completely irrelevant. So just adjust the idle with the lights off, that's the way it was designed to work, and everything will be fine. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ Shameless link for search engines: http://listarchive.type3.org ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~