iCollectStraws

On a relatively stock D16Z6, I see a lot of threads that talk about the 800rpm range for idling once warm and mine idles at 500rpm. Reason I bring this up is when I have the headlights on after the car's warmed up it will idle at 600rpm then drop so low sometimes that the car begins to vibrate and the lights dim. Then it will return to 600rpm or occasionally bounce between 500 and 800 rpm for a little bit before returning to a steady idle at 600. Am I idling too low or is there a bigger issue here?
It's not a constant thing, happens at every other stop or so and only with the headlights on, I don't know if it does it with the A/C on cause I usually don't use the A/C.

93egSLEEPER

you should sit anywhere from 500 to 800. its normal for the idle to drop when it has power draws (headlights, heater ac etc) due to the charging system being under strain. if it goes so low turn up the idle screw on the TB so it is not to high, but when it has power draws it doesnt drop too low.

dohcdelsol

650 + or - 50rpms per sticker under the hood for stock 92 z6 engine

iCollectStraws

Alright I'll try adjusting the idle a little and see if the vibration cuts back a bit, but when it has a bouncing idle that can't be normal, even with the charging system under more load. It didn't ever do that before.

landon.alder

clean your iacv, it might help. Also check your fitv.