Still having rolling idle/idle surge problems.

Reply #30 – May 15, 2013, 10:09:02 PM

i saved this thread because i always suspected i could do better in the idle department.
My 20th did not sway up and down, it was a nice steady 650rpm with nothing on.

today i reviewed this thread, did a little thinking about how my car feels with lights on, ac on or other stuff on and seem to notice that the idle is lower sounding *especially* as soon as i put it in drive.

i went out and started the car,
observed my car revs up to about 1100rpm till warm up then it rolls down to about 650-700 (ish)
like normal, the rpms go lower with added loads.

with all the loads added or turned on, i adjusted my idle to about 800.
i turned off my loads and the idle went up to about 1k then i observed the car attempting to drop the base idle down
i shut off the car thinking i will do a couple restarts to see if the EEC starts to learn something.

i shut down and restarted 5 times, during each restart i added and removed loads.
after a couple trips up front to back off or add on a smidge of a turn on the idle screw this way and that... i now have a car that will hold 750rpm with a lot of loads or not.

I dont experience that annoying audible drop in engine rpm or struggle i use to get when i turned on my headlamps or turned on the AC.

seems a lot more correct now.

so the two things i used to guage my idle setting where hi beams on and AC running on hi

i noticed that there is a large period of adjustment within the idle screw which will still allow the eec to control the idel/fuel delivery ect.
if you stay in this goldielocks zone and adjust more on the high side , the cars EEC is able to tolerate your adjustment and still back down the idle to a nominal rpm.

if you go over the goldilocks zone, the eec cant roll the rpms down, so you want to be on the upper edge.
To be honest, now when i add loads, i dont feel like my alternator is struggling as much either. Im sure this probably reduces current draws on various gear in the car as well.

just my added info to this great topic!!!
thanks guys