hunting idle
Thread Starter
TECH Apprentice
Joined: Nov 2016
Posts: 371
Likes: 18
From: switzerland
hunting idle 99 c5 a4. stock configuration running on cos3 (efilive). starts excellent, idles fine in drive. sometimes hunts/surges idling in p/n (not in open loop, spark is stable), sometimes dies when driving comming off throttle. its been doing this more and more lately. not weather related, as far as i can tell.
where would you start?
i corrected iac effective area and desired air flow to stock (there was not much difference). it didnt surge on start up but that might have been just coincidence, cant drive it now. what else? im looking at everything where drive is different from p/n like learned air flow correction, engine speed compensation (multipier is the same) or rpm set point adjust. direct air flow correction is the same, learned drive limits are the same. stall saver is the same (100 rpm lower) but is zeroed out in original tune.
cracker is the same as in original tune, throttle follower airflow is doubled.
what else?
where would you start?
i corrected iac effective area and desired air flow to stock (there was not much difference). it didnt surge on start up but that might have been just coincidence, cant drive it now. what else? im looking at everything where drive is different from p/n like learned air flow correction, engine speed compensation (multipier is the same) or rpm set point adjust. direct air flow correction is the same, learned drive limits are the same. stall saver is the same (100 rpm lower) but is zeroed out in original tune.
cracker is the same as in original tune, throttle follower airflow is doubled.
what else?
Last edited by Dian; Jan 6, 2023 at 07:08 AM.
Thread Starter
TECH Apprentice
Joined: Nov 2016
Posts: 371
Likes: 18
From: switzerland
nothing really to be seen in the log except rpm fluctuation. also it happens just once in while as mentioned. of course if i would be logging some special pids (which ones?) the problem might show itself.
i dont really want anybody to loose time looking at hundred parameters and maybe even comparing them to an original tune. perhaps somebody has an idea off the bat?
i dont really want anybody to loose time looking at hundred parameters and maybe even comparing them to an original tune. perhaps somebody has an idea off the bat?
