open loop, cold idle problems....
Thread Starter
Melting Slicks
Joined: Apr 2001
Posts: 2,099
Likes: 218
From: Ca.
open loop, cold idle problems....
I'd just like to know if anyone else has gone through the same problems-and what worked!!! It wasn't until winter that I ran into this-car cold with outside temps down to 10deg. F. On start up it would idle real low and stall out when you put it in gear and just touch the throttle.
I've gone up and down on the open loop a/f ratio vs. coolant temp with some improvement. Now I've gone to the cool. compensation spark vs. load. It's just frustrating as I can only tune once or twice a day-after it warms up I'll have to let it cool all the way down again to attempt to tune the lower temps! :cry At about 40deg. C coolant temps on up I've got it idling good open loop; it's just the real low temps that I seem to be chasing my tail on lately. (I could just enable the stall saver-but I'm trying to dial it in without that.)
Any input/ experience with this greatly appreciated!!!!
I've gone up and down on the open loop a/f ratio vs. coolant temp with some improvement. Now I've gone to the cool. compensation spark vs. load. It's just frustrating as I can only tune once or twice a day-after it warms up I'll have to let it cool all the way down again to attempt to tune the lower temps! :cry At about 40deg. C coolant temps on up I've got it idling good open loop; it's just the real low temps that I seem to be chasing my tail on lately. (I could just enable the stall saver-but I'm trying to dial it in without that.)
Any input/ experience with this greatly appreciated!!!!
Racer
Joined: Jun 2000
Posts: 469
Likes: 0
From: Norfolk VA
Re: open loop, cold idle problems.... (drive it)
Do you have any log files of the start-up? If so what format? I can rwadf datamaster and diacom. Send me a copy to titan@sybercom.net. I would like to look and see if I can offer any ideas.
Later,
RJ
Later,
RJ
Thread Starter
Melting Slicks
Joined: Apr 2001
Posts: 2,099
Likes: 218
From: Ca.
Re: open loop, cold idle problems.... (HJV11)
I'm using diacom-I'll try to get a log of it later today and send it. Had another thought :eek: I could try using the wideband o2 sensor to get a better idea of cold start a/f ratio; as the stock o2 sensor is useless at first when it's cold. Anyone tried that? How long does a wideband have to have power before it's accurate?
Safety Car
Joined: Mar 2000
Posts: 3,620
Likes: 2
From: Hillsboro OR
Re: open loop, cold idle problems.... (drive it)
Have you tried fiddling with the idle rpm ? Are you using the 89 programming ? If you are, send me your bin file and I'll take a look at it. Whats the specs on the cam your running ?
Thread Starter
Melting Slicks
Joined: Apr 2001
Posts: 2,099
Likes: 218
From: Ca.
Re: open loop, cold idle problems.... (AquaMetallic94LT1)
Have you tried fiddling with the idle rpm ? Are you using the 89 programming ? If you are, send me your bin file and I'll take a look at it. Whats the specs on the cam your running ?
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
Re: open loop, cold idle problems.... (drive it)
This may not help, but look at your IAC count. Possibly set the minimum idle air. (or minimum air idle, wich ever it is called) It helped alot on my 92 (aftermarket cam based on an LT4 hot cam). It would idle super low while in gear and cold. I noticed that the IAC count was at 160. I opened the throttle plates alittle and this helped me. You are probably 10 steps ahead, but this is all I can offer for now. Good Luck!!
Thread Starter
Melting Slicks
Joined: Apr 2001
Posts: 2,099
Likes: 218
From: Ca.
Re: open loop, cold idle problems.... (ANTI VENOM)
Yup, already adjusted it so the iac's about 20 to 30 warm at idle. Just an update-at lower altitude (about 1500ft) at idle the vac is 16! Always knew there was a diff. but its been a long time since I did a comparison and didn't realize it could be this much a diff. Just makes tuning more fun! :eek:
