What's holding my Idle high?
Here is my current tune. After the car is hot, the idle is running around 950. Not bad, but I have it set for 850. Something is screwing with me and holding my idle up an extra 100 RPM. Any observations that might "set me free"?
My scan file shows that my temp is well up into the operating range but the idle is averaging 950 or so.
tun file http://www.ls2.com/boggs/efilive/102306testtuneac.tun
Elmer
Last edited by eboggs_jkvl; October 26th, 2006 at 08:43 AM.
2014 Corvette Convertible, Torch Red, A6, Z51, 3LT, NPP Exhaust
Ok, what the hell am I doing wrong? I can't get the lnk to work on the tun file. Does the site restrict this from happening?
2014 Corvette Convertible, Torch Red, A6, Z51, 3LT, NPP Exhaust
The link downloaded fine for me. Why is your desired idle airflow so high? Did you log the RAFIG and adjust? Also, why is your learned airflow table zero'd out? The short term correctors look to be adjusting you as best they can. But, there's no learning going on with that table zero'd out I believe.
Try changing the Learned Airflow table (under Idle>Learning) and nothing else. I'd put .007813 in for 40.0rpm, .014648 for 60.0rpm, and .019531 for 80.0rpm on down in both drive tables. See if that helps...
Did what you recommended and the idle is back to 850. However, the stupid surge is back too.
Cold start? Absolutely perfect. Hits and holds rock steady.....
PArk the car, wait about 75 minutes, get in and restart the car... Instant start AND instant hunt for idle to as low as 2-300 rpm, back up to 1100, down to 500, back to 900, down to 700 back to 850 and holds steady. Crap.
2014 Corvette Convertible, Torch Red, A6, Z51, 3LT, NPP Exhaust
Here's my adjusted tune
2014 Corvette Convertible, Torch Red, A6, Z51, 3LT, NPP Exhaust
I haven't looked at your files yet, but what do your AFR and Spark look like at idle? Might want to use the BiDi to optimize the two.
By the time I try the Bi-Di, the stupid thing has stopped acting stupid. It just makes the surge at initial startup and 10 seconds later it knocks the crap off and behaves! It acts like a kid! It just wants to push my buttons!
2014 Corvette Convertible, Torch Red, A6, Z51, 3LT, NPP Exhaust
So, we're making progress....Originally Posted by eboggs_jkvl
Ok, so you made the changes I suggested and only those changes, right? Now, you have a warm hunt for idle after restarts? Ok, keep the changes I suggested and zero out anything you have in your RAM stored values under Idle>Learn>Parameters (B4322, B4323, B4324, B4325, B4328, B4329, B4330, & B4331). I think what's happening on restart is, the PCM is remembering what happened the last time it was running and is using that to guess a starting point. If there's nothing to remember from, that might solve the issue since prior to the change you had idle learning [essentially] disabled. LMK how it works out and if it doesn't, there's one other thing we can try.
Last edited by SSpdDmon; October 27th, 2006 at 07:45 AM.
4322 = 0
4323 = 0
4324 = 3, now 0
4325 = -3, now 0
4328, 4329, 4330, and 4331 do not exist in my tune.
Elmer
2014 Corvette Convertible, Torch Red, A6, Z51, 3LT, NPP Exhaust
Elmer - Not sure if you've seen this thread before, but it may be what you need to get past the lean cold starts http://www.forum.efilive.com/showthread.php?t=3170
Posting Permissions
Reply With Quote