You know if you open your Tune Tool and have your Scan Tool linked, you can watch in real time what Table both your Spark and Air are coming from.
Definitely looks like Spark was coming from B5933 from your early morning Idle.
How did it run on warm-up?
It ran perfectly this morning. It started easily, and never missed a beat. I haven't driven it yet though. Yesterday morning, I couldn't hardly get it to stay running at all for the first 15-20 seconds. I made quite a few changes to the tune yesterday, so don't know exactly what helped there. I've never had an issue with it just setting there and idling. My issues, other than starting yesterday, have always been related to surging, or falling off and dying when letting off the throttle in gear.
This morning's changes where to bump the Desired Idle Air, according to my RAFPN, and bump the idles areas of High-Octane Spark to be within 3° of my Base Spark In Gear.
Last edited by blsnelling; October 5th, 2010 at 05:45 AM.
I just drove the truck, and it has no hint of surging in the least!
One small nit picky thing I'm noticing. When I come to a stop, it hangs around 900-1000 RPMs, for maybe one second, before falling to the desired idle of 650. What might that be?
Most likely it is B4315, or one of the TF Decay Delays. You can manipulate the 'delay' in seconds until the TF air decays.
While it is always possible it is the TC B4309, you can always test that by just literally zeroing out the entire table, or change B4311, B4312 to a higher speed.
Glad to hear it is running better...
After looking at the tables you mentioned, I bet you it is B4318. Look at the value at 0 MPH, 1.00 seconds, just what I guestimated the delay to be. I'm going to make it .25 in all cells.
Yesterday morning, I logged RAFPN, from 20-93. This morning I logged RAFIG, from 8-92. Both gave nice smooth curves. The only hand-made correction were on the extreme ends where I couldn't log. Is it unheard of to have them cross like this?
I just sent my wife out in the truck to run some errands. She has always hated the way it wants to die at idle, which it did even with the 5.3 and 212/218 cam. She just told me it idles great. No problems at allThanks for the help and tutorials!
Glad to hear it. Same with my wife..she occasionally takes the car into work. That turns a few heads! Hardest part was teaching her to drive a manual.Originally Posted by blsnelling
I just sent my wife out in the truck to run some errands. She has always hated the way it wants to die at idle, which it did even with the 5.3 and 212/218 cam. She just told me it idles great. No problems at all
On your previous question, I am not totally sure of the answer. Common sense might tell me the Airflows do not cross, but I would just try it for a while and see. Try it again on a real cold morning and see what you come up with.
You should see the Idle really settle down after 4-5 starts. You have a few Airflow Learning Parameters that the PCM will continue to learn.
Enjoy your ride..
Would it be wise for me to let it get a couple cold starts/warmups on it before logging RAFPN or RAFIG again? I didn't know if it needed to learn it's trims before logging again or not. As of right now though, it's running great. The tune it has in it right now, is the one with Desired Airflow as above, so the lower RAFIG appears to be sufficient.
Yea, I always like to let the Idle 'settle' before re-logging Airflows. If it is running great, just let at least 3-4 days go by before a re-try. Those values will always differ slightly from day to day. I usually do two RAFIG and MAF Desired Airflows a year. One winter, one summer. I do not think it has budged in over a year.
If it is good, let her ride..
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