First Idle Log...Share Your Wisdom Please!

[ty92dsm]

my first idle log, wondering what could be changed....i cant seem to get the idle to stay steady is my only problem.
thanks!

 

[snowborder714]

1. Watch this video to help you get your AirflowPerRev value in check, and then to get the CombinedFT value set.
http://www.ecmtuning.com/demos/fueltrim.html

2. Run through this to get your TPS values set properly.
v3tpsadj [ECMTuning - wiki]

3. Change the following values.

ALS/Knock tab, under Knock Sensor Control
2500 RPM
25%

Dash
Knock CEL - 2


After you do those things and get your fuel trims in check, post up another idle log.

 

[twdorris]

Your ISC is practically "bottomed out". ISC Position reads nearly zero the whole time, meaning the ECU has very little control over idle at the moment.

You need to determine if your ISC is even working. Try screwing the BISS in more. This should drop idle speed but the ECU should counter by increasing ISC position to maintain the same target (around 800 RPM). If you see this happening, great, keep going until ISC position hoovers around 30 or so.

But if you see idle speed drop even though the ECU is cranking up ISC position, then that probably means the ECU does not have proper control over the ISC motor. Either a blown driver inside the ECU or a bad ISC coil or both.

AirflowPerRev is already higher than expected in your logs (0.31 compared to an expected value of 0.25-0.28). But combined fuel trim is also very positive, meaning despite the higher than normal airflow value, the ECU is still trying to increase the amount of fuel being delivered. So I would focus on getting combined fuel trim dialed in using deadtime adjustments. Try increasing deadtime on the fuel tab while you're logging combined fuel trim at idle until you get combined fuel trim down in the +/- 5% range or so.

In addition to the fuel trim video Brian linked to above, the initial setup video is also worth watching.

Thomas Dorris

 

[KeelesKustome]

^^
I had the same problem, once i diled in the above mention FT's it also fixed my idle. This is good information, if you use it correctly, your problem should be fixed.

 

[ty92dsm]

thanks for the replies guys!...im not going to get to work on it tonight but I will make some changes tomorrow and then post another log. my biss is all the way in and I know the drivers are fine so im thinking the ISC is bad.
Thanks again for the help

 

[ty92dsm]

ok so i just started my car and started making some adjustments, i got my airflowperrev around .25-.28 so then i went to messing with deadtimes to get my combinedFT down, as soon as i adjusted the deadtime my combinedFT went to zero and i cant get it to go anywhere, my wideband is also reeading all the way leaned out??? please help

 

[KeelesKustome]

Explain your problem a little more, I 'm confused when you say it won't go anywhere. What will not go anywhere?