Things have definitely changed. I didn't touch the MAF except to move it out of the way but my BLM in park was around 128-130 ish now Im up around 138 -140 (a bit lean). I'm not sure at this point how to tweak the BLM's without an adjustable MAF.
Dang car is touchy when it comes to tuning, but it's running really good.
At 138, the ECM made the adjustment, to ensure the car is running close to stoic, and, it is actually no longer running lean.
Remember, BLM is a long term adjustment, so it takes time to get to “the stable number”.
Your Idle BLM appears to what I have been seeing as well (If I recall correctly. :tongue: )
When you remove the filler tube hose, with PCV in place, your BLM’s will increase.
Small vacuum leaks (after the MAF) in other places will make a BIG difference as well, as well as O2 condition, grounds, etc. It all adds up.
You can adjust the BLM’s at idle back down with the FP, BUT, it will change every other fuel parameter.
Some time ago, for a long time, I was in search of the “Magical 128”, which only implies that the ECM is not making an adjustment.
However, that is not a reality. The ECM is designed to adjust the fuel, and that is what it is doing.
Since you are NOT at the edge of the ECM’s ability to make the adjustment, I would not worry too much about it, especially not at idle.
When the weather changes (Temp/Baro/Vapor), the idle BLM will change since the "percent of air change" is MUCH greater at idle than WOT.
I am sure you noticed the difference in performance in the winter vs summer, and it seems that you always need to adjust fuel.
This is why TT developed the 6.0WB chip. (Shameless plug
)
If it is running good, and, there is no KR, I would not worry about it.
