Poor Cold Idle (Yes I searched)
#17
There's a thread around here about disabling the egr bit (i think its faa bit 11) and cold idle. If you log it you will see that it switches over at 154.4*F then it will idle fine.
#19
I have had the same problems also either with faa bit 11, or with the new EGR disable routine... both have the same effect on old start warm up... I just see it as a "feature" now...
#20
Disabling bit 11 causes the condition (I'm sure you already know this). I don't think anyone has found a table that will fix it though, with the bit disabled. I know I went through every table in ecuflash trying to fix it to no avail, until I reenabled the bit and it worked.
#22
Also just did some logging and I am getting a rich start condition when the car is warm also... it idles at 13.1 until the coolant temp comes back up to 199.4* then you can see inector pulse width and duty cycle drop and it idles perfect at 14.7....
#23
What coolant temp are you logging? I logged coolant temp scaled (evoscan) and it was always at 154.4*. The second it hit that my rpm jumped up for a second, settled out, and then the car idled perfectly from then on. Even if I did a warm start and coolant temp was less than that it idled crappy until it heated back up past it. Although it did seem to get progressively better as it warmed up.
#24
What coolant temp are you logging? I logged coolant temp scaled (evoscan) and it was always at 154.4*. The second it hit that my rpm jumped up for a second, settled out, and then the car idled perfectly from then on. Even if I did a warm start and coolant temp was less than that it idled crappy until it heated back up past it. Although it did seem to get progressively better as it warmed up.
#27
^^^Yes... it is all coolant temp based in my assumption... Isn't the ECU in open loop at start up? Then when the temp reaches a certain temperature it goes into closed loop?
#28
#29
#30
The other thing to check is if you have scaled your MAF down at all. I think this plays a part in the warm-up fueling also even if it is perfect once warm.
The interesting thing was that when i did this my scaling went to an almost-perfect expected value (~1150*.7(ecuflash scaling)*.7(e85)). I lowered the latencies quite a bit, but you may not need as drastic of a change.
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I also noticed in my case that it was right around a certain coolant temp that it would go from bad to good. Can't remember where off the top of my head though.