P0171 P0174 Check Engine Light CEL

[racebmwm3]

Update:

We are getting closer.

Today, I got a new VDO/Continental MAF installed. I immediately saw an increase in the new MAF signal vs. the Chinese MAF vs. My original BMW "old' MAF. Now, the MAF shows ~4 g/s at idle vs 2.x-3.x before. Considerable difference. As expected, car feels more dynamic.

Yesterday I had some downtime and I was waiting for the new purge valve anyway, so I cleaned the existing purge valve to see if it would make a difference. I didn't see a big difference.

I still have an issue with STFT, which now has been mostly negative. At load, the STFT becomes closer to normal. You can see the STFT trend up/down at idle times. During idle, the STFT is definitely negative (running rich). I am hoping this is due to the purge valve (new one should be here sometime today) getting stuck open and/or not closing appropriately. Or maybe the car just needs to learn things and will adjust to the correct numbers over some time. After the MAF replacement, I still see the biggest improvement.

[racebmwm3]

Update again:
Got the new purge valve installed. First look ... Numbers look promising. I'm going to drive it for a bit and rescan, but I do not see the typical rise/drop from the STFT at idle that I have been seeing before. Numbers a little off, but maybe car needs to harmonize.

Quick scan....

[80stech]

Did you order an OE BMW purge valve or you gonna "add more to the soup?"

[racebmwm3]

Originally Posted by 80stech

Did you order an OE BMW purge valve or you gonna "add more to the soup?"

It's OE

[andrewwynn]

Reset fuel adaptations or it will take a few drive cycles


Sent from my iPhone using Tapatalk Pro

[racebmwm3]

Originally Posted by andrewwynn

Reset fuel adaptations or it will take a few drive cycles


Sent from my iPhone using Tapatalk Pro

Cool. Will do that now. Going on a long drive.

Thanks!

[80stech]

Hopefully this caps off another steaming pile of andrewwynn BS