P0171 after intake install

Printable View

September 17th, 2019
andysc3

P0171 after intake install

I have a 2011 Cadillac Escalade that I installed a intake tube and filter a few days ago and now I'm getting a p0171 lean condition. I have verified that there are no leaks and the maf sensor is clean. I did notice that at idle the LTFT was 23-25% at idle but would drop to around 10-13% in park at around 1300-1500rpm. Is there an airflow or fueling table I can adjust to get it closer to where it needs to be so I can drive it. Right now all I've adjusted in the tune was spark, dfco and some afm settings. I'm installing a vvt cam, headers and a wideband next month and will be able to dial in the tune better then. Just need it back to being driveable. Thanks
September 17th, 2019
ScarabEpic22

Need to tune the MAF and/or VVE tables most likely, showing that lean on LTFTs is why the code is being set. No "master" table, you'll need to tune the airflow. If you're planning to do all of those other mods soon, easiest thing would be to put the stock setup back on and tune it all in a few weeks.
September 18th, 2019
andysc3

Thank you. It did end up having a vaccum leak from the hose that goes to the passenger side valve cover.

But it all may end up getting replaced soon as I had gotten the okay to adding a turbo into the mix :anitoof:
Looking at a single 78/75 or 85mm turbo, 80# @ 3bar injectors and dual walbro 450 pumps and swap to a return style fuel system. In the e38 file I see a 2bar and a 3bar chart in I think was the airflow table, dont have my computer with me to verify. Can I install a 3bar sensor and use those to adjust the fueling? I'm so used to the 411pcm with cos3. Was so easy to tune for sd. Are there any write ups or tutorials I can read through while I'm gathering parts?
September 18th, 2019
ScarabEpic22

Quote:

Originally Posted by andysc3

Thank you. It did end up having a vaccum leak from the hose that goes to the passenger side valve cover.

But it all may end up getting replaced soon as I had gotten the okay to adding a turbo into the mix :anitoof:
Looking at a single 78/75 or 85mm turbo, 80# @ 3bar injectors and dual walbro 450 pumps and swap to a return style fuel system. In the e38 file I see a 2bar and a 3bar chart in I think was the airflow table, dont have my computer with me to verify. Can I install a 3bar sensor and use those to adjust the fueling? I'm so used to the 411pcm with cos3. Was so easy to tune for sd. Are there any write ups or tutorials I can read through while I'm gathering parts?

Yes, just install 3 Bar MAP and change the MAP sensor settings to match. Then tune VVE and/or MAF to suit. No COS needed nor will there likely be one for your vehicle. Look at swingtan's VVE tuning tutorial, same principles apply. You will need to change the scaling of the spark tables and use the 3Bar VVE tables.
September 18th, 2019
andysc3

Okay. Thank you for your help.