AFR's off between banks HELP!

Megan370z · 09-13-2013, 11:14 AM

Quote:

Originally Posted by 12nismo

I have a situation with my AFR's and was hoping I could some thoughts on what the issue might be. I did some data logging last night and found that bank 1 is running almost 1 point leaner than bank 2 under WOT. And when engine braking, bank 1 goes to around 20 while bank 2 goes full lean. I assume this has been going on for some time but have no idea how long. The car hasn't been acting weird in any way other than throwing a P2A00 code which I cleared and hasn't come back. I'm hoping there is no risk of motor damage from this. Attached is a data log showing the problem. It starts out cruising, then goes to WOT, then ends with engine braking.

there is a few possibilities on this such as;

- looser bolt on the headers/cats/testpipe flange which create a leak ( I had this problem 2 years ago.)
- I suggest you to switch those AFR sensor in the opposite bank to see if the problem still remain the same or if the AFR will change by installing the sensor into the other bank.
-IF the sensor appear to be alright from doing what I suggest , its to try to do the same with the MAF sensor
-If nothing work and its always the same, tune your Cylinder compensation with Uprev

I have the whole Bank#2 setup 1.5% more than Bank#1 which gives me the same AFR on both bank.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cipher reading weird AFR's on my car	SS_Firehawk	Tuning	14	06-13-2013 02:16 AM
BBQ Spanish Banks Sunday July 22nd	Sena	Canada	76	07-24-2012 11:16 PM