Quote:
Originally Posted by jfoj
This is not likely an O2 sensor issue, trust me.
If you are only using Torque Free, move on from Torque Free and spend the $3.99 and buy OBDFusion, it is far better than Torque Pro as far as I am concerned.
I need to see Freeze Frame data Logged data will tell me WAY more than you can convey.
This problem is likely a Lean problem which will be clearly shown with the data.
Lean conditions are more often than not due to vacuum and/or crankcase air leaks. Occasionally a soft failing fuel pump could be an issue as well.
For vacuum or crankcase air leaks, smoke testing is the easiest way to figure out if and where a leak is.
Here some examples of ways to smoke test:
https://www.youtube.com/watch?v=AsgB9eBl58I
https://www.youtube.com/watch?v=PnU-SY6egr4
https://www.youtube.com/watch?v=zMok2y05jNE
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The system was in closed loop, but it went to open loop
How can you say that it is not a 02 sensor issue? Since he has the app torque I would suggest the OP monitor the 02 sensor voltages for ALL of the Sensors.
The sensor that the OP posted is for the post cat 02 (B1S2) sensor, you need to post the 02 B1S1 and 02 B2S1 voltage readings as that is what is used by the DME to control the engine.
Short term fuel trim will tell you if the engine is running lean. If the fuel trims are in the plus range that mean the DME is commanding the system to add fuel. Fuel trim numbers will have to be over 10% for a lean condition.