2011 Mustang 5.0 issue with Open Loop all the time

Hello, a little feedback of the car. It's fully bolt ons with LT headers, X-Pipe and cat-back, JLT CAI, 18 Intake manifold. When we tune it first time it was ok switching between OP and CL loops with no issue. After awhile when we return it to the stock manifolds and tune the MAF curve we figured out during the datalog the car running Open loop all the time and never switched to CL loop and we found that LTFT B1 and B2 stays at 1.00 for long time and then start to read.

So, why it is reading OP loop all the time? is it an issue with Upstream O2 sensors or faulty Injectors or something else?

I know that we can force it to open loop from the SCT Advantage software but we didn't tuch it at all.

I will apprecite if someone faced same issue to share his experience with this issue and how to solve it.

this forum is more generic tuning ?s

for more in depth tuning its prob best to go to EFIDynoTuning • Index page and post there. You should post the tune file too to make sure its not anything in the tune doing it.

Usually if its stuck in open loop its due to an o2 sensor extender. You cant use them on coyotes cuz they run widebands and it throws off the calibration. If you need longer o2s then you need to order some for an f150 which are longer.

Otherwise suspect o2 sensor issues usually.

decipha said:

this forum is more generic tuning ?s

for more in depth tuning its prob best to go to EFIDynoTuning • Index page and post there. You should post the tune file too to make sure its not anything in the tune doing it.

Usually if its stuck in open loop its due to an o2 sensor extender. You cant use them on coyotes cuz they run widebands and it throws off the calibration. If you need longer o2s then you need to order some for an f150 which are longer.

Otherwise suspect o2 sensor issues usually.

Click to expand...

You're right we extend the O2 sensors cables. I think we will order the F150 o2 sensors cable and see if the issue will be fixed.

Thank you Decipha for your usual support.

For sure I will register in your forum and use it for future depth tuning.

Sent from my HUAWEI matte 20 pro